Submission #952048

#	Time	Username	Problem	Language	Result	Execution time	Memory
952048		Angus_Yeung	Hiring (IOI09_hiring)	C++11	60 / 100	297 ms	17868 KiB

hiring

#include <bits/stdc++.h>
#define val first
#define id second
#define pii pair<ll, ll>
typedef long long ll;
const ll MOD = 1000000007LL;
const ll INF = 1e15;
using namespace std;

struct worker {
	ll s, q, id;
};

ll n, w, sum;
pair<ll, long double> ans;
worker a[500010];
priority_queue<pii> q;

long double f(worker x) {
	return x.s*1.0/x.q;
}

int main() {
	cin.tie(0); cout.tie(0);
	ios::sync_with_stdio(0);
	
	cin >> n >> w;
	for (int i = 1; i <= n; i++) {
		cin >> a[i].s >> a[i].q;
		a[i].id = i;
	}
	sort(a+1, a+n+1, [&](worker x, worker y) -> bool {
		return f(x) < f(y);
	});
	
	sum = 0; ans = {0, 0};
	while (!q.empty()) q.pop();
	for (int i = 1; i <= n; i++) {
		q.push({a[i].q, a[i].id});
		sum += a[i].q;
		while (!q.empty() && f(a[i])*sum > w) {
			sum -= q.top().val;
			q.pop();
		}
		if ((ll)q.size() > ans.first) {
			ans = {(ll)q.size(), sum*f(a[i])};
		}
		else if ((ll)q.size() == ans.first && sum*f(a[i]) < ans.second) {
			ans = {(ll)q.size(), sum*f(a[i])};
		}
	}
	
	if (ans.first == 0) {
		cout << "0\n";
		return 0;
	}
	
	sum = 0;
	while (!q.empty()) q.pop();
	for (int i = 1; i <= n; i++) {
		q.push({a[i].q, a[i].id});
		sum += a[i].q;
		while (!q.empty() && f(a[i])*sum > w) {
			sum -= q.top().val;
			q.pop();
		}
		if (ans.first == (ll)q.size() && ans.second <= sum*f(a[i])) {
			cout << ans.first << "\n";
			while (!q.empty()) {
				cout << q.top().id << "\n";
				q.pop();
			}
			return 0;
		}
	}
	
	return 0;
}

• Subtask 1: 19 / 30
• Subtask 2: 20 / 28
• Subtask 3: 3 / 6
• Subtask 4: 3 / 6
• Subtask 5: 3 / 6
• Subtask 6: 3 / 6
• Subtask 7: 3 / 6
• Subtask 8: 3 / 6
• Subtask 9: 3 / 6