Submission #627802

#	Time	Username	Problem	Language	Result	Execution time	Memory
627802		tutis	Rarest Insects (IOI22_insects)	C++17	10 / 100	277 ms	1208 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
pair<int, int> min_cardinality(vector<int> x)
{
    if (x.size() == 1)
        return {1, 1};
    if (x.empty())
        return {0, 0};
    vector<int>v;
    for (int i : x)
    {
        v.push_back(i);
        move_inside(i);
        int k = press_button();
        if (k == 2)
        {
            v.pop_back();
            move_outside(i);
        }
    }
    int cnt = v.size();
    if (cnt * 2 > x.size())
        return {1, cnt};
    set<int> X(v.begin(), v.end());
    for (int i : v)
        move_outside(i);
    v.clear();
    reverse(x.begin(), x.end());
    for (int i : x)
    {
        v.push_back(i);
        move_inside(i);
        int k = press_button();
        if (k == 2)
        {
            v.pop_back();
            move_outside(i);
        }
    }
    for (int i : v)
        move_outside(i);
    set<int> Y(v.begin(), v.end());
    for (int i : X)
    {
        if (Y.find(i) != Y.end())
            return {1, cnt};
    }
    set<int>S(x.begin(), x.end());
    for (int i : X)
        S.erase(i);
    for (int i : Y)
        S.erase(i);
    pair<int, int>ans = min_cardinality(vector<int>(S.begin(), S.end()));
    if (ans.second != (int)v.size())
        return {2, (int)v.size()};
    ans.first += 2;
    return ans;
}
int min_cardinality(int N) {
    vector<int>v;
    for (int i = 0; i < N; i++)
        v.push_back(i);
    return min_cardinality(v).first;
}

Compilation message (stderr)

insects.cpp: In function 'std::pair<int, int> min_cardinality(std::vector<int>)':
insects.cpp:23:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     if (cnt * 2 > x.size())
      |         ~~~~~~~~^~~~~~~~~~

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