답안 #19485

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
19485	2016-02-24T14:05:44 Z	zych1751	Σ (kriii4_P2)	C++	100 / 100	7 ms	1084 KB

P2

#include<cstdio>

const int INF = 1e9+7;

long long mod(long long a) // a^(x-2)
{
	int mul = 1e9+5;
	long long result = 1;
	a %= INF;

	while(mul)
	{
		if(mul & 1)
			result = (result * a) % INF;
		a = (a*a) % INF;
		mul /= 2;
	}
	return result;
}

int main()
{
	int m;
	long long n, s;
	long long result = 0;

	scanf("%d", &m);
	for(int i = 0; i < m; i++)
	{
		scanf("%lld %lld", &n, &s);
		result += s * mod(n);
		result %= INF;
	}
	printf("%lld", result);
}

Subtask #1

100.0 / 100.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	1084 KB	Output is correct
2	Correct	0 ms	1084 KB	Output is correct
3	Correct	0 ms	1084 KB	Output is correct
4	Correct	0 ms	1084 KB	Output is correct
5	Correct	0 ms	1084 KB	Output is correct
6	Correct	0 ms	1084 KB	Output is correct
7	Correct	0 ms	1084 KB	Output is correct
8	Correct	0 ms	1084 KB	Output is correct
9	Correct	5 ms	1084 KB	Output is correct
10	Correct	0 ms	1084 KB	Output is correct
11	Correct	6 ms	1084 KB	Output is correct
12	Correct	7 ms	1084 KB	Output is correct
13	Correct	6 ms	1084 KB	Output is correct
14	Correct	6 ms	1084 KB	Output is correct
15	Correct	0 ms	1084 KB	Output is correct
16	Correct	6 ms	1084 KB	Output is correct
17	Correct	7 ms	1084 KB	Output is correct
18	Correct	5 ms	1084 KB	Output is correct
19	Correct	0 ms	1084 KB	Output is correct
20	Correct	5 ms	1084 KB	Output is correct