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41 lines
1 KiB
Swift
41 lines
1 KiB
Swift
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/**
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* File: queue.swift
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* Created Time: 2023-01-11
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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@main
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enum Queue {
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/* Driver Code */
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static func main() {
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/* 初始化佇列 */
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// Swift 沒有內建的佇列類別，可以把 Array 當作佇列來使用
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var queue: [Int] = []
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/* 元素入列 */
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queue.append(1)
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queue.append(3)
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queue.append(2)
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queue.append(5)
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queue.append(4)
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print("佇列 queue = \(queue)")
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/* 訪問佇列首元素 */
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let peek = queue.first!
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print("佇列首元素 peek = \(peek)")
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/* 元素出列 */
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// 使用 Array 模擬時 pop 的複雜度為 O(n)
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let pool = queue.removeFirst()
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print("出列元素 pop = \(pool)，出列後 queue = \(queue)")
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/* 獲取佇列的長度 */
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let size = queue.count
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print("佇列長度 size = \(size)")
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/* 判斷佇列是否為空 */
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let isEmpty = queue.isEmpty
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print("佇列是否為空 = \(isEmpty)")
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}
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}
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