Submission #1281151

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281151		Faggi	Rarest Insects (IOI22_insects)	C++20	70 / 100	34 ms	452 KiB

insects

#include <bits/stdc++.h>
#define ll long long
#define sz(x) int(x.size())
#define forn(i,n) for(i=0; i<n; i++)
#define all(x) x.begin(),x.end()
#define pb push_back
#define mp make_pair
#define fr first
#define se second
using namespace std;

void move_inside(int i);
void move_outside(int i);
int press_button();

int min_cardinality(int N)
{
    ll i, cant=0;
    vector<ll>v(N,0);
    for(i=N-1; i>=0; i--)
    {
        move_inside(i);
        if(press_button()==1)
        {
            cant++;
            v[i]=1;
        }
        else
            move_outside(i);
    }
    for(i=0; i<N; i++)
        if(v[i])
            move_outside(i);

    ll ma=N/cant, fin;
    while(true)
    {
        vector<ll>in;
        fin=0;
        for(i=0; i<N; i++)
        {
            move_inside(i);
            if(press_button()>=ma)
            {
                if(v[i])
                    fin++;
                move_outside(i);
            }
            else
                in.pb(i);
        }

        if(fin==cant)
            return int(ma);
        ll M=sz(in)-fin*(ma-1);
        ma=M/(cant-fin);

        for(i=0; i<sz(in); i++)
            move_outside(in[i]);

    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 45 / 75