Submission #632182

#	Time	Username	Problem	Language	Result	Execution time	Memory
632182		beaconmc	Rarest Insects (IOI22_insects)	C++17	100 / 100	72 ms	436 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;


#define FOR(i, x, y) for(ll i=x; i<y; i++)
#define FORNEG(i, x, y) for(ll i=x; i>y; i--)

#define fast() ios_base::sync_with_stdio(false);cin.tie(NULL)



int min_cardinality(int N) {
  vector<ll> ins;
  vector<ll> outs;
  FOR(i,0,N){
    move_inside(i);
    ll sus = press_button();
    if (sus>1){
      move_outside(i);
      outs.push_back(i);
    }else{
      ins.push_back(i);
    }
  }
  ll numsize = ins.size();

  ll lo = 1;
  ll hi = N/ins.size()+1;
  while (lo<hi){
    int mid = lo + (hi - lo + 1) / 2;
    vector<ll> nowin;
    vector<ll> nowout;

    while (outs.size()){
      ll sus = outs[outs.size()-1];
      outs.pop_back();
      move_inside(sus);
      ll count = press_button();

      if (count>mid){
        move_outside(sus);
        nowout.push_back(sus);
      }else{
        nowin.push_back(sus);
      }
      if (ins.size() + nowin.size() == mid*numsize){
        break;
      }
    }

    if (ins.size() + nowin.size() == mid*numsize){
      for (auto&i : nowin){
        ins.push_back(i);
      }
      for (auto&i : nowout){
        outs.push_back(i);
      }
      lo = mid;

    }else{
      for (auto&i : nowin){
        move_outside(i);
        outs.push_back(i);
      }

      hi = mid-1;
    }

  }
  return lo;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:49:37: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   49 |       if (ins.size() + nowin.size() == mid*numsize){
      |           ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
insects.cpp:54:35: warning: comparison of integer expressions of different signedness: 'std::vector<long long int>::size_type' {aka 'long unsigned int'} and 'll' {aka 'long long int'} [-Wsign-compare]
   54 |     if (ins.size() + nowin.size() == mid*numsize){
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~

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