Submission #633917

#	Time	Username	Problem	Language	Result	Execution time	Memory
633917		Kirill22	Rarest Insects (IOI22_insects)	C++17	100 / 100	66 ms	440 KiB

insects

#include<bits/stdc++.h>
 
using namespace std;
 
void move_inside(int i);
void move_outside(int i);
int press_button();
 
int min_cardinality(int n) {
    mt19937 gen(22);
    vector<int> ord(n);
    iota(ord.begin(), ord.end(), 0);
    shuffle(ord.begin(), ord.end(), gen);
    vector<int> used(n);
    for (auto i : ord) {
        move_inside(i);
        if (press_button() >= 2) {
            move_outside(i);
        } else {
            used[i] = 1;
        }
    }
    int cnt = accumulate(used.begin(), used.end(), 0);
    if (cnt == 1) {
        return n;
    }
    int l = 1, r = n / cnt + 1;
    auto start = used;
    vector<int> ban(n);
    while (l + 1 < r) {
        int m = (l + r) / 2;
        for (auto i : ord) {
            if (used[i] && !start[i]) {
                used[i] = 0;
                move_outside(i);
            }
        }
        vector<int> b;
      	int cnt2 = accumulate(used.begin(), used.end(), 0);
        for (auto i : ord) {
            if (!used[i] && !ban[i]) {
                move_inside(i);
                int res = press_button();
                if (res >= m + 1) {
                    move_outside(i);
                    b.push_back(i);
                } else {
                    used[i] = 1;
                  	cnt2++;
                  	if (cnt2 == m * cnt) {
                      	break;
                    }
                }
            }
        }
        //cout << m << " " << cnt2 << endl;
        //for (auto x : used) cout << x << " "; cout << endl;
        //for (auto x : ban) cout << x << " "; cout << endl;
        if (m * cnt == cnt2) {
            l = m;
            start = used;
        } else {
            r = m;
            for (auto i : b) {
                ban[i] = 1;
            }
        }
    }
    return l;
}

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