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30 lines
575 B
30 lines
575 B
/*
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* File: climbing_stairs_dfs.rs
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* Created Time: 2023-07-09
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* Author: codingonion (coderonion@gmail.com)
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*/
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/* 搜尋 */
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fn dfs(i: usize) -> i32 {
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// 已知 dp[1] 和 dp[2] ，返回之
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if i == 1 || i == 2 {
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return i as i32;
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}
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// dp[i] = dp[i-1] + dp[i-2]
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let count = dfs(i - 1) + dfs(i - 2);
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count
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}
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/* 爬樓梯：搜尋 */
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fn climbing_stairs_dfs(n: usize) -> i32 {
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dfs(n)
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}
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/* Driver Code */
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pub fn main() {
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let n: usize = 9;
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let res = climbing_stairs_dfs(n);
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println!("爬 {n} 階樓梯共有 {res} 種方案");
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}
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