Submission #638922

#	Time	Username	Problem	Language	Result	Execution time	Memory
638922		slime	Carnival Tickets (IOI20_tickets)	C++14	0 / 100	1 ms	300 KiB

tickets

#include "tickets.h"
#include "bits/stdc++.h"
using namespace std;
long long find_maximum(int k, std::vector<std::vector<int>> x) {
	int n = x.size();
	int m = x[0].size();
	std::vector<std::vector<int>> answer;
	for (int i = 0; i < n; i++) {
		std::vector<int> row(m);
		for (int j = 0; j < m; j++) {
			row[j] = -1;
		}
		answer.push_back(row);
	}

  vector<int> tries;

  for(int i=0; i<n; i++) {
    tries.push_back(x[i][0]);
    tries.push_back(x[i][m - 1]);
  }
  sort(tries.begin(), tries.end());

  long long ans = -1;
  for(long long tt : tries) {

    priority_queue<pair<long long, int> > pq;

    for(int i=0; i<n; i++) {
      pq.push({abs(tt - x[i][0]), i});
      pq.push({abs(tt - x[i][m - 1]), n + i});
    }

    long long smol = 0, big = 0;
    int chosen[n];
    for(int i=0; i<n; i++) chosen[i] = 0;


    long long ss = 0;
    while(pq.size()) {
      int ff = pq.top().second % n;
      int cc = pq.top().second / n;
      long long vv = pq.top().first;
      pq.pop();
      if(chosen[ff]) continue;
      long long rr = (cc == 1 ? x[ff][m - 1] : x[ff][0]);
      if(rr >= tt && big == n/2) continue;
      if(rr < tt && smol == n/2) continue;
      chosen[ff] = (cc == 0 ? 1 : 2);
      if(cc == 1) big++;
      else smol++;
      ss += vv;
    }
    if(ss > ans && big == smol && big == n/2) {
      ans = ss;
      for(int i=0; i<n; i++) {
        for(int j=0; j<m; j++) {
          answer[i][j] = -1;
        }
      }

      for(int i=0; i<n; i++) {
        if(chosen[i] == 1) answer[i][0] = 0;
        else answer[i][m - 1] = 0;
      }
    }
  }

	allocate_tickets(answer);
  return ans;
  
}

• Subtask 1: 0 / 11
• Subtask 2: 0 / 16
• Subtask 3: 0 / 14
• Subtask 4: 0 / 14
• Subtask 5: 0 / 12
• Subtask 6: 0 / 23
• Subtask 7: 0 / 10