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This commit is contained in:
krahets
parent
c641987cd8
commit
eda4539790
8 changed files with 212 additions and 212 deletions
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@ -872,77 +872,77 @@ comments: true
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def __init__(self):
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"""构造方法"""
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self.__capacity: int = 10 # 列表容量
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self.__arr: list[int] = [0] * self.__capacity # 数组（存储列表元素）
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self.__size: int = 0 # 列表长度（即当前元素数量）
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self.__extend_ratio: int = 2 # 每次列表扩容的倍数
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self._capacity: int = 10 # 列表容量
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self._arr: list[int] = [0] * self._capacity # 数组（存储列表元素）
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self._size: int = 0 # 列表长度（即当前元素数量）
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self._extend_ratio: int = 2 # 每次列表扩容的倍数
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def size(self) -> int:
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"""获取列表长度（即当前元素数量）"""
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return self.__size
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return self._size
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def capacity(self) -> int:
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"""获取列表容量"""
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return self.__capacity
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return self._capacity
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def get(self, index: int) -> int:
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"""访问元素"""
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# 索引如果越界则抛出异常，下同
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if index < 0 or index >= self.__size:
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if index < 0 or index >= self._size:
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raise IndexError("索引越界")
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return self.__arr[index]
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return self._arr[index]
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def set(self, num: int, index: int):
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"""更新元素"""
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if index < 0 or index >= self.__size:
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if index < 0 or index >= self._size:
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raise IndexError("索引越界")
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self.__arr[index] = num
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self._arr[index] = num
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def add(self, num: int):
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"""尾部添加元素"""
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# 元素数量超出容量时，触发扩容机制
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if self.size() == self.capacity():
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self.extend_capacity()
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self.__arr[self.__size] = num
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self.__size += 1
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self._arr[self._size] = num
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self._size += 1
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def insert(self, num: int, index: int):
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"""中间插入元素"""
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if index < 0 or index >= self.__size:
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if index < 0 or index >= self._size:
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raise IndexError("索引越界")
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# 元素数量超出容量时，触发扩容机制
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if self.__size == self.capacity():
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if self._size == self.capacity():
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self.extend_capacity()
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# 将索引 index 以及之后的元素都向后移动一位
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for j in range(self.__size - 1, index - 1, -1):
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self.__arr[j + 1] = self.__arr[j]
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self.__arr[index] = num
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for j in range(self._size - 1, index - 1, -1):
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self._arr[j + 1] = self._arr[j]
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self._arr[index] = num
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# 更新元素数量
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self.__size += 1
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self._size += 1
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def remove(self, index: int) -> int:
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"""删除元素"""
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if index < 0 or index >= self.__size:
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if index < 0 or index >= self._size:
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raise IndexError("索引越界")
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num = self.__arr[index]
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num = self._arr[index]
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# 索引 i 之后的元素都向前移动一位
