Submission #628806

#	Time	Username	Problem	Language	Result	Execution time	Memory
628806		abeker	Rarest Insects (IOI22_insects)	C++17	87.63 / 100	111 ms	428 KiB

insects

#include <bits/stdc++.h>
#include "insects.h"
using namespace std;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int min_cardinality(int N) {
  vector <int> rest;
  auto attempt = [&](int x, int v) {
    move_inside(x);
    if (press_button() != v) {
      rest.push_back(x);
      move_outside(x);
    }
  };
  for (int i = 0; i < N; i++)
    attempt(i, 1);
  int sol = 1, cnt = N - (int)rest.size();
  for (; !rest.empty(); sol++) {
    vector <int> tmp = rest;
    rest.clear();
    shuffle(tmp.begin(), tmp.end(), rng);
    for (int i = 0; i < tmp.size(); i++)
      if (i < rest.size() + cnt)
        attempt(tmp[i], sol + 1);
      else
        rest.push_back(tmp[i]);
    if (tmp.size() < rest.size() + cnt)
      break;
  }
  return sol;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:23:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (int i = 0; i < tmp.size(); i++)
      |                     ~~^~~~~~~~~~~~
insects.cpp:24:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |       if (i < rest.size() + cnt)
      |           ~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 62.63 / 75