Submission #300591

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
300591	2020-09-17 10:02:00	ecnerwala	Carnival Tickets (IOI20_tickets)	C++17	100 / 100	962 ms	62312 KiB

tickets

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#include "tickets.h"
#include <bits/stdc++.h>
long long find_maximum(int K, std::vector<std::vector<int>> X) {
  int N = int(X.size());
  int M = int(X[0].size());
  std::vector<std::vector<int>> answer(N, std::vector<int>(M, -1));
  struct cnd_t {
    int val;
    int i;
  };
  std::vector<cnd_t> cnds; cnds.reserve(N*K);
  int64_t tot_val = 0;
  {
    std::vector<std::pair<int, int>> vals(M);
    for (int i = 0; i < N; i++) {
      for (int j = 0; j < K; j++) {
        tot_val -= X[i][j];
        cnds.push_back({X[i][j] + X[i][j+(M-K)], i});
      }
    }
  }
  auto md = cnds.begin() + N/2*K;
  std::nth_element(cnds.begin(), md, cnds.end(),
      [&](const auto& a, const auto& b) { return a.val > b.val; });
  cnds.erase(md, cnds.end());
 
 
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• Subtask 1: 11 / 11
• Subtask 2: 16 / 16
• Subtask 3: 14 / 14
• Subtask 4: 14 / 14
• Subtask 5: 12 / 12
• Subtask 6: 23 / 23
• Subtask 7: 10 / 10