mirror of
https://github.com/krahets/hello-algo.git
synced 2024-12-27 01:46:31 +08:00
28 lines
515 B
Dart
28 lines
515 B
Dart
|
/**
|
||
|
|
* File: climbing_stairs_dfs.dart
|
||
|
|
* Created Time: 2023-08-11
|
||
|
|
* Author: liuyuxin (gvenusleo@gmail.com)
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* 搜尋 */
|
||
|
|
int dfs(int i) {
|
||
|
|
// 已知 dp[1] 和 dp[2] ，返回之
|
||
|
|
if (i == 1 || i == 2) return i;
|
||
|
|
// dp[i] = dp[i-1] + dp[i-2]
|
||
|
|
int count = dfs(i - 1) + dfs(i - 2);
|
||
|
|
return count;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* 爬樓梯：搜尋 */
|
||
|
|
int climbingStairsDFS(int n) {
|
||
|
|
return dfs(n);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Driver Code */
|
||
|
|
void main() {
|
||
|
|
int n = 9;
|
||
|
|
|
||
|
|
int res = climbingStairsDFS(n);
|
||
|
|
print("爬 $n 階樓梯共有 $res 種方案");
|
||
|
|
}
|