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for j in range(index, self.__size - 1):
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self.__arr[j] = self.__arr[j + 1]
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for j in range(index, self._size - 1):
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self._arr[j] = self._arr[j + 1]
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# 更新元素数量
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self.__size -= 1
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self._size -= 1
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# 返回被删除元素
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return num
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def extend_capacity(self):
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"""列表扩容"""
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# 新建一个长度为原数组 __extend_ratio 倍的新数组，并将原数组拷贝到新数组
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self.__arr = self.__arr + [0] * self.capacity() * (self.__extend_ratio - 1)
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self._arr = self._arr + [0] * self.capacity() * (self._extend_ratio - 1)
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# 更新列表容量
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self.__capacity = len(self.__arr)
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self._capacity = len(self._arr)
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def to_array(self) -> list[int]:
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"""返回有效长度的列表"""
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return self.__arr[: self.__size]
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return self._arr[: self._size]
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```
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=== "C++"
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@ -122,8 +122,8 @@ $$
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if i < 0 or j < 0:
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return inf
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# 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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left = min_path_sum_dfs(grid, i - 1, j)
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up = min_path_sum_dfs(grid, i, j - 1)
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up = min_path_sum_dfs(grid, i - 1, j)
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left = min_path_sum_dfs(grid, i, j - 1)
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# 返回从左上角到 (i, j) 的最小路径代价
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return min(left, up) + grid[i][j]
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```
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@ -142,8 +142,8 @@ $$
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return INT_MAX;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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int left = minPathSumDFS(grid, i - 1, j);
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int up = minPathSumDFS(grid, i, j - 1);
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int up = minPathSumDFS(grid, i - 1, j);
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int left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
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}
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@ -163,8 +163,8 @@ $$
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return Integer.MAX_VALUE;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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int left = minPathSumDFS(grid, i - 1, j);
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int up = minPathSumDFS(grid, i, j - 1);
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int up = minPathSumDFS(grid, i - 1, j);
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int left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return Math.min(left, up) + grid[i][j];
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}
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@ -184,8 +184,8 @@ $$
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return int.MaxValue;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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int left = MinPathSumDFS(grid, i - 1, j);
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int up = MinPathSumDFS(grid, i, j - 1);
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int up = MinPathSumDFS(grid, i - 1, j);
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int left = MinPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return Math.Min(left, up) + grid[i][j];
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}
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@ -205,8 +205,8 @@ $$
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return math.MaxInt
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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left := minPathSumDFS(grid, i-1, j)
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up := minPathSumDFS(grid, i, j-1)
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up := minPathSumDFS(grid, i-1, j)
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left := minPathSumDFS(grid, i, j-1)
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// 返回从左上角到 (i, j) 的最小路径代价
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return int(math.Min(float64(left), float64(up))) + grid[i][j]
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}
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@ -226,8 +226,8 @@ $$
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return .max
