Submission #1087367

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Source Code Expand

#include<stdio.h>
int A, B, C;
long long Mod = 1000000007, F[5010], InvF[5010], Res;
long long Pow(long long a, int b){
    long long r = 1;
    while(b){
        if(b&1)r=r*a%Mod;
        a=a*a%Mod;b>>=1;
    }
    return r;
}
int main(){
    int n;
    scanf("%d%d%d%d",&n,&A,&B,&C);
    int i, j;
    F[0]=InvF[0]=1;
    for(i=1;i<=5000;i++){
        F[i]=F[i-1]*i%Mod;
        InvF[i]=Pow(F[i],Mod-2);
    }
    if(B%2){
        printf("0\n");
        return 0;
    }
    for(i=0;i<=A;i++){
        for(j=0;A-i+3*j<=C;j++){
            int s = C - (A-i+3*j);
            Res = (Res +F[A+j+B/2] * InvF[i] % Mod * InvF[j] % Mod * InvF[A-i] % Mod * InvF[B/2] % Mod * F[B/2+s-1] % Mod * InvF[s] % Mod * InvF[B/2-1])%Mod;
        }
    }
    printf("%lld\n",Res);
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:14:34: 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