45 lines
1.3 KiB
Kotlin
45 lines
1.3 KiB
Kotlin
/**
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* File: deque.kt
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* Created Time: 2024-01-25
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* Author: curtishd (1023632660@qq.com)
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*/
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package chapter_stack_and_queue
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import java.util.*
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/* Driver Code */
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fun main() {
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/* Initialize double-ended queue */
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val deque = LinkedList<Int>()
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deque.offerLast(3)
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deque.offerLast(2)
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deque.offerLast(5)
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println("Double-ended queue deque = $deque")
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/* Access element */
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val peekFirst = deque.peekFirst()
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println("Front element peekFirst = $peekFirst")
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val peekLast = deque.peekLast()
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println("Back element peekLast = $peekLast")
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/* Element enqueue */
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deque.offerLast(4)
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println("Element 4 enqueued at the back, deque = $deque")
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deque.offerFirst(1)
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println("Element 1 enqueued at the front, deque = $deque")
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/* Element dequeue */
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val popLast = deque.pollLast()
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println("Back dequeue element = $popLast, deque after back dequeue = $deque")
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val popFirst = deque.pollFirst()
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println("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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val size = deque.size
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println("Double-ended queue length size = $size")
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/* Determine if the double-ended queue is empty */
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val isEmpty = deque.isEmpty()
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println("Is the double-ended queue empty = $isEmpty")
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} |