Submission #1286289

#	Time	Username	Problem	Language	Result	Execution time	Memory
1286289		lopkus	Rarest Insects (IOI22_insects)	C++20	0 / 100	1 ms	332 KiB

insects

#include <bits/stdc++.h>

#include "insects.h"

std::vector<int> added;

void add(int i) {
  added.push_back(i);
  move_inside(i);
}

void del(int i) {
  for(int j = 0; j < added.size(); j++) {
    if(added[j] == i) {
      added.erase(added.begin() + j);
      break;
    }
  }
  move_outside(i);
}

int get() {
  return press_button();
}

void del_all() {
  for(auto x : added) {
    del(x);
  }
  added.clear();
}

int min_cardinality(int n) {
  int s = std::sqrt(n);
  int cnt = 0;
  std::vector<int> vec;
  for(int i = 0; i < n; i++) {
    add(i);
    if(get() == 1) {
      cnt += 1;
      vec.push_back(i);
    }
    else {
      del(i);
    }
  }
  del_all();
  if(cnt <= s) {
    int ans = n + 1;
    for(auto x : vec) {
      add(x);
      int occ = 1;
      for(int i = 0; i < n; i++) {
        if(i == x) {
          continue;
        }
        add(i);
        if(get() == occ + 1) {
          occ += 1;
        }
        else {
          del(i);
        }
      }
      ans = std::min(ans, occ);
      del_all();
    }
    return ans;
  }
  else {
    std::vector<int> was(n);
    for(int occ = 1; occ <= s; occ++) {
      int all = 0;
      for(int i = 0; i < n; i++) {
        if(was[i]) {
          continue;
        }
        add(i);
        if(get() == occ) {
          all += 1;
          was[i] = 1;
        }
        else {
          del(i);
        }
      }
      if(cnt != all) {
        del_all();
        return occ - 1;
      }
    }
  }
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:93:1: warning: control reaches end of non-void function [-Wreturn-type]
   93 | }
      | ^

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