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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let left = minPathSumDFS(grid: grid, i: i - 1, j: j)
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let up = minPathSumDFS(grid: grid, i: i, j: j - 1)
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let up = minPathSumDFS(grid: grid, i: i - 1, j: j)
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let left = minPathSumDFS(grid: grid, i: i, j: j - 1)
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// 返回从左上角到 (i, j) 的最小路径代价
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return min(left, up) + grid[i][j]
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}
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@ -247,8 +247,8 @@ $$
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return Infinity;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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const left = minPathSumDFS(grid, i - 1, j);
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const up = minPathSumDFS(grid, i, j - 1);
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const up = minPathSumDFS(grid, i - 1, j);
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const left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return Math.min(left, up) + grid[i][j];
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}
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@ -272,8 +272,8 @@ $$
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return Infinity;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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const left = minPathSumDFS(grid, i - 1, j);
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const up = minPathSumDFS(grid, i, j - 1);
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const up = minPathSumDFS(grid, i - 1, j);
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const left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return Math.min(left, up) + grid[i][j];
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}
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@ -294,8 +294,8 @@ $$
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return BigInt.from(2).pow(31).toInt();
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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int left = minPathSumDFS(grid, i - 1, j);
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int up = minPathSumDFS(grid, i, j - 1);
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int up = minPathSumDFS(grid, i - 1, j);
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int left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return min(left, up) + grid[i][j];
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}
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@ -315,8 +315,8 @@ $$
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return i32::MAX;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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let left = min_path_sum_dfs(grid, i - 1, j);
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let up = min_path_sum_dfs(grid, i, j - 1);
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let up = min_path_sum_dfs(grid, i - 1, j);
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let left = min_path_sum_dfs(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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std::cmp::min(left, up) + grid[i as usize][j as usize]
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}
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@ -336,8 +336,8 @@ $$
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return INT_MAX;
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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int left = minPathSumDFS(gridCols, grid, i - 1, j);
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int up = minPathSumDFS(gridCols, grid, i, j - 1);
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int up = minPathSumDFS(gridCols, grid, i - 1, j);
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int left = minPathSumDFS(gridCols, grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
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}
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@ -357,8 +357,8 @@ $$
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return std.math.maxInt(i32);
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}
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// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
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var left = minPathSumDFS(grid, i - 1, j);
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var up = minPathSumDFS(grid, i, j - 1);
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var up = minPathSumDFS(grid, i - 1, j);
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var left = minPathSumDFS(grid, i, j - 1);
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// 返回从左上角到 (i, j) 的最小路径代价
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return @min(left, up) + grid[@as(usize, @intCast(i))][@as(usize, @intCast(j))];
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}
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@ -395,8 +395,8 @@ $$
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if mem[i][j] != -1:
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return mem[i][j]
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# 左边和上边单元格的最小路径代价
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left = min_path_sum_dfs_mem(grid, mem, i - 1, j)
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up = min_path_sum_dfs_mem(grid, mem, i, j - 1)
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up = min_path_sum_dfs_mem(grid, mem, i - 1, j)
