Submission #748997

#	Time	Username	Problem	Language	Result	Execution time	Memory
748997		myrcella	Hiring (IOI09_hiring)	C++17	99 / 100	328 ms	14548 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;

void solve() {
	while (!q.empty()) q.pop();
	ll tmp = 0;
	int hi = -1,pos;
	double val = 1e18;
	rep(i,0,n) {
		q.push({worker[i].se,i}),tmp += worker[i].se;
		while (tmp * worker[i].fi > m*worker[i].se) tmp -= q.top().first, q.pop();
		if (SZ(q) > hi or (SZ(q)==hi and val > tmp*worker[i].fi/worker[i].se)) hi = SZ(q),pos = i,val = tmp*worker[i].fi/worker[i].se;
	}
	while (!q.empty()) q.pop();
	tmp = 0;
	rep(i,0,pos+1) {
		q.push({worker[i].se,i}),tmp += worker[i].se;
		while (tmp * worker[i].fi > m*worker[i].se) tmp -= q.top().first, q.pop();
	}
	cout<<hi<<"\n";
	while (!q.empty()) cout<<worker[q.top().second].id<<"\n",q.pop();
}

bool check(int cnt, bool hi) {
	
	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);
	solve();
}
/*
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 'void solve()':
hiring.cpp:28:14: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   28 |  int hi = -1,pos;
      |              ^~~

• Subtask 1: 29 / 30
• Subtask 2: 28 / 28
• Subtask 3: 6 / 6
• Subtask 4: 6 / 6
• Subtask 5: 6 / 6
• Subtask 6: 6 / 6
• Subtask 7: 6 / 6
• Subtask 8: 6 / 6
• Subtask 9: 6 / 6