Submission #1106519

#	Time	Username	Problem	Language	Result	Execution time	Memory
1106519		snpmrnhlol	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	573 ms	94680 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N = 15e2;
vector<pair<int,int>> nr;
vector <int> bad;
int r[N];
int l[N];
bool vis[N];
long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	std::vector<std::vector<int>> answer;
    answer.resize(n);
    ll score = 0;
	for(int i = 0;i < n;i++){
        answer[i].resize(m);
        for(int j = 0;j < k;j++){
            nr.push_back({- x[i][j] - x[i][m - k + j], i});
            score-=x[i][j];
        }
        for(int j = 0;j < m;j++){
            answer[i][j] = -1;
        }
        l[i] = k;
	}
    sort(nr.begin(),nr.end());
    for(int i = 0;i < n*k/2;i++){
        score+=x[nr[i].second][k - 1 - r[nr[i].second]];
        score+=x[nr[i].second][m - 1 - r[nr[i].second]];
        r[nr[i].second]++;
        l[nr[i].second]--;
    }
    for(int i = 0;i < k;i++){
        int cnt1 = 0,cnt2 = 0;
        for(int j = 0;j < n;j++){
            vis[j] = 1;
            if(r[j] == 0){
                ///take left
                answer[j][l[j] - 1] = i;
                cnt2++;
                l[j]--;
            }else if(l[j] == 0){
                ///take right
                answer[j][m - r[j]] = i;
                cnt1++;
                r[j]--;
            }else vis[j] = 0;
        }
        for(int j = 0;j < n;j++){
            if(!vis[j]){
                vis[j] = 1;
                if(cnt1 != n/2){
                    ///take right
                    answer[j][m - r[j]] = i;
                    cnt1++;
                    r[j]--;
                }else{
                    ///take left
                    answer[j][l[j] - 1] = i;
                    cnt2++;
                    l[j]--;
                }
            }
        }
    }
	allocate_tickets(answer);
	return score;
}
/**
1, [[5, 9], [1, 4], [3, 6], [2, 7]]

4 2 1
5 9
1 4
3 6
2 7
**/

• 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