mirror of
https://github.com/krahets/hello-algo.git
synced 2026-11-01 05:05:03 +08:00
41 lines
1.0 KiB
Swift
41 lines
1.0 KiB
Swift
/**
|
||
* File: queue.swift
|
||
* Created Time: 2023-01-11
|
||
* Author: nuomi1 (nuomi1@qq.com)
|
||
*/
|
||
|
||
@main
|
||
enum Queue {
|
||
/* Driver Code */
|
||
static func main() {
|
||
/* 初始化佇列 */
|
||
// Swift 沒有內建的佇列類別，可以把 Array 當作佇列來使用
|
||
var queue: [Int] = []
|
||
|
||
/* 元素入列 */
|
||
queue.append(1)
|
||
queue.append(3)
|
||
queue.append(2)
|
||
queue.append(5)
|
||
queue.append(4)
|
||
print("佇列 queue = \(queue)")
|
||
|
||
/* 訪問佇列首元素 */
|
||
let peek = queue.first!
|
||
print("佇列首元素 peek = \(peek)")
|
||
|
||
/* 元素出列 */
|
||
// 使用 Array 模擬時 pop 的複雜度為 O(n)
|
||
let pop = queue.removeFirst()
|
||
print("出列元素 pop = \(pop)，出列後 queue = \(queue)")
|
||
|
||
/* 獲取佇列的長度 */
|
||
let size = queue.count
|
||
print("佇列長度 size = \(size)")
|
||
|
||
/* 判斷佇列是否為空 */
|
||
let isEmpty = queue.isEmpty
|
||
print("佇列是否為空 = \(isEmpty)")
|
||
}
|
||
}
|