Submission #1595303

---

Source Code Expand

#include <stdio.h>
#define int long long
#define p (int)(1e9 + 7)

int MOD(int a){
	if(a >= 0){
		return a % p;
	}
	else{
		return p + a % p;
	}
}

int power(int a, int n){
	if(n == 0){
		return 1;
	}
	else if(n % 2 == 0){
		return power(MOD(a * a), n / 2);
	}
	else{
		return MOD(a * power(a, n - 1));
	}
}

int inverse(int a){
	return power(a, p - 2);
}

int comb(int n, int k){
	int numerator, denominator;
	for(numerator = 1, denominator = 1; k > 0; n--, k--){
		numerator = MOD(numerator * n);
		denominator = MOD(denominator * k);
	}
	return MOD(numerator * inverse(denominator));
}

signed main(){
	int N, K;
	scanf("%lld%lld", &N, &K);
	if(N > K){
		printf("%lld\n", comb(N + K - 1, K));
	}
	else{
		printf("%lld\n", comb(N, K % N));
	}
	return 0;
}

Submission Info

Compile Error

./Main.c: In function ‘main’:
./Main.c:41:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld%lld", &N, &K);
  ^

Judge Result