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Yudong Jin
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27 lines
506 B
Ruby
27 lines
506 B
Ruby
=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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### 探索 ###
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def dfs(i)
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# dp[1] と dp[2] は既知なので返す
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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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### 階段登り：探索 ###
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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 "#{n} 段の階段を上る方法は全部で #{res} 通り"
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end
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