mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-26 11:06:28 +08:00
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
/**
|
||
* File: hanota.swift
|
||
* Created Time: 2023-09-02
|
||
* Author: nuomi1 (nuomi1@qq.com)
|
||
*/
|
||
|
||
/* 移动一个圆盘 */
|
||
func move(src: inout [Int], tar: inout [Int]) {
|
||
// 从 src 顶部拿出一个圆盘
|
||
let pan = src.popLast()!
|
||
// 将圆盘放入 tar 顶部
|
||
tar.append(pan)
|
||
}
|
||
|
||
/* 求解汉诺塔问题 f(i) */
|
||
func dfs(i: Int, src: inout [Int], buf: inout [Int], tar: inout [Int]) {
|
||
// 若 src 只剩下一个圆盘，则直接将其移到 tar
|
||
if i == 1 {
|
||
move(src: &src, tar: &tar)
|
||
return
|
||
}
|
||
// 子问题 f(i-1) ：将 src 顶部 i-1 个圆盘借助 tar 移到 buf
|
||
dfs(i: i - 1, src: &src, buf: &tar, tar: &buf)
|
||
// 子问题 f(1) ：将 src 剩余一个圆盘移到 tar
|
||
move(src: &src, tar: &tar)
|
||
// 子问题 f(i-1) ：将 buf 顶部 i-1 个圆盘借助 src 移到 tar
|
||
dfs(i: i - 1, src: &buf, buf: &src, tar: &tar)
|
||
}
|
||
|
||
/* 求解汉诺塔问题 */
|
||
func solveHanota(A: inout [Int], B: inout [Int], C: inout [Int]) {
|
||
let n = A.count
|
||
// 列表尾部是柱子顶部
|
||
// 将 src 顶部 n 个圆盘借助 B 移到 C
|
||
dfs(i: n, src: &A, buf: &B, tar: &C)
|
||
}
|
||
|
||
@main
|
||
enum Hanota {
|
||
/* Driver Code */
|
||
static func main() {
|
||
// 列表尾部是柱子顶部
|
||
var A = [5, 4, 3, 2, 1]
|
||
var B: [Int] = []
|
||
var C: [Int] = []
|
||
print("初始状态下：")
|
||
print("A = \(A)")
|
||
print("B = \(B)")
|
||
print("C = \(C)")
|
||
|
||
solveHanota(A: &A, B: &B, C: &C)
|
||
|
||
print("圆盘移动完成后：")
|
||
print("A = \(A)")
|
||
print("B = \(B)")
|
||
print("C = \(C)")
|
||
}
|
||
}
|