제출 #717999

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
717999		Radin_Zahedi2	송금 (JOI19_remittance)	C++17	100 / 100	427 ms	28584 KiB

remittance

#include<bits/stdc++.h>
#pragma GCC optimize("O2")
using namespace std;
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define sz(x) (int)x.size()
#define endl '\n'


int n;
const int N = 1e6 + 5;
int a[N];
int b[N];

void input() {
	cin >> n;
	
	for (int i = 0; i < n; i++) {
		cin >> a[i] >> b[i];
	}
}

int cgive(int i) {
	int d = a[i] - b[i];

	if (d % 2 == 0) {
		return d / 2;
	}
	if (a[i] >= d + 1) {
		return (d + 1) / 2;
	}

	return (d - 1) / 2;
}

void give(int i, int x) {
	int ne = i + 1;
	if (ne == n) {
		ne = 0;
	}

	a[i] -= 2 * x;
	a[ne] += x;
}

void solve() {
	for (int t = 0; t < 60; t++) {
		for (int i = 0; i < n; i++) {
			if (a[i] > b[i]) {
				give(i, cgive(i));
			}
		}
	}

	for (int i = 0; i < n; i++) {
		if (a[i] != b[i]) {
			cout << "No";
			return;
		}
	}

	cout << "Yes";
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);


	input();

	solve();

	return 0;
}

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