Submission #629293

#	Time	Username	Problem	Language	Result	Execution time	Memory
629293		jakubd	Rarest Insects (IOI22_insects)	C++17	0 / 100	1 ms	208 KiB

insects

#include "insects.h"

#include <bits/stdc++.h>

using namespace std;

int min_cardinality(int N) {
  int D = 1;
  vector<int> inside(N), outside(N), leader(N);

  move_inside(0); inside[0] = leader[0] = 1;
  for (int i = 1; i < N; i++) {
    move_inside(i);
    if (press_button() == 2) {
      move_outside(i);
      outside[i] = 1;
    } else {
      D++;
      inside[i] = leader[i] = 1;
    }
  }

  int l = 2, r = N / D, cur = D, ans = 1;
  while (l <= r) {
    int m = (l + r) / 2;

    vector<int> last;
    for (int i = 0; i < N; i++) {
      if (inside[i]) continue;
      move_inside(i);
      if (press_button() > m) {
        move_outside(i);
      } else {
        last.push_back(i);
        inside[i] = 1;
        outside[i] = 0;
        cur++;
      }
    }

    if (cur >= D * m) {
      l = m + 1;
      ans = m;
    } else {
      r = m - 1;
      for (auto x : last) {
        move_outside(x);
        inside[x] = 0;
        outside[x] = 1;
        cur--;
      }
    }
  }

  return l;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:23:34: warning: variable 'ans' set but not used [-Wunused-but-set-variable]
   23 |   int l = 2, r = N / D, cur = D, ans = 1;
      |                                  ^~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 15
• Subtask 3: 0 / 75