Submission #455296

#	Time	Username	Problem	Language	Result	Execution time	Memory
455296		armand	Fountain (eJOI20_fountain)	C++14	60 / 100	1571 ms	2532 KiB

fountain

#include <iostream>
#include <algorithm>
using namespace std;

const int N = 100005;
int d[N], c[N];
int n, q;
long long pref[N];

bool is_increasing()
{
	int i;
	for (i = 2; i <= n; i++)
		if (d[i] <= d[i - 1])
			return false;
	return true;
}

void solve2()
{
	int i;
	int r, w;
	pref[1] = c[1];
	for (i = 2; i <= n; i++)
		pref[i] = pref[i - 1] + c[i];
	while (q--) {
		cin >> r >> w;
		long long* pt = lower_bound(pref, pref + n + 1, w + pref[r - 1]);
		int res = pt - pref;
		if (res <= n)
			cout << res << endl;
		else
			cout << 0 << endl;
	}
}

int main()
{
	int i;
	int r, v;
	cin >> n >> q;
	for (i = 1; i <= n; i++)
		cin >> d[i] >> c[i];
	if (is_increasing()) {
		solve2();
//		system("pause");
		return 0;
	}
	while (q--) {
		cin >> r >> v;
		if (v <= c[r]) {
			cout << r << endl;
			continue;
		}
		i = r + 1;
		v -= c[r];
		while (i <= n) {
			if (d[i] > d[r]) {
				if (v <= c[i]) {
					cout << i << endl;
					break;
				}
				else {
					v -= c[i];
					r = i;
					i++;
				}
			}
			else
				i++;
		}
		if (i > n)
			cout << 0 << endl;
	}
//	system("pause");
	return 0;
}

• Subtask 1: 30 / 30
• Subtask 2: 30 / 30
• Subtask 3: 0 / 40