93. [NOIP2001] 数的划分

 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstring>
 4 #include<cmath>
 5 using namespace std;
 6 int read(int & n)
 7 {
 8     int flag=0,x=0;char c='/';
 9     while(c<'0'||c>'9'){c=getchar();if(c=='-')flag=1;}
10     while(c>='0'&&c<='9')x=x*10+(c-48),c=getchar();
11     if(flag)n=-x;
12     else n=x;
13 }
14 int n,m;
15 int dp[201][7];
16 int main()
17 {
18     freopen("sdhf.in","r",stdin);
19     freopen("sdhf.out","w",stdout);
20     
21     read(n);read(m);
22     for(int i=1;i<=n;i++)
23         dp[i][1]=1;
24     
25     for(int i=2;i<=n;i++)
26         for(int j=1;j<=m;j++)
27             if(j<=i)
28                 dp[i][j]=dp[i-1][j-1]+dp[i-j][j];
29     cout<<dp[n][m];
30     return 0;
31 }