URAL1017. Staircases

链接

简单递推

 1 #include <iostream>

 2 #include<cstdio>

 3 #include<cstring>

 4 #include<algorithm>

 5 #include<stdlib.h>

 6 using namespace std;

 7 #define LL long long

 8 LL dp[510][510];

 9 int main()

10 {

11     int i,j,n,g;

12     LL ans=0;

13     scanf("%d",&n);

14     for(i = 1; i <= n ;i++)

15     dp[i][i] = 1;

16     for(i = 1; i <= n ;i++)

17     {

18         for(j = 1 ; j < i ; j++)

19         {

20             for(g = 1 ; g < j ; g++)

21             dp[i][j]+=dp[i-j][g];

22         }

23     }

24     for(i = 1; i < n ;i++)

25     ans+=dp[n][i];

26     printf("%lld\n",ans);

27     return 0;

28 }

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