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left = min_path_sum_dfs_mem(grid, mem, i, j - 1)
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# 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = min(left, up) + grid[i][j]
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return mem[i][j]
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@ -420,8 +420,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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int left = minPathSumDFSMem(grid, mem, i - 1, j);
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int up = minPathSumDFSMem(grid, mem, i, j - 1);
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int up = minPathSumDFSMem(grid, mem, i - 1, j);
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int left = minPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
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return mem[i][j];
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@ -446,8 +446,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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int left = minPathSumDFSMem(grid, mem, i - 1, j);
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int up = minPathSumDFSMem(grid, mem, i, j - 1);
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int up = minPathSumDFSMem(grid, mem, i - 1, j);
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int left = minPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = Math.min(left, up) + grid[i][j];
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return mem[i][j];
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@ -472,8 +472,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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int left = MinPathSumDFSMem(grid, mem, i - 1, j);
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int up = MinPathSumDFSMem(grid, mem, i, j - 1);
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int up = MinPathSumDFSMem(grid, mem, i - 1, j);
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int left = MinPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = Math.Min(left, up) + grid[i][j];
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return mem[i][j];
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@ -498,8 +498,8 @@ $$
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return mem[i][j]
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}
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// 左边和上边单元格的最小路径代价
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left := minPathSumDFSMem(grid, mem, i-1, j)
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up := minPathSumDFSMem(grid, mem, i, j-1)
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up := minPathSumDFSMem(grid, mem, i-1, j)
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left := minPathSumDFSMem(grid, mem, i, j-1)
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = int(math.Min(float64(left), float64(up))) + grid[i][j]
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return mem[i][j]
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@ -524,8 +524,8 @@ $$
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return mem[i][j]
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}
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// 左边和上边单元格的最小路径代价
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let left = minPathSumDFSMem(grid: grid, mem: &mem, i: i - 1, j: j)
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let up = minPathSumDFSMem(grid: grid, mem: &mem, i: i, j: j - 1)
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let up = minPathSumDFSMem(grid: grid, mem: &mem, i: i - 1, j: j)
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let left = minPathSumDFSMem(grid: grid, mem: &mem, i: i, j: j - 1)
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = min(left, up) + grid[i][j]
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return mem[i][j]
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@ -550,8 +550,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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const left = minPathSumDFSMem(grid, mem, i - 1, j);
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const up = minPathSumDFSMem(grid, mem, i, j - 1);
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const up = minPathSumDFSMem(grid, mem, i - 1, j);
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const left = minPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = Math.min(left, up) + grid[i][j];
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return mem[i][j];
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@ -581,8 +581,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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const left = minPathSumDFSMem(grid, mem, i - 1, j);
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const up = minPathSumDFSMem(grid, mem, i, j - 1);
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const up = minPathSumDFSMem(grid, mem, i - 1, j);
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const left = minPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = Math.min(left, up) + grid[i][j];
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return mem[i][j];
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@ -608,8 +608,8 @@ $$
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return mem[i][j];
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}
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// 左边和上边单元格的最小路径代价
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int left = minPathSumDFSMem(grid, mem, i - 1, j);
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int up = minPathSumDFSMem(grid, mem, i, j - 1);
