Submission #954048

#	Time	Username	Problem	Language	Result	Execution time	Memory
954048		ALTAKEXE	Rarest Insects (IOI22_insects)	C++17	Compilation error	0 ms	0 KiB

insects

#include "insects.h"
#include<bits/stdc++.h>
#define ll long long
using namespace std;
const int NN = 1e5 + 10;
bool in[NN];
mt19937 rng(10184104810471);
ll rnd(ll l, ll r) {
  return l + rng() % (r - l + 1);
}
 
ll min_cardinality(ll n) {
  ll type = 0;
  vector<ll> candidate;
  for(ll i = 0; i < n; i++) {
    move_inside(i);
    if (press_button() == 1) {
      ++type;
      in[i] = 1;
    }
    else {
      move_outside(i);
      candidate.push_back(i);
    }
  }
 
  ll l = 2, r = n / type, ans = 1;
  ll cur = 1;
 
  while (l <= r) {
    shuffle(candidate.begin(), candidate.end(), rng);
    ll mid = (l + r + 1) / 2;
    assert(cur <= mid);
    ll last = cur;
    for(auto &i : candidate) {
      move_inside(i);
      ll nxt = press_button();
      if (nxt > mid) {
        move_outside(i);
        in[i] = 0;
      }
      else {
        cur = nxt;
        in[i] = 1;
      }
    }
    ll total = 0;
    for(ll i = 0; i < n; i++) total += in[i];
    vector<ll> _candidate;
 
    if (cur == mid && mid * type == total) {
      for(auto &i : candidate) if (!in[i]) _candidate.push_back(i);
      l = mid + 1;
      ans = mid;
    }
    else {
      for(auto &i : candidate) if (in[i]) {
        _candidate.push_back(i);
        move_outside(i);
        in[i] = 0;
      }
      r = mid - 1;
      cur = last;
    }
    candidate = _candidate;
  }
  return ans;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccahYMHt.o: in function `main':
stub.cpp:(.text.startup+0x61): undefined reference to `min_cardinality(int)'
collect2: error: ld returned 1 exit status