Submission #307158

#	Time	Username	Problem	Language	Result	Execution time	Memory
307158		Ruxandra985	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	739 ms	72616 KiB

tickets

#include <bits/stdc++.h>
#include "tickets.h"
#define DIMN 1510
#define MLD 1000000000

using namespace std;


long long dp[DIMN][DIMN];
int tt[DIMN][DIMN] , prefix[DIMN] , sufix[DIMN];
int f[DIMN];

long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size() , i , j;
	int m = x[0].size();
	long long sol = 0;
	vector<vector<int>> answer;
	for (i = 0; i < n; i++) {
		vector<int> row;
		row.resize(m , -1);
		answer.push_back(row);
		sufix[i] = m - 1;
	}

    for (int r = 0 ; r < k ; r++){

        /// dp[i][j] = smin daca esti la linia i si ai selectat j din stanga

        tt[0][0] = 1;

        for (i = 1 ; i <= n ; i++){
            for (j = 0 ; j <= n / 2 && j <= i ; j++){

                if (j != 0){

                    if (!tt[i - 1][j] && tt[i - 1][j - 1]){
                        dp[i][j] = dp[i - 1][j - 1] + x[i - 1][prefix[i - 1]];
                        tt[i][j] = -1;
                    }
                    else if (!tt[i - 1][j - 1] && tt[i - 1][j]){
                        dp[i][j] = dp[i - 1][j] + MLD - x[i - 1][sufix[i - 1]];
                        tt[i][j] = 1;
                    }
                    else if (tt[i - 1][j - 1] && tt[i - 1][j]){

                        if (dp[i - 1][j] + MLD - x[i - 1][sufix[i - 1]] <= dp[i - 1][j - 1] + x[i - 1][prefix[i - 1]]){
                            dp[i][j] = dp[i - 1][j] + MLD - x[i - 1][sufix[i - 1]];
                            tt[i][j] = 1;
                        }
                        else {
                            dp[i][j] = dp[i - 1][j - 1] + x[i - 1][prefix[i - 1]];
                            tt[i][j] = -1;
                        }

                    }

                }
                else if (tt[i - 1][j]){
                    dp[i][j] = dp[i - 1][j] + MLD - x[i - 1][sufix[i - 1]];
                    tt[i][j] = 1;
                }

            }
        }

        sol = 1LL * MLD * n / 2 - dp[n][n / 2];

        i = n;
        j = n / 2;

        while (i){

            if (tt[i][j] == -1){
                answer[i - 1][prefix[i - 1]] = r;
                prefix[i - 1]++;
                j--;
            }
            else {
                answer[i - 1][sufix[i - 1]] = r;
                sufix[i - 1]--;
            }

            i--;

        }

	}


	allocate_tickets(answer);
	return sol;
}

• 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