Submission #6419254

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Source Code Expand

#include<stdio.h>

int mbk(long long a,int n,int m){
	int x=(mbk((a*a)%m,n/2,m)*(n%2?a:1))%m;
	return n?x: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(){
	long long n,m,s=1,M=1e9+7;
	scanf("%lld %lld",&n,&m);
	--m;
	if(n<0)n=-n;
	for(long long i=2;i*i<=n;++i){
		long long j;
		for(j=0;n%i==0;++j)n/=i;
		s=s*aCb(j+m,m,M)%M;
	}
	if(n-1)s=s*(m+1)%M;
	printf("%lld\n",(s*mbk(2,m,M))%M);
	return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:22:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld %lld",&n,&m);
                          ^

Judge Result