Submission #906609

#	Time	Username	Problem	Language	Result	Execution time	Memory
906609		mickey080929	Remittance (JOI19_remittance)	C++17	100 / 100	295 ms	16512 KiB

remittance

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

ll A[1000010];
ll B[1000010];

int main() {
	ios_base :: sync_with_stdio(false); 
	cin.tie(NULL); 
	ll N;
	cin >> N;
	for (ll i=0; i<N; i++) {
		cin >> A[i] >> B[i];
	}
	for (ll loop=0; loop<30; loop++) {
		for (ll i=0; i<N; i++) {
			if (B[i] < A[i]) {
				ll t = (A[i] - B[i]) / 2;
				A[i] -= t * 2;
				A[(i+1)%N] += t;
			}
		}
	}
	bool diff = false, notone = false;
	for (ll i=0; i<N; i++) {
		if (A[i] != B[i]) {
			diff = true;
		}
		if (A[i] != 1) notone = true;
	}
	if (!diff)
		cout << "Yes\n";
	else if (!notone)
		cout << "No\n";
	else {
		for (ll i=0; i<N; i++) {
			if (A[i] - 1 != B[i]) {
				cout << "No\n";
				return 0;
			}
		}
		cout << "Yes\n";
	}

	return 0;
}

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