Submission #609539

#	Time	Username	Problem	Language	Result	Execution time	Memory
609539		penguinhacker	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	848 ms	83860 KiB

tickets

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

#define ll long long
#define ar array

long long find_maximum(int k, vector<vector<int>> x) {
	int n=x.size();
	int m=x[0].size();
	ll winnings=0;
	vector<ar<int, 2>> gain;
	for (int i=0; i<n; i++)
		for (int j=0; j<k; ++j) {
			gain.push_back({x[i][j]+x[i][m-k+j], i});
			winnings-=x[i][j];
		}
	sort(gain.rbegin(), gain.rend());
	vector<int> cnt(n);
	for (int i=0; i<n*k/2; ++i) {
		winnings+=gain[i][0];
		++cnt[gain[i][1]];
	}
	vector<vector<int>> ans(n, vector<int>(m, -1));
	for (int r=0; r<k; ++r) {
		vector<ar<int, 2>> v(n);
		for (int i=0; i<n; ++i)
			v[i]={cnt[i], i};
		sort(v.begin(), v.end());
		for (int i=0; i<n/2; ++i) {
			int ind=v[i][1];
			int lft=k-r-cnt[ind];
			assert(lft>0);
			ans[ind][lft-1]=r;
		}
		for (int i=n/2; i<n; ++i) {
			int ind=v[i][1];
			int lft=cnt[ind];
			assert(lft>0);
			ans[ind][m-lft]=r;
			--cnt[ind];
		}
	}
	allocate_tickets(ans);
	return winnings;
}

• 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