Submission #893132

#	Time	Username	Problem	Language	Result	Execution time	Memory
893132		Trisanu_Das	Rarest Insects (IOI22_insects)	C++17	90.13 / 100	48 ms	1116 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 ans = 1, cnt = N - (int)rest.size();
  for (; !rest.empty(); ans++) {
    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], ans + 1);
      else rest.push_back(tmp[i]);
    if (tmp.size() < rest.size() + cnt) break;
  }
  return ans;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i = 0; i < tmp.size(); i++)
      |                     ~~^~~~~~~~~~~~
insects.cpp:20:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |       if (i < rest.size() + cnt) attempt(tmp[i], ans + 1);
      |           ~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 65.13 / 75