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27 lines
481 B
Ruby
27 lines
481 B
Ruby
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=begin
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File: climbing_stairs_dfs.rb
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Created Time: 2024-05-29
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Author: Xuan Khoa Tu Nguyen (ngxktuzkai2000@gmail.com)
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=end
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### 搜索 ###
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def dfs(i)
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# 已知 dp[1] 和 dp[2] ，返回之
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return i if i == 1 || i == 2
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# dp[i] = dp[i-1] + dp[i-2]
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dfs(i - 1) + dfs(i - 2)
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end
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### 爬楼梯：搜索 ###
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def climbing_stairs_dfs(n)
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dfs(n)
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end
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### Driver Code ###
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if __FILE__ == $0
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n = 9
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res = climbing_stairs_dfs(n)
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puts "爬 #{n} 阶楼梯共有 #{res} 种方案"
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end
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