Submission #769127

#	Time	Username	Problem	Language	Result	Execution time	Memory
769127		t6twotwo	Carnival Tickets (IOI20_tickets)	C++17	27 / 100	434 ms	61664 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll find_maximum(int K, vector<vector<int>> x) {
    int N = x.size();
    int M = x[0].size();
    if (M == 1) {
        allocate_tickets(vector(N, vector{0}));
        vector<int> v(N);
        for (int i = 0; i < N; i++) {
            v[i] = x[i][0];
        }
        sort(v.begin(), v.end());
        ll s = 0;
        for (int i = 0; i < N; i++) {
            s += abs(v[N / 2] - v[i]);
        }
        return s;
    }
    if (K == 1) {
        vector dp(N + 1, vector<ll>(N / 2 + 1, -1e18));
        dp[0][0] = 0;
        for (int i = 0; i < N; i++) {
            for (int j = 0; j <= N / 2; j++) {
                if (j < N / 2) {
                    dp[i + 1][j + 1] = dp[i][j] + x[i][M - 1];
                }
                dp[i + 1][j] = max(dp[i + 1][j], dp[i][j] - x[i][0]);
            }
        }
        vector ans(N, vector<int>(M, -1));
        for (int i = N - 1, j = N / 2; i >= 0; i--) {
            if (dp[i][j] - x[i][0] == dp[i + 1][j]) {
                ans[i][0] = 0;
            } else {
                ans[i][M - 1] = 0;
                j--;
            }
        }
        allocate_tickets(ans);
        return dp[N][N / 2];
    }
}

Compilation message (stderr)

tickets.cpp: In function 'll find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:44:1: warning: control reaches end of non-void function [-Wreturn-type]
   44 | }
      | ^

• 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