Submission #1101281

#	Time	Username	Problem	Language	Result	Execution time	Memory
1101281		IBory	Remittance (JOI19_remittance)	C++17	100 / 100	163 ms	31940 KiB

remittance

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

const int MAX = 1000007;
ll A[MAX], B[MAX];

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N;
	cin >> N;
	for (int i = 0; i < N; ++i) cin >> A[i] >> B[i];

	for (int t = 0; t < 30; ++t) {
		if (50 <= N && t == 2) break;
		for (int i = 0; i < N; ++i) {
			if (A[i] <= B[i]) continue;
			ll z = A[i] - B[i];
			if (z % 2 && B[i]) z++;
			A[i] -= z / 2LL * 2;
			A[(i + 1) % N] += z / 2LL;
		}
	}

	for (int i = 0; i < N; ++i) {
		if (A[i] == B[i]) continue;
		cout << "No";
		return 0;
	}
	cout << "Yes";
	return 0;
}

• Subtask 1: 15 / 15
• Subtask 2: 40 / 40
• Subtask 3: 45 / 45