Submission #748821

#	Time	Username	Problem	Language	Result	Execution time	Memory
748821		myrcella	Hiring (IOI09_hiring)	C++17	65 / 100	1408 ms	10068 KiB

hiring

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

#define fi first.first
#define se first.second
#define id second
#define pb push_back
#define pii pair<int,int>
#define ll long long
#define pll pair<ll,ll>
#define rep(i,a,b) for (int i=(a);i<(b);i++)
#define SZ(x) ((int)((x).size()))
const int maxn = 5e5+10;

int n;
ll m;
pair<pii,int> worker[maxn];

bool cmp(pair<pii,int> x, pair<pii,int> y) {
	return x.fi*y.se < y.fi*x.se;
}

priority_queue <pii> q;

bool check(int cnt, bool hi) {
	while (!q.empty()) q.pop();
	ll tmp = 0;
	vector <int> ans;
	pii val = {-1,-1};
	rep(i,0,n) {
		q.push({worker[i].se,i}),tmp += worker[i].se;
		if (SZ(q) > cnt) tmp -= q.top().first, q.pop();
		if (SZ(q) == cnt) {
			if (tmp * worker[i].fi <= m * worker[i].se) {
				if (hi) {
					if (val.first==-1) val = {tmp,i};
					else if (val.first * worker[val.second].fi * worker[i].se > tmp * worker[i].fi * worker[val.second].se) val = {tmp,i};
				}
				else return true;
			}
		}
	}
	while (!q.empty()) q.pop();
	if (val.first!=-1) {
		rep(i,0,val.second+1) {
			q.push({worker[i].se,i}),tmp += worker[i].se;
			if (SZ(q) > cnt) tmp -= q.top().first, q.pop();
		}
		while (!q.empty()) cout<<worker[q.top().second].id<<"\n",q.pop();
	}
	return false;
}

int main() {
	std::ios::sync_with_stdio(false);cin.tie(0);
	cin>>n>>m;
	rep(i,0,n) {
		cin>>worker[i].fi>>worker[i].se;
		worker[i].id = i+1;
	}
	sort(worker,worker+n,cmp);
	int l = 0, r = n;
	while (l<r) {
		int mid = l+r+1>>1;
		if (check(mid,false)) l = mid;
		else r = mid-1;
	}
	cout<<l<<"\n";
	check(l,true);
}
/*
4 100 5 1000 10 100 8 10 20 1
3 4 1 2 1 3 1 3
3 40 10 1 10 2 10 3
*/

Compilation message (stderr)

hiring.cpp: In function 'int main()':
hiring.cpp:64:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   64 |   int mid = l+r+1>>1;
      |             ~~~^~

• Subtask 1: 22 / 30
• Subtask 2: 22 / 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