Submission #490717

#	Time	Username	Problem	Language	Result	Execution time	Memory
490717		ntabc05101	Hiring (IOI09_hiring)	C++14	60 / 100	317 ms	15032 KiB

hiring

#include<bits/stdc++.h>
using namespace std;

#define taskname ""

int main() {
	if (fopen(taskname".inp", "r")) {
		freopen(taskname".inp", "r", stdin);
		freopen(taskname".out", "w", stdout);
	}
	else {
		if (fopen(taskname".in", "r")) {
			freopen(taskname".in", "r", stdin);
			freopen(taskname".out", "w", stdout);
		}
	}

	cin.tie(0)->sync_with_stdio(0);

	int n; long long w; cin >> n >> w;
	struct Sal {
		int s, q; double r;
		int idx;
		bool operator < (const Sal &other) {
			return r < other.r;
		}
	};
	Sal a[n];
	for (int i = 0; i < n; i++) {
		cin >> a[i].s >> a[i].q;
		a[i].r = 1. * a[i].s / a[i].q;
		a[i].idx = i;
	}

	sort(a, a + n);
	long long cur = 0;
	priority_queue< array<int, 2> > pq;
	int res = 0;
	int j = 0;
	for (int i = 0; i < n; i++) {
		pq.push({a[i].q, 0});
		cur += a[i].q;
		while (a[i].r * cur > w) {
			cur -= pq.top()[0]; pq.pop();
		}
		if (res < (int)pq.size()) {
			res = pq.size(); j = i;
		}
	}

	cout << res << "\n";
	while (!pq.empty()) {
		pq.pop();
	}
	cur = 0;
	for (int i = 0; i <= j; i++) {
		pq.push({a[i].q, a[i].idx});
		cur += a[i].q;
		while (a[i].r * cur > w) {
			cur -= pq.top()[0]; pq.pop();
		}
	}
	while (!pq.empty()) {
		cout << 1 + pq.top()[1] << "\n"; pq.pop();
	}

	return 0;
}

Compilation message (stderr)

hiring.cpp: In function 'int main()':
hiring.cpp:8:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |   freopen(taskname".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
hiring.cpp:9:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |   freopen(taskname".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hiring.cpp:13:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |    freopen(taskname".in", "r", stdin);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
hiring.cpp:14:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |    freopen(taskname".out", "w", stdout);
      |    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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