Submission #304555

#	Time	Username	Problem	Language	Result	Execution time	Memory
304555		Leonardo_Paes	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	763 ms	77272 KiB

tickets

#include "tickets.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
const int maxn = 1510;
int N, M, mat[2][maxn], nxt[maxn][maxn]; // min e max, 0 e 1
long long dp[maxn][maxn];
long long solve(int row, int qtd){
    if(row == N) return 0;
    if(dp[row][qtd] != -1) return dp[row][qtd];
    if(qtd == 0) dp[row][qtd] = -mat[0][row] + solve(row+1, qtd), nxt[row][qtd] = qtd;
    else if(N-row == qtd) dp[row][qtd] = mat[1][row] + solve(row+1, qtd-1), nxt[row][qtd] = qtd-1;
    else{
        long long caso1 = mat[1][row] + solve(row+1, qtd-1);
        long long caso2 = -mat[0][row] + solve(row+1, qtd);
        if(caso1 > caso2){
            dp[row][qtd] = caso1;
            nxt[row][qtd] = qtd-1;
        }
        else{
            dp[row][qtd] = caso2;
            nxt[row][qtd] = qtd;
        }
    }
    return dp[row][qtd];
}
long long find_maximum(int k, vector<vector<int>> x) {
	N = x.size(), M = x[0].size();
	vector<vector<int>> answer;
	for(int i=0; i<N; i++){
		vector<int> row(M);
		for(int j=0; j<M; j++) row[j] = -1;
		answer.push_back(row);
		mat[0][i] = x[i][0];
		mat[1][i] = x[i][M-1];
	}
	memset(dp, -1, sizeof dp);
	long long ans = solve(0, N/2);
	int qtd = N/2;
	for(int r=0; r<N; r++){
        if(nxt[r][qtd] == qtd) answer[r][0] = 0;
        else{
            answer[r][M-1] = 0;
            qtd--;
        }
	}
	allocate_tickets(answer);
	return ans;
	/*
4 2 1
5 9
1 4
3 6
2 7
	*/
}

• 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