Submission #497268

#	Time	Username	Problem	Language	Result	Execution time	Memory
497268		Hanksburger	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	695 ms	76184 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
priority_queue<pair<long long, long long> > pq;
pair<long long, long long> CNT[1505];
vector<vector<int> > ans;
long long cnt[1505];
bool chosen[1505];
vector<int> tmp;
long long find_maximum(int K, vector<vector<int> > X)
{
	long long N=X.size(), M=X[0].size(), sum=0;
	for (long long i=0; i<N; i++)
		for (long long j=0; j<K; j++)
			sum-=X[i][j];
	for (long long i=0; i<N; i++)
		pq.push({X[i][K-1]+X[i][M-1], i});
	for (long long i=0; i<N*K/2; i++)
	{
		long long p=pq.top().first, q=pq.top().second;
		pq.pop();
		sum+=p;
		cnt[q]++;
		if (cnt[q]<K)
			pq.push({X[q][K-cnt[q]-1]+X[q][M-cnt[q]-1], q});
	}
	for (long long i=0; i<N; i++)
	{
		tmp.clear();
		for (long long j=0; j<M; j++)
			tmp.push_back(-1);
		ans.push_back(tmp);
	}
	for (long long i=0; i<N; i++)
		CNT[i]={cnt[i], i};
	for (long long i=0; i<K; i++)
	{
		for (long long j=0; j<N; j++)
			chosen[j]=0;
		sort(CNT, CNT+N, greater<pair<long long, long long> >());
		for (long long j=0; j<N/2; j++)
		{
			long long q=CNT[j].second;
			chosen[q]=1;
			ans[q][M-cnt[q]]=i;
			cnt[q]--;
			CNT[j].first--;
		}
		for (long long j=0; j<N; j++)
			if (!chosen[j])
				ans[j][K-i-cnt[j]-1]=i;
	}
	allocate_tickets(ans);
	return sum;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 10 / 10