Submission #603224

#	Time	Username	Problem	Language	Result	Execution time	Memory
603224		Jarif_Rahman	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	514 ms	82000 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define pb push_back
#define f first
#define sc second
using namespace std;
typedef long long int ll;
typedef string str;

ll find_maximum(int k, vector<vector<int>> v){
    int n = v.size(), m = v[0].size();

    vector<ll> mn(n), mx(n);

    for(int i = 0; i < n; i++) mn[i] = v[i][0], mx[i] = v[i][m-1];

    vector<vector<ll>> dp(n, vector<ll>(n/2+1, -1e18));

    dp[n-1][0] = -mn[n-1];
    dp[n-1][1] = mx[n-1];

    for(int i = n-2; i >= 0; i--) for(int j = 0; j <= min(n/2, n-i); j++){
        dp[i][j] = dp[i+1][j]-mn[i];
        if(j != 0) dp[i][j] = max(dp[i][j], dp[i+1][j-1]+mx[i]);
    }

    vector<vector<int>> pos(n, vector<int>(m, -1));

    ll ans = dp[0][n/2];

    cerr << dp[0][2] << " d\n";

    int c = n/2;
    for(int i = 0; i < n; i++){
        if(i == n-1){
            if(c) pos[i][m-1] = 0;
            else pos[i][0] = 0;
            continue;
        }

        if(dp[i][c] == dp[i+1][c]-mn[i])
            pos[i][0] = 0;
        else
            pos[i][m-1] = 0, c--;
    }

    allocate_tickets(pos);

    return ans;
}

• 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