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This commit is contained in:
krahets
parent
f6b9a75c8f
commit
a2073d5f1a
3 changed files with 98 additions and 98 deletions
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@ -12,16 +12,16 @@ comments: true
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## 5.3.1. 双向队列常用操作
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双向队列的常用操作见下表，方法名需根据语言来确定，此处以 Java 为例。
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双向队列的常用操作见下表，方法名需根据语言来确定。
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<div class="center-table" markdown>
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| 方法名 | 描述 | 时间复杂度 |
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| ------------ | ---------------- | ---------- |
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| ----------- | -------------- | ---------- |
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| pushFirst() | 将元素添加至队首 | $O(1)$ |
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| pushLast() | 将元素添加至队尾 | $O(1)$ |
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| pollFirst() | 删除队首元素 | $O(1)$ |
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| pollLast() | 删除队尾元素 | $O(1)$ |
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| popFirst() | 删除队首元素 | $O(1)$ |
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| popLast() | 删除队尾元素 | $O(1)$ |
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| peekFirst() | 访问队首元素 | $O(1)$ |
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| peekLast() | 访问队尾元素 | $O(1)$ |
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@ -47,8 +47,8 @@ comments: true
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int peekLast = deque.peekLast(); // 队尾元素
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/* 元素出队 */
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int pollFirst = deque.pollFirst(); // 队首元素出队
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int pollLast = deque.pollLast(); // 队尾元素出队
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int popFirst = deque.pollFirst(); // 队首元素出队
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int popLast = deque.pollLast(); // 队尾元素出队
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/* 获取双向队列的长度 */
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int size = deque.size();
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@ -272,9 +272,9 @@ comments: true
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let peekLast = deque.last! // 队尾元素
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/* 元素出队 */
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// 使用 Array 模拟时 pollFirst 的复杂度为 O(n)
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let pollFirst = deque.removeFirst() // 队首元素出队
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let pollLast = deque.removeLast() // 队尾元素出队
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// 使用 Array 模拟时 popFirst 的复杂度为 O(n)
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let popFirst = deque.removeFirst() // 队首元素出队
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let popLast = deque.removeLast() // 队尾元素出队
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/* 获取双向队列的长度 */
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let size = deque.count
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@ -310,11 +310,11 @@ comments: true
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=== "pushFirst()"
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=== "pollLast()"
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=== "popLast()"
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=== "pollFirst()"
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=== "popFirst()"
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以下是具体实现代码。
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@ -384,7 +384,7 @@ comments: true
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}
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/* 出队操作 */
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private Integer poll(boolean isFront) {
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private Integer pop(boolean isFront) {
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// 若队列为空，直接返回 null
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if (isEmpty())
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return null;
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@ -415,13 +415,13 @@ comments: true
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}
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/* 队首出队 */
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public Integer pollFirst() {
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return poll(true);
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public Integer popFirst() {
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return pop(true);
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}
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/* 队尾出队 */
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public Integer pollLast() {
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return poll(false);
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public Integer popLast() {
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return pop(false);
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}
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/* 访问队首元素 */
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@ -522,7 +522,7 @@ comments: true
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}
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/* 出队操作 */
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int poll(bool isFront) {
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int pop(bool isFront) {
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// 若队列为空，直接返回 -1
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if (isEmpty())
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return -1;
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@ -553,13 +553,13 @@ comments: true
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}
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/* 队首出队 */
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int pollFirst() {
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return poll(true);
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int popFirst() {
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return pop(true);
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}
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/* 队尾出队 */
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int pollLast() {
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return poll(false);
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int popLast() {
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return pop(false);
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}
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/* 访问队首元素 */
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@ -640,7 +640,7 @@ comments: true
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""" 队尾入队 """
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self.push(num, False)
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def poll(self, is_front: bool) -> int:
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def pop(self, is_front: bool) -> int:
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""" 出队操作 """
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# 若队列为空，直接返回 None
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if self.is_empty():
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@ -666,13 +666,13 @@ comments: true
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self.__size -= 1 # 更新队列长度
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return val
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def poll_first(self) -> int:
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def pop_first(self) -> int:
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""" 队首出队 """
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return self.poll(True)
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return self.pop(True)
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def poll_last(self) -> int:
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def pop_last(self) -> int:
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""" 队尾出队 """
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return self.poll(False)
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return self.pop(False)
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def peek_first(self) -> int:
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""" 访问队首元素 """
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@ -719,7 +719,7 @@ comments: true
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}
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/* 队首元素出队 */
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func (s *linkedListDeque) pollFirst() any {
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func (s *linkedListDeque) popFirst() any {
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if s.isEmpty() {
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return nil
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}
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@ -729,7 +729,7 @@ comments: true
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}
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/* 队尾元素出队 */
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func (s *linkedListDeque) pollLast() any {
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func (s *linkedListDeque) popLast() any {
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if s.isEmpty() {
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return nil
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}
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@ -833,7 +833,7 @@ comments: true
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}
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/* 队尾出队操作 */
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pollLast() {
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popLast() {
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if (this.#queSize === 0) {
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return null;
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}
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@ -850,7 +850,7 @@ comments: true
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}
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/* 队首出队操作 */
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pollFirst() {
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popFirst() {
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if (this.#queSize === 0) {
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return null;
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}
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@ -960,7 +960,7 @@ comments: true
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}
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/* 队尾出队操作 */
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pollLast(): number {
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popLast(): number {
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if (this.queSize === 0) {
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return null;
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}
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@ -977,7 +977,7 @@ comments: true
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}
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/* 队首出队操作 */
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pollFirst(): number {
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popFirst(): number {
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if (this.queSize === 0) {
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return null;
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}
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@ -1112,7 +1112,7 @@ comments: true
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}
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/* 出队操作 */
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private func poll(isFront: Bool) -> Int {
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private func pop(isFront: Bool) -> Int {
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if isEmpty() {
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fatalError("双向队列为空")
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}
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@ -1144,13 +1144,13 @@ comments: true
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}
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/* 队首出队 */
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func pollFirst() -> Int {
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poll(isFront: true)
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func popFirst() -> Int {
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pop(isFront: true)
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}
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/* 队尾出队 */
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func pollLast() -> Int {
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poll(isFront: false)
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func popLast() -> Int {
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pop(isFront: false)
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}
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/* 访问队首元素 */
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@ -1270,7 +1270,7 @@ comments: true
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}
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// 出队操作
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pub fn poll(self: *Self, isFront: bool) T {
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pub fn pop(self: *Self, isFront: bool) T {
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if (self.isEmpty()) @panic("双向队列为空");
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var val: T = undefined;
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// 队首出队操作
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@ -1299,13 +1299,13 @@ comments: true
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}
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// 队首出队
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pub fn pollFirst(self: *Self) T {
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return self.poll(true);
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pub fn popFirst(self: *Self) T {
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return self.pop(true);
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}
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// 队尾出队
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pub fn pollLast(self: *Self) T {
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return self.poll(false);
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pub fn popLast(self: *Self) T {
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return self.pop(false);
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}
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// 访问队首元素
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@ -1362,11 +1362,11 @@ comments: true
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=== "pushFirst()"
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=== "pollLast()"
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=== "popLast()"
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=== "pollFirst()"
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=== "popFirst()"
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以下是具体实现代码。
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@ -1436,7 +1436,7 @@ comments: true
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}
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/* 队首出队 */
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public int pollFirst() {
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public int popFirst() {
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int num = peekFirst();
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// 队首指针向后移动一位
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front = index(front + 1);
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@ -1445,7 +1445,7 @@ comments: true
