mirror of
https://github.com/krahets/hello-algo.git
synced 2025-11-04 14:18:20 +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
55 lines
1.3 KiB
Dart
55 lines
1.3 KiB
Dart
/**
|
|
* File: hanota.dart
|
|
* Created Time: 2023-08-10
|
|
* Author: liuyuxin (gvenusleo@gmail.com)
|
|
*/
|
|
|
|
/* 移动一个圆盘 */
|
|
void move(List<int> src, List<int> tar) {
|
|
// 从 src 顶部拿出一个圆盘
|
|
int pan = src.removeLast();
|
|
// 将圆盘放入 tar 顶部
|
|
tar.add(pan);
|
|
}
|
|
|
|
/* 求解汉诺塔问题 f(i) */
|
|
void dfs(int i, List<int> src, List<int> buf, List<int> tar) {
|
|
// 若 src 只剩下一个圆盘，则直接将其移到 tar
|
|
if (i == 1) {
|
|
move(src, 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 - 1, src, tar, buf);
|
|
// 子问题 f(1) ：将 src 剩余一个圆盘移到 tar
|
|
move(src, tar);
|
|
// 子问题 f(i-1) ：将 buf 顶部 i-1 个圆盘借助 src 移到 tar
|
|
dfs(i - 1, buf, src, tar);
|
|
}
|
|
|
|
/* 求解汉诺塔问题 */
|
|
void solveHanota(List<int> A, List<int> B, List<int> C) {
|
|
int n = A.length;
|
|
// 将 A 顶部 n 个圆盘借助 B 移到 C
|
|
dfs(n, A, B, C);
|
|
}
|
|
|
|
/* Driver Code */
|
|
void main() {
|
|
// 列表尾部是柱子顶部
|
|
List<int> A = [5, 4, 3, 2, 1];
|
|
List<int> B = [];
|
|
List<int> C = [];
|
|
print("初始状态下：");
|
|
print("A = $A");
|
|
print("B = $B");
|
|
print("C = $C");
|
|
|
|
solveHanota(A, B, C);
|
|
|
|
print("圆盘移动完成后：");
|
|
print("A = $A");
|
|
print("B = $B");
|
|
print("C = $C");
|
|
}
|