Submission #19412

#	Time	Username	Problem	Language	Result	Execution time	Memory
19412		ekfrl0526	Σ (kriii4_P2)	C++14	100 / 100	11 ms	1720 KiB

P2

#include<bits/stdc++.h>
using namespace std;
const long long divs = 1000000007;
vector<long long> as;
void initial(long long a) {
	long long ia = a;;
	for (int i = 0; i < 64; i++) {
		if (ia >= divs) ia = ia%divs;
		as.push_back(ia);
		ia *= ia;
	}
}

int main() {
	int n;
	long long ans = 0;
	scanf("%d ", &n);
	while (n--) {
		as.clear();
		long long a, b;
		long long x = divs - 2;
		scanf("%lld %lld", &b, &a);
		initial(b);
		int c = 0;
		long long result = 1;
		while (x > 0) {
			if (x % 2 == 1) {
				result *= as[c];
				result %= divs;
			}
			x /= 2;
			c++;
		}
		result *= a % divs;
		result %= divs;
		ans += result;
		ans %= divs;
	}

	cout << ans << endl;
}

• Subtask 1: 100 / 100