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}
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/* 队尾出队 */
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public int pollLast() {
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public int popLast() {
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int num = peekLast();
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queSize--;
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return num;
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@ -1547,7 +1547,7 @@ comments: true
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}
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/* 队首出队 */
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int pollFirst() {
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int popFirst() {
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int num = peekFirst();
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// 队首指针向后移动一位
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front = index(front + 1);
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@ -1556,7 +1556,7 @@ comments: true
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}
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/* 队尾出队 */
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int pollLast() {
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int popLast() {
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int num = peekLast();
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queSize--;
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return num;
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@ -1644,7 +1644,7 @@ comments: true
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self.__nums[rear] = num
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self.__size += 1
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def poll_first(self) -> int:
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def pop_first(self) -> int:
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""" 队首出队 """
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num = self.peek_first()
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# 队首指针向后移动一位
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@ -1652,7 +1652,7 @@ comments: true
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self.__size -= 1
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return num
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def poll_last(self) -> int:
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def pop_last(self) -> int:
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""" 队尾出队 """
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num = self.peek_last()
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self.__size -= 1
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@ -1752,7 +1752,7 @@ comments: true
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}
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/* 队首出队 */
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pollFirst() {
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popFirst() {
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const num = this.peekFirst();
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// 队首指针向后移动一位
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this.#front = this.index(this.#front + 1);
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@ -1761,7 +1761,7 @@ comments: true
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}
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/* 队尾出队 */
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pollLast() {
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popLast() {
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const num = this.peekLast();
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this.#queSize--;
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return num;
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@ -1862,7 +1862,7 @@ comments: true
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}
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/* 队首出队 */
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pollFirst(): number {
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popFirst(): number {
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const num: number = this.peekFirst();
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// 队首指针向后移动一位
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this.front = this.index(this.front + 1);
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@ -1871,7 +1871,7 @@ comments: true
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}
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/* 队尾出队 */
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pollLast(): number {
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popLast(): number {
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const num: number = this.peekLast();
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this.queSize--;
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return num;
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@ -1984,7 +1984,7 @@ comments: true
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}
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/* 队首出队 */
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func pollFirst() -> Int {
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func popFirst() -> Int {
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let num = peekFirst()
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// 队首指针向后移动一位
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front = index(i: front + 1)
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@ -1993,7 +1993,7 @@ comments: true
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}
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/* 队尾出队 */
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func pollLast() -> Int {
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func popLast() -> Int {
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let num = peekLast()
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queSize -= 1
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return num
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@ -14,14 +14,14 @@ comments: true
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## 5.2.1. 队列常用操作
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队列的常用操作见下表，方法名需根据语言来确定，此处以 Java 为例。
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队列的常用操作见下表。需要注意，不同编程语言的方法名是不同的，在这里我们采用与栈相同的方法命名。
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<div class="center-table" markdown>
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| 方法名 | 描述 | 时间复杂度 |
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| --------- | -------------------------- | -------- |
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| push() | 元素入队，即将元素添加至队尾 | $O(1)$ |
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| poll() | 队首元素出队 | $O(1)$ |
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| pop() | 队首元素出队 | $O(1)$ |
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| peek() | 访问队首元素 | $O(1)$ |
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</div>
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@ -45,7 +45,7 @@ comments: true
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int peek = queue.peek();
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/* 元素出队 */
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int poll = queue.poll();
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int pop = queue.poll();
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/* 获取队列的长度 */
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int size = queue.size();
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@ -126,8 +126,8 @@ comments: true
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peek := queue.Front()
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/* 元素出队 */
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poll := queue.Front()
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queue.Remove(poll)
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pop := queue.Front()
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queue.Remove(pop)
