Submission #1846760

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Source Code Expand

#include <bits/stdc++.h>
#ifdef DEMETRIO
#define deb(...) fprintf(stderr,__VA_ARGS__)
#define deb1(x) cerr << #x << " = " << x << endl
#else
#define deb(...) 0
#define deb1(x) 0
#endif
#define pb push_back
#define mp make_pair
#define fst first
#define snd second
#define fore(i,a,b) for(int i=a,ThxDem=b;i<ThxDem;++i)
#define SZ(x) ((int)x.size())
#define MOD 1000000007
using namespace std;
typedef long long ll;

int n,m;
int dp[302][302][302];

int f(int m, int k, int b){
	if(dp[m][k][b]>=0)return dp[m][k][b];
	int r=0;
	if(m==0)r=!k&&!b;
	else {
		r=(1LL*(n-k)*f(m-1,k-b,0))%MOD;
		r+=(1LL*b*f(m-1,k,b))%MOD;r%=MOD;
		if(k-b){r+=(1LL*(k-b)*f(m-1,k,b+1))%MOD;r%=MOD;}
	}
	return dp[m][k][b]=r;
}

int main(){
	scanf("%d%d",&n,&m);
	memset(dp,-1,sizeof(dp));
	printf("%d\n",f(m,n-1,0));
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:35:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d",&n,&m);
                     ^

Judge Result