Submission #822933

#	Time	Username	Problem	Language	Result	Execution time	Memory
822933		finn__	Rarest Insects (IOI22_insects)	C++17	47.77 / 100	194 ms	528 KiB

insects

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

std::bitset<2000> in_machine;

int min_cardinality(int N)
{
    move_inside(0);
    in_machine[0] = 1;
    int d = 1;
    for (int i = 1; i < N; ++i)
    {
        move_inside(i);
        if (press_button() > 1)
            move_outside(i);
        else
            ++d, in_machine[i] = 1;
    }

    for (int i = 0; i < N; ++i)
        if (in_machine[i])
            move_outside(i), in_machine[i] = 0;

    int a = 1, b = N;
    while (a < b)
    {
        int const mid = (a + b + 1) >> 1;
        std::vector<int> moved;

        for (int i = 0; i < N && in_machine.count() < d * mid; ++i)
            if (!in_machine[i])
            {
                move_inside(i);
                if (press_button() > mid)
                    move_outside(i);
                else
                    in_machine[i] = 1, moved.push_back(i);
            }

        if (in_machine.count() == d * mid)
        {
            a = mid;
        }
        else
        {
            b = mid - 1;
            for (auto const &i : moved)
                in_machine[i] = 0, move_outside(i);
        }
    }

    return a;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:30:53: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |         for (int i = 0; i < N && in_machine.count() < d * mid; ++i)
      |                                  ~~~~~~~~~~~~~~~~~~~^~~~~~~~~
insects.cpp:40:32: warning: comparison of integer expressions of different signedness: 'std::size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   40 |         if (in_machine.count() == d * mid)
      |             ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 22.77 / 75