Submission #1274663

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Source Code Expand

#include<stdio.h>
int mbk(long long a,int n,int m){return n?(mbk((a*a)%m,n/2,m)*(n%2?a:1))%m:1;}
int inv(int a,int m){return mbk((long long)a,m-2,m);}
int aCb(int a,int b,int m){
  long long s=1,i;
  if(b>a-b)b=a-b;
  for(i=0;i<b;i++)s=(((s*(a-i))%m)*inv(i+1,m))%m;  
  return (int)s;
}
int main(){
	int a,b;
	scanf("%d %d",&a,&b);
	printf("%d\n",aCb(a+b-1,b,1e9+7));
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:12:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d",&a,&b);
  ^

Judge Result