Submission #19966

#	Time	Username	Problem	Language	Result	Execution time	Memory
19966		algoshipda	창문 (kriii4_C)	C++14	3 / 100	0 ms	1720 KiB

C

#include <bits/stdc++.h>
using namespace std;

typedef long long lld;
const int MOD = 1e9 + 7;
const int MN = 1e6 + 10;
int fpow(int n, int k)
{
	if(k == 0) return 1;
	if(k % 2){
		return 1ll * n * fpow(n, k - 1) % MOD;
	}
	int h = fpow(n, k / 2);
	return 1ll * h * h % MOD;
}

inline int inv(int n)
{
	return 1ll * fpow(n, MOD - 2) % MOD;
}

inline void mult(int& a, int b)
{
	a = 1ll * a * b % MOD;
}

inline int mult2(int a, int b)
{
	return 1ll * a * b % MOD;
}

inline void sub(int& a, int b)
{
	a = ((a - b) % MOD + MOD) % MOD;
}

inline int rational(int a, int b)
{
	return 1ll * a * inv(b) % MOD;
}

inline void add(int &a, int b)
{
	a = ((a + b) % MOD + MOD) % MOD;
}

inline int add2(int a, int b)
{
	return ((a + b) % MOD + MOD) % MOD;
}

int nCr(int n, int r)
{
	int ans = 1;
	for(int i = 1; i <= r; ++i){
		mult(ans, inv(i));
		mult(ans, n - i + 1);
	}
	return ans;
}
int main()
{
	lld h, w;
	cin >> h >> w;
	h %= MOD;
	w %= MOD;
	int b = mult2(mult2(mult2(h,h+1), mult2(w,w+1)), inv(4));
	int hh = h;
	mult(hh, h+1);
	mult(hh, h+2);
	mult(hh, inv(6));
	int ww = w;
	mult(ww, w+1);
	mult(ww, w+2);
	mult(ww, inv(6));
	int a = mult2(hh,ww);
	mult(a, 9);
	cout << mult2(a, inv(b)) << '\n';
}

• Subtask 1: 3 / 3
• Subtask 2: 0 / 97