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int up = minPathSumDFSMem(grid, mem, i - 1, j);
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int left = minPathSumDFSMem(grid, mem, i, j - 1);
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// 记录并返回左上角到 (i, j) 的最小路径代价
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mem[i][j] = min(left, up) + grid[i][j];
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return mem[i][j];
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@ -634,8 +634,8 @@ $$
|
|||
return mem[i as usize][j as usize];
|
||||
}
|
||||
// 左边和上边单元格的最小路径代价
|
||||
let left = min_path_sum_dfs_mem(grid, mem, i - 1, j);
|
||||
let up = min_path_sum_dfs_mem(grid, mem, i, j - 1);
|
||||
let up = min_path_sum_dfs_mem(grid, mem, i - 1, j);
|
||||
let left = min_path_sum_dfs_mem(grid, mem, i, j - 1);
|
||||
// 记录并返回左上角到 (i, j) 的最小路径代价
|
||||
mem[i as usize][j as usize] = std::cmp::min(left, up) + grid[i as usize][j as usize];
|
||||
mem[i as usize][j as usize]
|
||||
|
|
@ -660,8 +660,8 @@ $$
|
|||
return mem[i][j];
|
||||
}
|
||||
// 左边和上边单元格的最小路径代价
|
||||
int left = minPathSumDFSMem(gridCols, grid, mem, i - 1, j);
|
||||
int up = minPathSumDFSMem(gridCols, grid, mem, i, j - 1);
|
||||
int up = minPathSumDFSMem(gridCols, grid, mem, i - 1, j);
|
||||
int left = minPathSumDFSMem(gridCols, grid, mem, i, j - 1);
|
||||
// 记录并返回左上角到 (i, j) 的最小路径代价
|
||||
mem[i][j] = min(left, up) != INT_MAX ? min(left, up) + grid[i][j] : INT_MAX;
|
||||
return mem[i][j];
|
||||
|
|
@ -686,8 +686,8 @@ $$
|
|||
return mem[@as(usize, @intCast(i))][@as(usize, @intCast(j))];
|
||||
}
|
||||
// 计算从左上角到 (i-1, j) 和 (i, j-1) 的最小路径代价
|
||||
var left = minPathSumDFSMem(grid, mem, i - 1, j);
|
||||
var up = minPathSumDFSMem(grid, mem, i, j - 1);
|
||||
var up = minPathSumDFSMem(grid, mem, i - 1, j);
|
||||
var left = minPathSumDFSMem(grid, mem, i, j - 1);
|
||||
// 返回从左上角到 (i, j) 的最小路径代价
|
||||
// 记录并返回左上角到 (i, j) 的最小路径代价
|
||||
mem[@as(usize, @intCast(i))][@as(usize, @intCast(j))] = @min(left, up) + grid[@as(usize, @intCast(i))][@as(usize, @intCast(j))];
|
||||
|
|
|
|||
|
|
@ -400,13 +400,13 @@ comments: true
|
|||
|
||||
def __init__(self):
|
||||
"""构造方法"""
|
||||
self.front: ListNode | None = None # 头节点 front
|
||||
self.rear: ListNode | None = None # 尾节点 rear
|
||||
self.__size: int = 0 # 双向队列的长度
|
||||
self._front: ListNode | None = None # 头节点 front
|
||||
self._rear: ListNode | None = None # 尾节点 rear
|
||||
self._size: int = 0 # 双向队列的长度
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取双向队列的长度"""
|
||||
return self.__size
|
||||
return self._size
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断双向队列是否为空"""
|
||||
|
|
@ -417,20 +417,20 @@ comments: true
|
|||
node = ListNode(num)
|
||||
# 若链表为空，则令 front, rear 都指向 node
|
||||
if self.is_empty():
|
||||
self.front = self.rear = node
|
||||
self._front = self._rear = node
|
||||
# 队首入队操作
|
||||
elif is_front:
|
||||
# 将 node 添加至链表头部
|
||||
self.front.prev = node
|
||||
node.next = self.front
|
||||
self.front = node # 更新头节点
|
||||
self._front.prev = node
|
||||
node.next = self._front
|
||||
self._front = node # 更新头节点
|
||||
# 队尾入队操作
|
||||
else:
|
||||
# 将 node 添加至链表尾部
|
||||
self.rear.next = node
|
||||
node.prev = self.rear
|
||||
self.rear = node # 更新尾节点
|
||||
self.__size += 1 # 更新队列长度
|
||||
self._rear.next = node
|
||||
node.prev = self._rear
|
||||
self._rear = node # 更新尾节点
|
||||
self._size += 1 # 更新队列长度
|
||||
|
||||
def push_first(self, num: int):
|
||||
"""队首入队"""
|
||||
|
|
@ -446,23 +446,23 @@ comments: true
|
|||
raise IndexError("双向队列为空")
|
||||
# 队首出队操作
|
||||
if is_front:
|
||||
val: int = self.front.val # 暂存头节点值
|
||||
val: int = self._front.val # 暂存头节点值
|
||||
# 删除头节点
|
||||
fnext: ListNode | None = self.front.next
|
||||
fnext: ListNode | None = self._front.next
|
||||
if fnext != None:
|
||||
fnext.prev = None
|
||||
self.front.next = None
|
||||
self.front = fnext # 更新头节点
|
||||
self._front.next = None
|
||||
self._front = fnext # 更新头节点
|
||||
# 队尾出队操作
|
||||
else:
|
||||
val: int = self.rear.val # 暂存尾节点值
|
||||
val: int = self._rear.val # 暂存尾节点值
|
||||
# 删除尾节点
|
||||
rprev: ListNode | None = self.rear.prev
|
||||
rprev: ListNode | None = self._rear.prev
|
||||
if rprev != None:
|
||||
rprev.next = None
|
||||
self.rear.prev = None
|
||||
self.rear = rprev # 更新尾节点
|
||||
self.__size -= 1 # 更新队列长度
|
||||
self._rear.prev = None
|
||||
self._rear = rprev # 更新尾节点
|
||||
self._size -= 1 # 更新队列长度
|
||||
return val
|
||||
|
||||
def pop_first(self) -> int:
|
||||
|
|
@ -477,17 +477,17 @@ comments: true
|
|||
"""访问队首元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("双向队列为空")
|
||||
return self.front.val
|
||||
return self._front.val
|
||||
|
||||
def peek_last(self) -> int:
|
||||
"""访问队尾元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("双向队列为空")
|
||||
return self.rear.val
|
||||
return self._rear.val
|
||||
|
||||
def to_array(self) -> list[int]:
|
||||
"""返回数组用于打印"""
|
||||
node = self.front
|
||||
node = self._front
|
||||
res = [0] * self.size()
|
||||
for i in range(self.size()):
|
||||
res[i] = node.val
|
||||
|
|
@ -2038,21 +2038,21 @@ comments: true
|
|||
|
||||
def __init__(self, capacity: int):
|
||||
"""构造方法"""
|
||||
self.__nums: list[int] = [0] * capacity
|
||||
self.__front: int = 0
|
||||
self.__size: int = 0
|
||||
self._nums: list[int] = [0] * capacity
|
||||
self._front: int = 0
|
||||
self._size: int = 0
|
||||
|
||||
def capacity(self) -> int:
|
||||
"""获取双向队列的容量"""
|
||||
return len(self.__nums)
|
||||
return len(self._nums)
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取双向队列的长度"""
|
||||
return self.__size
|
||||
return self._size
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断双向队列是否为空"""
|
||||
return self.__size == 0
|
||||
return self._size == 0
|
||||
|
||||
