Submission #799620

#	Time	Username	Problem	Language	Result	Execution time	Memory
799620		I_Love_EliskaM_	Hiring (IOI09_hiring)	C++14	100 / 100	263 ms	33576 KiB

hiring

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

#define int long long
#define forn(i,n) for(int i=0;i<n;++i)
//#define pi pair<int,int>
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define vii(a,n) vector<int>a(n);forn(i,n)cin>>a[i];

struct pi {
	int f,s,i;
	pi(int a, int b) {
		f=a,s=b,i=0;
	}
	pi(){}
};

bool foo(pi a, pi b) {
	return a.f*b.s < b.f*a.s;
}

void insert(vector<int>&v, int x) {
	if (!v.size() || x>=v.back()) {
		v.pb(x); return;
	}
	int i=0;
	while (x>v[i]) ++i;
	int t=x;
	while (i<v.size()) {
		int z=t;
		t=v[i];
		v[i]=z;
		++i;
	}
	v.pb(t);
}

bool zzz(pi a, pi b) {
	return a.f<b.f;
}

void solve() {

	int n,w; cin>>n>>w; 

	vector<pi> a(n); forn(i,n) { cin>>a[i].f>>a[i].s; a[i].i=i;}
	sort(all(a),foo);

	int ans=-1, best; pi frac;

	int sum=0;
	priority_queue<int> q;
	forn(i,n) {
		sum+=a[i].s;
		q.push(a[i].s);
		while (sum*a[i].f > w*a[i].s) {
			sum-=q.top(); q.pop();
		}
		if ((int)(q.size()) > ans) {
			ans=q.size();
			best=i;
			frac = { sum*a[i].f, a[i].s };
		}
		if ((int)(q.size()) == ans) {
			if ( sum*a[i].f*frac.s < frac.f*a[i].s ) {
				best=i;
				frac = { sum*a[i].f, a[i].s };
			}
		}
	}

	cout<<ans<<'\n';
	vector<pi> z;
	forn(i,best+1) z.pb({a[i].s,a[i].i});
	sort(all(z),zzz);
	sum=0;
	int i=best;
	vector<int> ok;
	forn(j,i+1) {
		int x = (sum+z[j].f)*a[i].f;
		int y = a[i].s;
		if (foo( {w,1}, {x,y} )) break;
		sum+=z[j].f;
		ok.pb(z[j].s);
	}
	sort(all(ok));
	for(auto&x:ok) cout<<x+1<<'\n';

}

int32_t main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	solve();
}

Compilation message (stderr)

hiring.cpp: In function 'void insert(std::vector<long long int>&, long long int)':
hiring.cpp:32:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  while (i<v.size()) {
      |         ~^~~~~~~~~
hiring.cpp: In function 'void solve()':
hiring.cpp:83:27: warning: 'best' may be used uninitialized in this function [-Wmaybe-uninitialized]
   83 |   int x = (sum+z[j].f)*a[i].f;
      |                           ^
hiring.cpp:68:35: warning: 'frac.pi::first' may be used uninitialized in this function [-Wmaybe-uninitialized]
   68 |    if ( sum*a[i].f*frac.s < frac.f*a[i].s ) {
      |                                   ^
hiring.cpp:68:19: warning: 'frac.pi::second' may be used uninitialized in this function [-Wmaybe-uninitialized]
   68 |    if ( sum*a[i].f*frac.s < frac.f*a[i].s ) {
      |                   ^

• Subtask 1: 30 / 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