http://poj.org/problem?id=3934 #include <stdio.h> int dp[81][201]; int main() { int n,m,i,j,k; for(i=1;i<=80;i++){ for(j=0,k=i-1;j<k;j++) dp[i][j]=0; } dp[1][0]=1; dp[2][1]=2; dp[3][2]=4; dp[3][3]=2; for(i=4;i<=80;i++){ for(j=i-1;j<=200;j++){ dp[i][j]=0; if(j>=2) dp[i][j]=(dp[i-1][j-2]*(i-2))%9937; if(j>=1) dp[i][j]=(dp[i][j]+dp[i-1][j-1]*2)%9937; } } while(scanf("%d%d",&n,&m),n||m){ if(m>=200) printf("0n"); else printf("%dn",dp[n][m]); } return 0; }
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