Submission #1939505

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Source Code Expand

#include<stdio.h>
#include<math.h>
#include<algorithm>
#include<queue>
#include<deque>
#include<string>
#include<string.h>
#include<vector>
#include<set>
#include<map>
#include<bitset>
#include<stdlib.h>
#include<cassert>
using namespace std;
const long long mod=1000000007;
const long long inf=mod*mod;
const long long d2=500000004;
const double EPS=1e-6;
const double PI=acos(-1.0);
int ABS(int a){return max(a,-a);}
long long ABS(long long a){return max(a,-a);}
long long fact[12100];
long long inv[12100];
long long finv[12100];
long long C(int a,int b){
	if(a<b)return 0;
	return fact[a]*finv[b]%mod*finv[a-b]%mod;
}
int main(){
	fact[0]=finv[0]=1;
	inv[1]=1;
	for(int i=2;i<12100;i++){
		inv[i]=(mod-(mod/i)*inv[mod%i]%mod)%mod;
	}
	for(int i=1;i<12100;i++){
		fact[i]=fact[i-1]*i%mod;
		finv[i]=finv[i-1]*inv[i]%mod;
	}
	int n,a,b,c;
	scanf("%d%d%d%d",&n,&a,&b,&c);
	if(b%2){
		printf("0\n");return 0;
	}
	long long ks=C(a+b/2,a);
	long long ret=0;
	if(b==0){
		for(int i=0;i<=c/3;i++){
			ret=(ret+C(a,c-i*3)*C(a+c/3,a))%mod;	
		}
	}else{
		for(int i=0;i<=c/3;i++){
			long long ks2=C(a+b/2+i,i);
			for(int j=0;j<=min(a,c-i*3);j++){
				long long tmp=C(a,j);
				int rem=c-i*3-j;
				ret=(ret+tmp*C(rem+b/2-1,rem)%mod*ks2)%mod;
			}
		}
	}
	ret=ret*ks%mod;
	printf("%lld\n",ret);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:40:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d",&n,&a,&b,&c);
                               ^

Judge Result