Submission #432076

#	Time	Username	Problem	Language	Result	Execution time	Memory
432076		OkMaybe	Remittance (JOI19_remittance)	C++14	100 / 100	909 ms	24804 KiB

remittance

/*input
2
1 1
2 2
*/
#pragma GCC optimize ("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef long double ld;
int main()
{
	clock_t pradzia = clock();
	ios_base::sync_with_stdio(false);
	int n;
	cin >> n;
	ll a[n], b[n];
	for (int i = 0; i < n; i++)
		cin >> a[i] >> b[i];
	while ((clock() - pradzia) * 10 <= 9 * CLOCKS_PER_SEC)
	{
		bool ok = true;
		for (int i = n - 1; i >= 0; i--)
		{
			if (a[i] < b[i])
			{
				ll c = min(a[(i - 1 + n) % n] / 2, b[i] - a[i]);
				a[i] += c;
				a[(i - 1 + n) % n] -= 2 * c;
				ok = false;
			}
		}
		for (int i = 0; i < n; i++)
		{
			if (a[i] > b[i])
			{
				ll c = min(a[i] / 2, (a[i] - b[i] + 1) / 2);
				a[i] -= c * 2;
				a[(i + 1) % n] += c;
				ok = false;
			}
		}
		if (ok)
		{
			cout << "Yes\n";
			return 0;
		}
	}
	cout << "No\n";
}

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