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5 changed files with 34 additions and 33 deletions
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@ -26,9 +26,9 @@ comments: true
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```python title="list.py"
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# 初始化列表
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# 无初始值
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nums1: nums[int] = []
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nums1: list[int] = []
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# 有初始值
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nums: nums[int] = [1, 3, 2, 5, 4]
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nums: list[int] = [1, 3, 2, 5, 4]
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```
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=== "C++"
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@ -681,7 +681,7 @@ comments: true
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```python title="list.py"
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# 拼接两个列表
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nums1: nums[int] = [6, 8, 7, 10, 9]
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nums1: list[int] = [6, 8, 7, 10, 9]
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nums += nums1 # 将列表 nums1 拼接到 nums 之后
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```
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@ -602,8 +602,8 @@ comments: true
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```c title="n_queens.c"
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/* 回溯算法:N 皇后 */
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void backtrack(int row, int n, char state[MAX_N][MAX_N], char ***res, int *resSize, bool cols[MAX_N],
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bool diags1[2 * MAX_N - 1], bool diags2[2 * MAX_N - 1]) {
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void backtrack(int row, int n, char state[MAX_SIZE][MAX_SIZE], char ***res, int *resSize, bool cols[MAX_SIZE],
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bool diags1[2 * MAX_SIZE - 1], bool diags2[2 * MAX_SIZE - 1]) {
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// 当放置完所有行时,记录解
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if (row == n) {
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res[*resSize] = (char **)malloc(sizeof(char *) * n);
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@ -635,7 +635,7 @@ comments: true
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/* 求解 N 皇后 */
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char ***nQueens(int n, int *returnSize) {
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char state[MAX_N][MAX_N];
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char state[MAX_SIZE][MAX_SIZE];
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// 初始化 n*n 大小的棋盘,其中 'Q' 代表皇后,'#' 代表空位
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for (int i = 0; i < n; ++i) {
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for (int j = 0; j < n; ++j) {
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@ -643,11 +643,11 @@ comments: true
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}
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state[i][n] = '\0';
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}
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bool cols[MAX_N] = {false}; // 记录列是否有皇后
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bool diags1[2 * MAX_N - 1] = {false}; // 记录主对角线是否有皇后
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bool diags2[2 * MAX_N - 1] = {false}; // 记录副对角线是否有皇后
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bool cols[MAX_SIZE] = {false}; // 记录列是否有皇后
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bool diags1[2 * MAX_SIZE - 1] = {false}; // 记录主对角线是否有皇后
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bool diags2[2 * MAX_SIZE - 1] = {false}; // 记录副对角线是否有皇后
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char ***res = (char ***)malloc(sizeof(char **) * MAX_RES);
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char ***res = (char ***)malloc(sizeof(char **) * MAX_SIZE);
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*returnSize = 0;
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backtrack(0, n, state, res, returnSize, cols, diags1, diags2);
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return res;
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@ -427,7 +427,7 @@ comments: true
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/* 构建二叉树 */
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TreeNode *buildTree(int *preorder, int preorderSize, int *inorder, int inorderSize) {
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// 初始化哈希表,存储 inorder 元素到索引的映射
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int *inorderMap = (int *)malloc(sizeof(int) * MAX_N);
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int *inorderMap = (int *)malloc(sizeof(int) * MAX_SIZE);
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for (int i = 0; i < inorderSize; i++) {
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inorderMap[inorder[i]] = i;
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}
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@ -437,28 +437,29 @@ comments: true
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```dart title="merge_sort.dart"
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/* 合并左子数组和右子数组 */
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// 左子数组区间 [left, mid]
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// 右子数组区间 [mid + 1, right]
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void merge(List<int> nums, int left, int mid, int right) {
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// 初始化辅助数组
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List<int> tmp = nums.sublist(left, right + 1);
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// 左子数组的起始索引和结束索引
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int leftStart = left - left, leftEnd = mid - left;
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// 右子数组的起始索引和结束索引
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int rightStart = mid + 1 - left, rightEnd = right - left;
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// i, j 分别指向左子数组、右子数组的首元素
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int i = leftStart, j = rightStart;
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// 通过覆盖原数组 nums 来合并左子数组和右子数组
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for (int k = left; k <= right; k++) {
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// 若“左子数组已全部合并完”,则选取右子数组元素,并且 j++
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if (i > leftEnd)
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nums[k] = tmp[j++];
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// 否则,若“右子数组已全部合并完”或“左子数组元素 <= 右子数组元素”,则选取左子数组元素,并且 i++
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else if (j > rightEnd || tmp[i] <= tmp[j])
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nums[k] = tmp[i++];
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// 否则,若“左右子数组都未全部合并完”且“左子数组元素 > 右子数组元素”,则选取右子数组元素,并且 j++
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// 左子数组区间 [left, mid], 右子数组区间 [mid+1, right]
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// 创建一个临时数组 tmp ,用于存放合并后的结果
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List<int> tmp = List.filled(right - left + 1, 0);
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// 初始化左子数组和右子数组的起始索引
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int i = left, j = mid + 1, k = 0;
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// 当左右子数组都还有元素时,比较并将较小的元素复制到临时数组中
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while (i <= mid && j <= right) {
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if (nums[i] <= nums[j])
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tmp[k++] = nums[i++];
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else
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nums[k] = tmp[j++];
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tmp[k++] = nums[j++];
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}
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// 将左子数组和右子数组的剩余元素复制到临时数组中
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while (i <= mid) {
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tmp[k++] = nums[i++];
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}
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while (j <= right) {
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tmp[k++] = nums[j++];
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}
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// 将临时数组 tmp 中的元素复制回原数组 nums 的对应区间
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for (k = 0; k < tmp.length; k++) {
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nums[left + k] = tmp[k];
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}
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}
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@ -258,14 +258,14 @@ comments: true
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TreeNode **queue;
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/* 辅助队列 */
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queue = (TreeNode **)malloc(sizeof(TreeNode *) * MAX_NODE_SIZE);
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queue = (TreeNode **)malloc(sizeof(TreeNode *) * MAX_SIZE);
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// 队列指针
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front = 0, rear = 0;
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// 加入根节点
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queue[rear++] = root;
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// 初始化一个列表,用于保存遍历序列
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/* 辅助数组 */
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arr = (int *)malloc(sizeof(int) * MAX_NODE_SIZE);
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arr = (int *)malloc(sizeof(int) * MAX_SIZE);
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// 数组指针
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index = 0;
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while (front < rear) {
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