Submission #307172

#	Time	Username	Problem	Language	Result	Execution time	Memory
307172		Ruxandra985	Carnival Tickets (IOI20_tickets)	C++14	27 / 100	756 ms	104696 KiB

tickets

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

using namespace std;


long long spl[DIMN][DIMN] , spr[DIMN][DIMN];
int prefix[DIMN] , sufix[DIMN];
int f[DIMN];

vector <long long> dp[DIMN] , tt[DIMN];

long long find_maximum(int k, vector<vector<int>> x) {
	int n = x.size() , i , j , take , l , r;
	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 (i = 1 ; i <= n ; i++){

        for (j = 1 ; j <= m ; j++)
            spl[i][j] = x[i - 1][j - 1] + spl[i][j - 1];

        for (j = m ; j ; j--)
            spr[i][j] = MLD - x[i - 1][j - 1] + spr[i][j + 1];

	}

	for (i = 0 ; i <= n ; i++){
        dp[i].resize(k * n / 2 + 1);
        tt[i].resize(k * n / 2 + 1);
	}

	tt[0][0] = 1;

	for (i = 1 ; i <= n ; i++){

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

            dp[i][j] = 1000000000000000000LL;

            /// cate intre 0 si k iau de aici

            for (take = 0 ; take <= j && take <= k ; take++){

                if (tt[i - 1][j - take]){


                    if (dp[i][j] > dp[i - 1][j - take] + spl[i][take] + spr[i][m - (k - take) + 1]){

                        dp[i][j] = dp[i - 1][j - take] + spl[i][take] + spr[i][m - (k - take) + 1];
                        tt[i][j] = take + 1;

                    }

                }

            }



        }


	}

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

	i = n;
	j = k * n / 2;

	while (i){

        l = tt[i][j] - 1;

        for (r = 0 ; r < l ; r++){
            answer[i - 1][r] = r;
        }

        for (r = 0 ; r < k - l ; r++){
            answer[i - 1][m - 1 - r] = l + r;
        }


        j -= l;
        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