Submission #1230921

#	Time	Username	Problem	Language	Result	Execution time	Memory
1230921		PlayVoltz	Carnival Tickets (IOI20_tickets)	C++20	100 / 100	731 ms	194604 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)));
	}
	vector<set<int> > s(n);
	for (int i=0; i<n; ++i)for (int j=0; j<k; ++j)s[i].insert(j);
	for (int i=0; i<low.size(); ++i)ans[low[i].se.fi][low[i].se.se]=i%k, s[low[i].se.fi].erase(i%k);
	for (int i=0, c=0; i<high.size(); ++i){
		ans[high[i].se.fi][high[i].se.se]=*s[high[i].se.fi].begin();
		s[high[i].se.fi].erase(s[high[i].se.fi].begin());
	}
	allocate_tickets(ans);
	return res;
}

• 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