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43 lines
1.1 KiB
43 lines
1.1 KiB
/**
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* File: deque.dart
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* Created Time: 2023-03-28
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* Author: liuyuxin (gvenusleo@gmail.com)
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*/
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import 'dart:collection';
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void main() {
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/* 初始化双向队列 */
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final Queue<int> deque = Queue();
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deque.addFirst(3);
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deque.addLast(2);
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deque.addLast(5);
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print("双向队列 deque = $deque");
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/* 访问元素 */
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final int peekFirst = deque.first;
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print("队首元素 peekFirst = $peekFirst");
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final int peekLast = deque.last;
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print("队尾元素 peekLast = $peekLast");
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/* 元素入队 */
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deque.addLast(4);
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print("元素 4 队尾入队后 deque = $deque");
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deque.addFirst(1);
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print("元素 1 队首入队后 deque = $deque");
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/* 元素出队 */
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final int popLast = deque.removeLast();
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print("队尾出队元素 = $popLast ，队尾出队后 deque = $deque");
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final int popFirst = deque.removeFirst();
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print("队首出队元素 = $popFirst ，队首出队后 deque = $deque");
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/* 获取双向队列的长度 */
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final int size = deque.length;
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print("双向队列长度 size = $size");
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/* 判断双向队列是否为空 */
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final bool isEmpty = deque.isEmpty;
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print("双向队列是否为空 = $isEmpty");
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}
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