Submission #1230807

#	Time	Username	Problem	Language	Result	Execution time	Memory
1230807		PlayVoltz	Carnival Tickets (IOI20_tickets)	C++20	27 / 100	363 ms	86924 KiB

tickets

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

#define pii pair<int, int>
#define mp make_pair
#define pb push_back
#define fi first
#define se second

long long find_maximum(int k, vector<vector<int> > x){
	int n=x.size(), m=x[0].size();
	long long res=0;
	vector<int> l(n, k-1), r(n, m-1);
	vector<vector<int> > ans(n, vector<int>(m, -1)), t(n, vector<int>(m, 0)), got(n, vector<int>(m, 0));
	vector<vector<pii> > vect(n, vector<pii>(m));
	priority_queue<pii> pq;
	for (int i=0; i<n; ++i){
		for (int j=0; j<m; ++j)vect[i][j]=mp(x[i][j], j);
		sort(vect[i].begin(), vect[i].end());
		for (int j=0; j<k; ++j)res-=vect[i][j].fi, t[i][vect[i][j].se]=-1;
		pq.push(mp(vect[i][l[i]].fi+vect[i][r[i]].fi, i));
	}
	for (int i=0; i<n*k/2; ++i){
		pii c=pq.top();
		pq.pop();
		res+=c.fi;
		t[c.se][vect[c.se][l[c.se]].se]=0;
		t[c.se][vect[c.se][r[c.se]].se]=1;
		--l[c.se];
		--r[c.se];
		if (l[c.se]>=0)pq.push(mp(vect[c.se][l[c.se]].fi+vect[c.se][r[c.se]].fi, c.se));
	}
	vector<pair<int, pii> > low, high;
	for (int i=0; i<n; ++i)for (int j=0; j<m; ++j){
		if (t[i][j]==-1)low.pb(mp(x[i][j], mp(i, j)));
		else if (t[i][j])high.pb(mp(x[i][j], mp(i, j)));
	}
	sort(low.begin(), low.end());
	sort(high.begin(), high.end());
	vector<int> count(n, 0), tt(k, 0);
	for (auto c:low){
		while (count[c.se.fi]<k&&tt[count[c.se.fi]]>=n/2)++count[c.se.fi];
		if (count[c.se.fi]<k&&tt[count[c.se.fi]]<n/2)ans[c.se.fi][c.se.se]=count[c.se.fi], got[c.se.fi][count[c.se.fi]]=1, ++tt[count[c.se.fi]];
		++count[c.se.fi];
	}
	count.assign(n, 0);
	for (auto c:high){
		while (count[c.se.fi]<k&&got[c.se.fi][count[c.se.fi]])++count[c.se.fi];
		if (count[c.se.fi]<k&&!got[c.se.fi][count[c.se.fi]])ans[c.se.fi][c.se.se]=count[c.se.fi];
		++count[c.se.fi];
	}
	allocate_tickets(ans);
	return res;
}

• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10