43 lines
1.2 KiB
Dart
43 lines
1.2 KiB
Dart
/**
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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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/* Initialize double-ended queue */
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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("Double-ended queue deque = $deque");
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/* Access element */
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final int peekFirst = deque.first;
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print("Front element peekFirst = $peekFirst");
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final int peekLast = deque.last;
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print("Back element peekLast = $peekLast");
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/* Element enqueue */
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deque.addLast(4);
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print("Element 4 enqueued at the back, deque = $deque");
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deque.addFirst(1);
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print("Element 1 enqueued at the front, deque = $deque");
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/* Element dequeue */
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final int popLast = deque.removeLast();
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print("Back dequeue element = $popLast, deque after back dequeue = $deque");
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final int popFirst = deque.removeFirst();
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print("Front dequeue element = $popFirst, deque after front dequeue = $deque");
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/* Get the length of the double-ended queue */
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final int size = deque.length;
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print("Double-ended queue length size = $size");
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/* Determine if the double-ended queue is empty */
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final bool isEmpty = deque.isEmpty;
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print("Is the double-ended queue empty = $isEmpty");
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}
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