def index(self, i: int) -> int:
|
||||
"""计算环形数组索引"""
|
||||
|
|
@ -2063,61 +2063,61 @@ comments: true
|
|||
|
||||
def push_first(self, num: int):
|
||||
"""队首入队"""
|
||||
if self.__size == self.capacity():
|
||||
if self._size == self.capacity():
|
||||
print("双向队列已满")
|
||||
return
|
||||
# 队首指针向左移动一位
|
||||
# 通过取余操作，实现 front 越过数组头部后回到尾部
|
||||
self.__front = self.index(self.__front - 1)
|
||||
self._front = self.index(self._front - 1)
|
||||
# 将 num 添加至队首
|
||||
self.__nums[self.__front] = num
|
||||
self.__size += 1
|
||||
self._nums[self._front] = num
|
||||
self._size += 1
|
||||
|
||||
def push_last(self, num: int):
|
||||
"""队尾入队"""
|
||||
if self.__size == self.capacity():
|
||||
if self._size == self.capacity():
|
||||
print("双向队列已满")
|
||||
return
|
||||
# 计算尾指针，指向队尾索引 + 1
|
||||
rear = self.index(self.__front + self.__size)
|
||||
rear = self.index(self._front + self._size)
|
||||
# 将 num 添加至队尾
|
||||
self.__nums[rear] = num
|
||||
self.__size += 1
|
||||
self._nums[rear] = num
|
||||
self._size += 1
|
||||
|
||||
def pop_first(self) -> int:
|
||||
"""队首出队"""
|
||||
num = self.peek_first()
|
||||
# 队首指针向后移动一位
|
||||
self.__front = self.index(self.__front + 1)
|
||||
self.__size -= 1
|
||||
self._front = self.index(self._front + 1)
|
||||
self._size -= 1
|
||||
return num
|
||||
|
||||
def pop_last(self) -> int:
|
||||
"""队尾出队"""
|
||||
num = self.peek_last()
|
||||
self.__size -= 1
|
||||
self._size -= 1
|
||||
return num
|
||||
|
||||
def peek_first(self) -> int:
|
||||
"""访问队首元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("双向队列为空")
|
||||
return self.__nums[self.__front]
|
||||
return self._nums[self._front]
|
||||
|
||||
def peek_last(self) -> int:
|
||||
"""访问队尾元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("双向队列为空")
|
||||
# 计算尾元素索引
|
||||
last = self.index(self.__front + self.__size - 1)
|
||||
return self.__nums[last]
|
||||
last = self.index(self._front + self._size - 1)
|
||||
return self._nums[last]
|
||||
|
||||
def to_array(self) -> list[int]:
|
||||
"""返回数组用于打印"""
|
||||
# 仅转换有效长度范围内的列表元素
|
||||
res = []
|
||||
for i in range(self.__size):
|
||||
res.append(self.__nums[self.index(self.__front + i)])
|
||||
for i in range(self._size):
|
||||
res.append(self._nums[self.index(self._front + i)])
|
||||
return res
|
||||
```
|
||||
|
||||
|
|
|
|||
|
|
@ -345,50 +345,50 @@ comments: true
|
|||
|
||||
def __init__(self):
|
||||
"""构造方法"""
|
||||
self.__front: ListNode | None = None # 头节点 front
|
||||
self.__rear: ListNode | None = None # 尾节点 rear
|
||||
self.__size: int = 0
|
||||
self._front: ListNode | None = None # 头节点 front
|
||||
self._rear: ListNode | None = None # 尾节点 rear
|
||||
self._size: int = 0
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取队列的长度"""
|
||||
return self.__size
|
||||
return self._size
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断队列是否为空"""
|
||||
return not self.__front
|
||||
return not self._front
|
||||
|
||||
def push(self, num: int):
|
||||
"""入队"""
|
||||
# 尾节点后添加 num
|
||||
node = ListNode(num)
|
||||
# 如果队列为空，则令头、尾节点都指向该节点
|
||||
if self.__front is None:
|
||||
self.__front = node
|
||||
self.__rear = node
|
||||
if self._front is None:
|
||||
self._front = node
|
||||
self._rear = node
|
||||
# 如果队列不为空，则将该节点添加到尾节点后
|
||||
else:
|
||||
self.__rear.next = node
|
||||
self.__rear = node
|
||||
self.__size += 1
|
||||
self._rear.next = node
|
||||
self._rear = node
|
||||
self._size += 1
|
||||
|
||||
def pop(self) -> int:
|
||||
"""出队"""
|
||||
num = self.peek()
|
||||
# 删除头节点
|
||||
self.__front = self.__front.next
|
||||
self.__size -= 1
|
||||
self._front = self._front.next
|
||||
self._size -= 1
|
||||
return num
|
||||
|
||||
def peek(self) -> int:
|
||||
"""访问队首元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("队列为空")
|
||||
return self.__front.val
|
||||
return self._front.val
|
||||
|
||||
def to_list(self) -> list[int]:
|
||||
"""转化为列表用于打印"""
|
||||
queue = []
|
||||
temp = self.__front
|
||||
temp = self._front
|
||||
while temp:
|
||||
queue.append(temp.val)
|
||||
temp = temp.next
|
||||
|
|
@ -1240,53 +1240,53 @@ comments: true
|
|||
|
||||
def __init__(self, size: int):
|
||||
"""构造方法"""
|
||||
self.__nums: list[int] = [0] * size # 用于存储队列元素的数组
|
||||
self.__front: int = 0 # 队首指针，指向队首元素
|
||||
self.__size: int = 0 # 队列长度
|
||||
self._nums: list[int] = [0] * size # 用于存储队列元素的数组
|
||||
self._front: int = 0 # 队首指针，指向队首元素
|
||||
self._size: int = 0 # 队列长度
|
||||
|
||||
def capacity(self) -> int:
|
||||
"""获取队列的容量"""
|
||||
return len(self.__nums)
|
||||
return len(self._nums)
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取队列的长度"""
|
||||
return self.__size
|
||||
return self._size
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断队列是否为空"""
|
||||
return self.__size == 0
|
||||
return self._size == 0
|
||||
|
||||
def push(self, num: int):
|
||||
"""入队"""
|
||||
if self.__size == self.capacity():
|
||||
if self._size == self.capacity():
|
||||
raise IndexError("队列已满")
|
||||
# 计算尾指针，指向队尾索引 + 1
|
||||
# 通过取余操作，实现 rear 越过数组尾部后回到头部
|
||||
rear: int = (self.__front + self.__size) % self.capacity()
|
||||
rear: int = (self._front + self._size) % self.capacity()
|
||||
# 将 num 添加至队尾
|
||||
self.__nums[rear] = num
|
||||
self.__size += 1
|
||||
self._nums[rear] = num
|
||||
self._size += 1
|
||||
|
||||
def pop(self) -> int:
|
||||
"""出队"""
|
||||
num: int = self.peek()
|
||||
# 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
self.__front = (self.__front + 1) % self.capacity()
|
||||
self.__size -= 1
|
||||
self._front = (self._front + 1) % self.capacity()
|
||||
self._size -= 1
|
||||
return num
|
||||
|
||||
def peek(self) -> int:
|
||||
"""访问队首元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("队列为空")
|
||||
return self.__nums[self.__front]
|
||||
return self._nums[self._front]
|
||||
|
||||
def to_list(self) -> list[int]:
|
||||
"""返回列表用于打印"""
|
||||
res = [0] * self.size()
|
||||
j: int = self.__front
|
||||
j: int = self._front
|
||||
for i in range(self.size()):
|
||||
res[i] = self.__nums[(j % self.capacity())]
|
||||
res[i] = self._nums[(j % self.capacity())]
|
||||
j += 1
|
||||
return res
|
||||
```
|
||||
|
|
|
|||
|
|
@ -345,41 +345,41 @@ comments: true
|
|||
|
||||
def __init__(self):
|
||||
"""构造方法"""
|
||||
self.__peek: ListNode | None = None
|
||||
self.__size: int = 0
|
||||
self._peek: ListNode | None = None
|
||||
self._size: int = 0
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取栈的长度"""
|
||||
return self.__size
|
||||
return self._size
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断栈是否为空"""
|
||||
return not self.__peek
|
||||
return not self._peek
|
||||
|
||||
def push(self, val: int):
|
||||
"""入栈"""
|
||||
node = ListNode(val)
|
||||
node.next = self.__peek
|
||||
self.__peek = node
|
||||
self.__size += 1
|
||||
node.next = self._peek
|
||||
self._peek = node
|
||||
self._size += 1
|
||||
|
||||
def pop(self) -> int:
|
||||
"""出栈"""
|
||||
num = self.peek()
|
||||
self.__peek = self.__peek.next
|
||||
self.__size -= 1
|
||||
self._peek = self._peek.next
|
||||
self._size -= 1
|
||||
return num
|
||||
|
||||
def peek(self) -> int:
|
||||
"""访问栈顶元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("栈为空")
|
||||
return self.__peek.val
|
||||
return self._peek.val
|
||||
|
||||
def to_list(self) -> list[int]:
|
||||
"""转化为列表用于打印"""
|
||||
arr = []
|
||||
node = self.__peek
|
||||
node = self._peek
|
||||
while node:
|
||||
arr.append(node.val)
|
||||
node = node.next
|
||||
|
|
@ -1111,35 +1111,35 @@ comments: true
|
|||
|
||||
def __init__(self):
|
||||
"""构造方法"""
|
||||
self.__stack: list[int] = []
|
||||
self._stack: list[int] = []
|
||||
|
||||
def size(self) -> int:
|
||||
"""获取栈的长度"""
|
||||
return len(self.__stack)
|
||||
return len(self._stack)
|
||||
|
||||
def is_empty(self) -> bool:
|
||||
"""判断栈是否为空"""
|
||||
return self.__stack == []
|
||||
return self._stack == []
|
||||
|
||||
def push(self, item: int):
|
||||
"""入栈"""
|
||||
self.__stack.append(item)
|
||||
self._stack.append(item)
|
||||
|
||||
def pop(self) -> int:
|
||||
"""出栈"""
|
||||
if self.is_empty():
|
||||
raise IndexError("栈为空")
|
||||
return self.__stack.pop()
|
||||
return self._stack.pop()
|
||||
|
||||
def peek(self) -> int:
|
||||
"""访问栈顶元素"""
|
||||
if self.is_empty():
|
||||
raise IndexError("栈为空")
|
||||
return self.__stack[-1]
|
||||
return self._stack[-1]
|
||||
|
||||
def to_list(self) -> list[int]:
|
||||
"""返回列表用于打印"""
|
||||
return self.__stack
|
||||
return self._stack
|
||||
```
|
||||
|
||||
=== "C++"
|
||||
|
|
|
|||
|
|
@ -151,18 +151,18 @@ comments: true
|
|||
|
||||
def __init__(self, arr: list[int | None]):
|
||||
"""构造方法"""
|
||||
self.__tree = list(arr)
|
||||
self._tree = list(arr)
|
||||
|
||||
def size(self):
|
||||
"""节点数量"""
|
||||
return len(self.__tree)
|
||||
return len(self._tree)
|
||||
|
||||
def val(self, i: int) -> int:
|
||||
"""获取索引为 i 节点的值"""
|
||||
# 若索引越界，则返回 None ，代表空位
|
||||
if i < 0 or i >= self.size():
|
||||
return None
|
||||
return self.__tree[i]
|
||||
return self._tree[i]
|
||||
|
||||
def left(self, i: int) -> int | None:
|
||||
"""获取索引为 i 节点的左子节点的索引"""
|
||||
|
|
@ -185,18 +185,18 @@ comments: true
|
|||
self.res.append(self.val(i))
|
||||
return self.res
|
||||
|
||||
def __dfs(self, i: int, order: str):
|
||||
def dfs(self, i: int, order: str):
|
||||
"""深度优先遍历"""
|
||||
if self.val(i) is None:
|
||||
return
|
||||
# 前序遍历
|
||||
if order == "pre":
|
||||
self.res.append(self.val(i))
|
||||
self.__dfs(self.left(i), order)
|
||||
self.dfs(self.left(i), order)
|
||||
# 中序遍历
|
||||
if order == "in":
|
||||
self.res.append(self.val(i))
|
||||
self.__dfs(self.right(i), order)
|
||||
self.dfs(self.right(i), order)
|
||||
# 后序遍历
|
||||
if order == "post":
|
||||
self.res.append(self.val(i))
|
||||
|
|
@ -204,19 +204,19 @@ comments: true
|
|||
def pre_order(self) -> list[int]:
|
||||
"""前序遍历"""
|
||||
self.res = []
|
||||
self.__dfs(0, order="pre")
|
||||
self.dfs(0, order="pre")
|
||||
return self.res
|
||||
|
||||
def in_order(self) -> list[int]:
|
||||
"""中序遍历"""
|
||||
self.res = []
|
||||
self.__dfs(0, order="in")
|
||||
self.dfs(0, order="in")
|
||||
return self.res
|
||||
|
||||
def post_order(self) -> list[int]:
|
||||
"""后序遍历"""
|
||||
self.res = []
|
||||
self.__dfs(0, order="post")
|
||||
self.dfs(0, order="post")
|
||||
return self.res
|
||||
```
|
||||
|
||||
|
|
|
|||
|
|
@ -229,7 +229,7 @@ AVL 树既是二叉搜索树也是平衡二叉树，同时满足这两类二叉
|
|||
return node.height
|
||||
return -1
|
||||
|
||||
def __update_height(self, node: TreeNode | None):
|
||||
def update_height(self, node: TreeNode | None):
|
||||
"""更新节点高度"""
|
||||
# 节点高度等于最高子树高度 + 1
|
||||
node.height = max([self.height(node.left), self.height(node.right)]) + 1
|
||||
|
|
@ -636,7 +636,7 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
=== "Python"
|
||||
|
||||
```python title="avl_tree.py"
|
||||
def __right_rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
def right_rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
"""右旋操作"""
|
||||
child = node.left
|
||||
grand_child = child.right
|
||||
|
|
@ -644,8 +644,8 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
child.right = node
|
||||
node.left = grand_child
|
||||
# 更新节点高度
|
||||
self.__update_height(node)
|
||||
self.__update_height(child)
|
||||
self.update_height(node)
|
||||
self.update_height(child)
|
||||
# 返回旋转后子树的根节点
|
||||
return child
|
||||
```
|
||||
|
|
@ -873,7 +873,7 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
=== "Python"
|
||||
|
||||
```python title="avl_tree.py"
|
||||
def __left_rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
def left_rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
"""左旋操作"""
|
||||
child = node.right
|
||||
grand_child = child.left
|
||||
|
|
@ -881,8 +881,8 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
child.left = node
|
||||
node.right = grand_child
|
||||
# 更新节点高度
|
||||
self.__update_height(node)
|
||||
self.__update_height(child)
|
||||
self.update_height(node)
|
||||
self.update_height(child)
|
||||
# 返回旋转后子树的根节点
|
||||
return child
|
||||
```
|
||||
|
|
@ -1135,7 +1135,7 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
=== "Python"
|
||||
|
||||
```python title="avl_tree.py"
|
||||
def __rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
def rotate(self, node: TreeNode | None) -> TreeNode | None:
|
||||
"""执行旋转操作，使该子树重新恢复平衡"""
|
||||
# 获取节点 node 的平衡因子
|
||||
balance_factor = self.balance_factor(node)
|
||||
|
|
@ -1143,20 +1143,20 @@ AVL 树的特点在于“旋转”操作，它能够在不影响二叉树的中
|
|||
if balance_factor > 1:
|
||||
if self.balance_factor(node.left) >= 0:
|
||||
# 右旋
|
||||
return self.__right_rotate(node)
|
||||
return self.right_rotate(node)
|
||||
else:
|
||||
# 先左旋后右旋
|
||||
node.left = self.__left_rotate(node.left)
|
||||
return self.__right_rotate(node)
|
||||
node.left = self.left_rotate(node.left)
|
||||
return self.right_rotate(node)
|
||||
# 右偏树
|
||||
elif balance_factor < -1:
|
||||
if self.balance_factor(node.right) <= 0:
|
||||
# 左旋
|
||||
return self.__left_rotate(node)
|
||||
return self.left_rotate(node)
|
||||
else:
|
||||
# 先右旋后左旋
|
||||
node.right = self.__right_rotate(node.right)
|
||||
return self.__left_rotate(node)
|
||||
node.right = self.right_rotate(node.right)
|
||||
return self.left_rotate(node)
|
||||
# 平衡树，无须旋转，直接返回
|
||||
return node
|
||||
```
|
||||
|
|
@ -1552,24 +1552,24 @@ AVL 树的节点插入操作与二叉搜索树在主体上类似。唯一的区
|
|||
```python title="avl_tree.py"
|
||||
def insert(self, val):
|
||||
"""插入节点"""
|
||||
self.root = self.__insert_helper(self.root, val)
|
||||
self._root = self.insert_helper(self._root, val)
|
||||
|
||||
def __insert_helper(self, node: TreeNode | None, val: int) -> TreeNode:
|
||||
def insert_helper(self, node: TreeNode | None, val: int) -> TreeNode:
|
||||
"""递归插入节点（辅助方法）"""
|
||||
if node is None:
|
||||
return TreeNode(val)
|
||||
# 1. 查找插入位置，并插入节点
|
||||
if val < node.val:
|
||||
node.left = self.__insert_helper(node.left, val)
|
||||
node.left = self.insert_helper(node.left, val)
|
||||
elif val > node.val:
|
||||
node.right = self.__insert_helper(node.right, val)
|
||||
node.right = self.insert_helper(node.right, val)
|
||||
else:
|
||||
# 重复节点不插入，直接返回
|
||||
return node
|
||||
# 更新节点高度
|
||||
self.__update_height(node)
|
||||
self.update_height(node)
|
||||
# 2. 执行旋转操作，使该子树重新恢复平衡
|
||||
return self.__rotate(node)
|
||||
return self.rotate(node)
|
||||
```
|
||||
|
||||
=== "C++"
|
||||
|
|
@ -1904,17 +1904,17 @@ AVL 树的节点插入操作与二叉搜索树在主体上类似。唯一的区
|
|||
```python title="avl_tree.py"
|
||||
def remove(self, val: int):
|
||||
"""删除节点"""
|
||||
self.root = self.__remove_helper(self.root, val)
|
||||
self._root = self.remove_helper(self._root, val)
|
||||
|
||||
def __remove_helper(self, node: TreeNode | None, val: int) -> TreeNode | None:
|
||||
def remove_helper(self, node: TreeNode | None, val: int) -> TreeNode | None:
|
||||
"""递归删除节点（辅助方法）"""
|
||||
if node is None:
|
||||
return None
|
||||
# 1. 查找节点，并删除之
|
||||
if val < node.val:
|
||||
node.left = self.__remove_helper(node.left, val)
|
||||
node.left = self.remove_helper(node.left, val)
|
||||
elif val > node.val:
|
||||
node.right = self.__remove_helper(node.right, val)
|
||||
node.right = self.remove_helper(node.right, val)
|
||||
else:
|
||||
if node.left is None or node.right is None:
|
||||
child = node.left or node.right
|
||||
|
|
@ -1929,12 +1929,12 @@ AVL 树的节点插入操作与二叉搜索树在主体上类似。唯一的区
|
|||
temp = node.right
|
||||
while temp.left is not None:
|
||||
temp = temp.left
|
||||
node.right = self.__remove_helper(node.right, temp.val)
|
||||
node.right = self.remove_helper(node.right, temp.val)
|
||||
node.val = temp.val
|
||||
# 更新节点高度
|
||||
self.__update_height(node)
|
||||
self.update_height(node)
|
||||
# 2. 执行旋转操作，使该子树重新恢复平衡
|
||||
return self.__rotate(node)
|
||||
return self.rotate(node)
|
||||
```
|
||||
|
||||
=== "C++"
|
||||
|
|
|
|||
|
|
@ -46,7 +46,7 @@ comments: true
|
|||
```python title="binary_search_tree.py"
|
||||
def search(self, num: int) -> TreeNode | None:
|
||||
"""查找节点"""
|
||||
cur = self.__root
|
||||
cur = self._root
|
||||
# 循环查找，越过叶节点后跳出
|
||||
while cur is not None:
|
||||
# 目标节点在 cur 的右子树中
|
||||
|
|
@ -340,11 +340,11 @@ comments: true
|
|||
def insert(self, num: int):
|
||||
"""插入节点"""
|
||||
# 若树为空，则初始化根节点
|
||||
if self.__root is None:
|
||||
self.__root = TreeNode(num)
|
||||
if self._root is None:
|
||||
self._root = TreeNode(num)
|
||||
return
|
||||
# 循环查找，越过叶节点后跳出
|
||||
cur, pre = self.__root, None
|
||||
cur, pre = self._root, None
|
||||
while cur is not None:
|
||||
# 找到重复节点，直接返回
|
||||
if cur.val == num:
|
||||
|
|
@ -792,10 +792,10 @@ comments: true
|
|||
def remove(self, num: int):
|
||||
"""删除节点"""
|
||||
# 若树为空，直接提前返回
|
||||
if self.__root is None:
|
||||
if self._root is None:
|
||||
return
|
||||
# 循环查找，越过叶节点后跳出
|
||||
cur, pre = self.__root, None
|
||||
cur, pre = self._root, None
|
||||
while cur is not None:
|
||||
# 找到待删除节点，跳出循环
|
||||
if cur.val == num:
|
||||
|
|
@ -816,14 +816,14 @@ comments: true
|
|||
# 当子节点数量 = 0 / 1 时， child = null / 该子节点
|
||||
child = cur.left or cur.right
|
||||
# 删除节点 cur
|
||||
if cur != self.__root:
|
||||
if cur != self._root:
|
||||
if pre.left == cur:
|
||||
pre.left = child
|
||||
else:
|
||||
pre.right = child
|
||||
else:
|
||||
# 若删除节点为根节点，则重新指定根节点
|
||||
self.__root = child
|
||||
self._root = child
|
||||
# 子节点数量 = 2
|
||||
else:
|
||||
# 获取中序遍历中 cur 的下一个节点
|
||||
|
|
|
|||
Loading…
Reference in a new issue