Submission #991954

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Source Code Expand

#include<stdio.h>
#include<algorithm>
using namespace std;
long long mod=1000000007;
long long dp[310][310][310];
int main(){
	int a,b;scanf("%d%d",&a,&b);
	if(a>b){
		printf("0\n");
		return 0;
	}
	dp[0][0][1]=1;
	for(int i=0;i<b;i++){
		for(int j=0;j<=a;j++){
			for(int k=0;k<=a;k++){
				if(!dp[i][j][k])continue;
				dp[i+1][j+1][k]=(dp[i+1][j+1][k]+dp[i][j][k]*(a-j-k))%mod;
				dp[i+1][0][j+k]=(dp[i+1][0][j+k]+dp[i][j][k]*k)%mod;
				dp[i+1][j][k]=(dp[i+1][j][k]+dp[i][j][k]*(j))%mod;
			}
		}
	}
	printf("%lld\n",dp[b][0][a]);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:7:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  int a,b;scanf("%d%d",&a,&b);
                             ^

Judge Result