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/* 获取队列的长度 */
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size := queue.Len()
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@ -155,7 +155,7 @@ comments: true
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/* 元素出队 */
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// 底层是数组，因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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const pop = queue.shift();
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/* 获取队列的长度 */
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const size = queue.length;
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@ -183,7 +183,7 @@ comments: true
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/* 元素出队 */
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// 底层是数组，因此 shift() 方法的时间复杂度为 O(n)
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const poll = queue.shift();
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const pop = queue.shift();
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/* 获取队列的长度 */
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const size = queue.length;
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@ -215,7 +215,7 @@ comments: true
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int peek = queue.Peek();
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/* 元素出队 */
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int poll = queue.Dequeue();
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int pop = queue.Dequeue();
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/* 获取队列的长度 */
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int size = queue.Count();
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@ -242,7 +242,7 @@ comments: true
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let peek = queue.first!
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|
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/* 元素出队 */
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// 使用 Array 模拟时 poll 的复杂度为 O(n)
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// 由于是数组，因此 removeFirst 的复杂度为 O(n)
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let pool = queue.removeFirst()
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/* 获取队列的长度 */
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|
|
@ -272,8 +272,8 @@ comments: true
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=== "push()"
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||||
|
||||
|
||||
=== "poll()"
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||||
|
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=== "pop()"
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||||
|
||||
|
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以下是使用链表实现队列的示例代码。
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||||
|
||||
|
|
@ -317,7 +317,7 @@ comments: true
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|||
}
|
||||
|
||||
/* 出队 */
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||||
public int poll() {
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public int pop() {
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int num = peek();
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// 删除头结点
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front = front.next;
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|
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@ -394,7 +394,7 @@ comments: true
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|||
}
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||||
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/* 出队 */
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||||
void poll() {
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void pop() {
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int num = peek();
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||||
// 删除头结点
|
||||
ListNode *tmp = front;
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||||
|
|
@ -457,7 +457,7 @@ comments: true
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self.__rear = node
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||||
self.__size += 1
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|
||||
def poll(self) -> int:
|
||||
def pop(self) -> int:
|
||||
""" 出队 """
|
||||
num = self.peek()
|
||||
# 删除头结点
|
||||
|
|
@ -504,7 +504,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
func (s *linkedListQueue) poll() any {
|
||||
func (s *linkedListQueue) pop() any {
|
||||
if s.isEmpty() {
|
||||
return nil
|
||||
}
|
||||
|
|
@ -579,7 +579,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
poll() {
|
||||
pop() {
|
||||
const num = this.peek();
|
||||
// 删除头结点
|
||||
this.#front = this.#front.next;
|
||||
|
|
@ -648,7 +648,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
poll(): number {
|
||||
pop(): number {
|
||||
const num = this.peek();
|
||||
if (!this.front) throw new Error('队列为空');
|
||||
// 删除头结点
|
||||
|
|
@ -730,7 +730,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
public int poll()
|
||||
public int pop()
|
||||
{
|
||||
int num = peek();
|
||||
// 删除头结点
|
||||
|
|
@ -805,7 +805,7 @@ comments: true
|
|||
|
||||
/* 出队 */
|
||||
@discardableResult
|
||||
func poll() -> Int {
|
||||
func pop() -> Int {
|
||||
let num = peek()
|
||||
// 删除头结点
|
||||
front = front?.next
|
||||
|
|
@ -899,7 +899,7 @@ comments: true
|
|||
}
|
||||
|
||||
// 出队
|
||||
pub fn poll(self: *Self) T {
|
||||
pub fn pop(self: *Self) T {
|
||||
var num = self.peek();
|
||||
// 删除头结点
|
||||
self.front = self.front.?.next;
|
||||
|
|
@ -942,8 +942,8 @@ comments: true
|
|||
=== "push()"
|
||||
|
||||
|
||||
=== "poll()"
|
||||
|
||||
=== "pop()"
|
||||
|
||||
|
||||
细心的同学可能会发现一个问题：在不断入队与出队的过程中，`front` 和 `rear` 都在向右移动，**在到达数组尾部后就无法继续移动了**。为解决此问题，**我们考虑将数组看作是首尾相接的**，这样的数组被称为「环形数组」。
|
||||
|
||||
|
|
@ -993,7 +993,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
public int poll() {
|
||||
public int pop() {
|
||||
int num = peek();
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
front = (front + 1) % capacity();
|
||||
|
|
@ -1073,7 +1073,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
void poll() {
|
||||
void pop() {
|
||||
int num = peek();
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
front = (front + 1) % queCapacity;
|
||||
|
|
@ -1132,7 +1132,7 @@ comments: true
|
|||
self.__nums[rear] = num
|
||||
self.__size += 1
|
||||
|
||||
def poll(self) -> int:
|
||||
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
|
||||
|
|
@ -1201,7 +1201,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
func (q *arrayQueue) poll() any {
|
||||
func (q *arrayQueue) pop() any {
|
||||
num := q.peek()
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
q.front = (q.front + 1) % q.queCapacity
|
||||
|
|
@ -1271,7 +1271,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
poll() {
|
||||
pop() {
|
||||
const num = this.peek();
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
this.#front = (this.#front + 1) % this.capacity;
|
||||
|
|
@ -1342,7 +1342,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
poll(): number {
|
||||
pop(): number {
|
||||
const num = this.peek();
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
this.front = (this.front + 1) % this.capacity;
|
||||
|
|
@ -1426,7 +1426,7 @@ comments: true
|
|||
}
|
||||
|
||||
/* 出队 */
|
||||
public int poll()
|
||||
public int pop()
|
||||
{
|
||||
int num = peek();
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
|
|
@ -1502,7 +1502,7 @@ comments: true
|
|||
|
||||
/* 出队 */
|
||||
@discardableResult
|
||||
func poll() -> Int {
|
||||
func pop() -> Int {
|
||||
let num = peek()
|
||||
// 队首指针向后移动一位，若越过尾部则返回到数组头部
|
||||
front = (front + 1) % capacity()
|
||||
|
|
@ -1592,7 +1592,7 @@ comments: true
|
|||
}
|
||||
|
||||
// 出队
|
||||
pub fn poll(self: *Self) T {
|
||||
pub fn pop(self: *Self) T {
|
||||
var num = 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();
|
||||
|
|
|
|||
|
|
@ -16,7 +16,7 @@ comments: true
|
|||
|
||||
## 5.1.1. 栈常用操作
|
||||
|
||||
栈的常用操作见下表，方法名需根据语言来确定，此处以 Java 为例。
|
||||
栈的常用操作见下表，方法名需根据编程语言来确定，此处我们以常见的 `push` , `pop` , `peek` 为例。
|
||||
|
||||
<div class="center-table" markdown>
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue