Submission #859352

#	Time	Username	Problem	Language	Result	Execution time	Memory
859352		thinknoexit	Rarest Insects (IOI22_insects)	C++17	0 / 100	0 ms	344 KiB

insects

#include <bits/stdc++.h>
#include "insects.h"
using namespace std;
using ll = long long;
int in[2020];
int min_cardinality(int n) {
    int type = 0;
    for (int i = 0;i < n;i++) {
        move_inside(i);
        if (press_button() == 2) {
            move_outside(i);
        }
        else in[i] = 1, type++;
    }
    for (int i = 0;i < n;i++) if (in[i]) move_outside(i);
    if (type == 1) return n;
    if (type > n / 2) return 1;
    int mxans = n / type;
    int l = 1, r = mxans;
    int sz = type;
    while (l < r) {
        int mid = (l + r + 1) / 2;
        stack<int> s;
        for (int i = 0;i < n;i++) {
            if (in[i]) continue;
            move_inside(i);
            if (press_button() > mid) move_outside(i);
            else in[i] = 1, s.push(i), sz++;
            if (sz == type * mid) break;
        }
        if (sz < type * mid) {
            int S = (l + mid) / 2;
            while (!s.empty()) {
                move_outside(s.top());
                in[s.top()] = 0;
                s.pop();
                sz--;
                if (press_button() <= type * S) break;
            }
            r = mid - 1;
        }
        else l = mid;
    }
    return l;
}

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