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https://github.com/krahets/hello-algo.git
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e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
58 lines
1.6 KiB
Swift
58 lines
1.6 KiB
Swift
/**
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* File: hanota.swift
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* Created Time: 2023-09-02
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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/* 移动一个圆盘 */
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func move(src: inout [Int], tar: inout [Int]) {
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// 从 src 顶部拿出一个圆盘
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let pan = src.popLast()!
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// 将圆盘放入 tar 顶部
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tar.append(pan)
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}
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/* 求解汉诺塔问题 f(i) */
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func dfs(i: Int, src: inout [Int], buf: inout [Int], tar: inout [Int]) {
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// 若 src 只剩下一个圆盘，则直接将其移到 tar
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if i == 1 {
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move(src: &src, tar: &tar)
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return
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}
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// 子问题 f(i-1) ：将 src 顶部 i-1 个圆盘借助 tar 移到 buf
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dfs(i: i - 1, src: &src, buf: &tar, tar: &buf)
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// 子问题 f(1) ：将 src 剩余一个圆盘移到 tar
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move(src: &src, tar: &tar)
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// 子问题 f(i-1) ：将 buf 顶部 i-1 个圆盘借助 src 移到 tar
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dfs(i: i - 1, src: &buf, buf: &src, tar: &tar)
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}
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/* 求解汉诺塔问题 */
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func solveHanota(A: inout [Int], B: inout [Int], C: inout [Int]) {
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let n = A.count
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// 列表尾部是柱子顶部
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// 将 src 顶部 n 个圆盘借助 B 移到 C
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dfs(i: n, src: &A, buf: &B, tar: &C)
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}
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@main
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enum Hanota {
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/* Driver Code */
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static func main() {
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// 列表尾部是柱子顶部
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var A = [5, 4, 3, 2, 1]
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var B: [Int] = []
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var C: [Int] = []
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print("初始状态下：")
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print("A = \(A)")
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print("B = \(B)")
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print("C = \(C)")
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solveHanota(A: &A, B: &B, C: &C)
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print("圆盘移动完成后：")
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print("A = \(A)")
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print("B = \(B)")
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print("C = \(C)")
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}
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}
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