Submission #627874

#	Time	Username	Problem	Language	Result	Execution time	Memory
627874		tutis	Rarest Insects (IOI22_insects)	C++17	82.04 / 100	120 ms	336 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
int min_cardinality(vector<int> x)
{
    int N = x.size();
    int add2 = 0;
    int add1 = 0;
    vector<int>y;
    int lo, hi;
    auto cnt = [&](int c)->int
    {
        vector<int>v;
        y = {};
        int k = 0;
        for (int i : x)
        {
            v.push_back(i);
            move_inside(i);
            k = press_button();
            if (k + add1 == c + 1)
            {
                v.pop_back();
                move_outside(i);
                y.push_back(i);
            }
        }
        int r = v.size();
        for (int i : v)
            move_outside(i);
        return add2 + r;
    };
    int c = cnt(1);
    if (c * 2 > N)
        return 1;
    {
        x = y;
        add2 = c;
        add1 = 1;
    }
    lo = 1;
    hi = N / c;
    double bias = 3.2;
    while (lo < hi)
    {
        int m = round((lo * bias + hi * 1.0) / (bias + 1));
        if (hi - lo + 1 <= 8)
            m = (lo + hi + 1) / 2;
        m = max(m, lo + 1);
        m = min(m, hi);
        int k = cnt(m);
        if (k == m * c)
        {
            lo = m;
            x = y;
            add2 = m * c;
            add1 = m;
        }
        else
            hi = m - 1;
    }
    return lo;
}
int min_cardinality(int N) {
    vector<int>v;
    for (int i = 0; i < N; i++)
        v.push_back(i);
    return min_cardinality(v);
}

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 57.04 / 75