oj.uz

답안 #19490

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
19490 2016-02-24T14:09:59 Z noslaak Σ (kriii4_P2) C++
100 / 100
 16 ms 1720 KB 
#include <iostream>

const int LN = 1000000007;
int modpow( long long A, long long X )
{
	int acc = 1;
	while(X)
	{
		A %= LN;
		if(X%2)
			acc = (A*acc)%LN;
			
		A = A*A;
		X /= 2;
	}

	return acc;
}


int main()
{
	int M;
	std::cin >> M;
	{
		int N, S, acc = 0;
		for( int i = 0; i < M; ++i )
		{
			std::cin >> N >> S;
			int rev = modpow(N, LN-2);
			int ans = ((long long)S*rev)%LN;
			acc = (acc+ans)%LN;
		}
		std::cout << acc << std::endl;
	}

	return 0;
}

Subtask #1
100.0 / 100.0

# 결과 실행 시간 메모리 Grader output
1 Correct 14 ms 1720 KB Output is correct
2 Correct 11 ms 1720 KB Output is correct
3 Correct 10 ms 1720 KB Output is correct
4 Correct 14 ms 1720 KB Output is correct
5 Correct 12 ms 1720 KB Output is correct
6 Correct 10 ms 1720 KB Output is correct
7 Correct 14 ms 1720 KB Output is correct
8 Correct 10 ms 1720 KB Output is correct
9 Correct 13 ms 1720 KB Output is correct
10 Correct 0 ms 1720 KB Output is correct
11 Correct 14 ms 1720 KB Output is correct
12 Correct 14 ms 1720 KB Output is correct
13 Correct 14 ms 1720 KB Output is correct
14 Correct 8 ms 1720 KB Output is correct
15 Correct 13 ms 1720 KB Output is correct
16 Correct 16 ms 1720 KB Output is correct
17 Correct 11 ms 1720 KB Output is correct
18 Correct 15 ms 1720 KB Output is correct
19 Correct 13 ms 1720 KB Output is correct
20 Correct 13 ms 1720 KB Output is correct