Submission #1059517

#	Time	Username	Problem	Language	Result	Execution time	Memory
1059517		shiomusubi496	Rarest Insects (IOI22_insects)	C++17	99.89 / 100	42 ms	424 KiB

insects

#include "insects.h"
#include <bits/stdc++.h>

#define rep(i, n) for (int i = 0; i < (int)(n); ++i)
#define rep2(i, a, b) for (int i = (int)(a); i < (int)(b); ++i)
#define rrep(i, n) for (int i = (int)(n) - 1; i >= 0; --i)
#define rrep2(i, a, b) for (int i = (int)(b) - 1; i >= (int)(a); --i)

#define all(v) begin(v), end(v)
#define rall(v) rbegin(v), rend(v)

using namespace std;

using ll = long long;

template<class T, class U> bool chmin(T& a, const U& b) { return a > b ? a = b, true : false; }
template<class T, class U> bool chmax(T& a, const U& b) { return a < b ? a = b, true : false; }

mt19937 mt(random_device{}());

int min_cardinality(int N) {
    int nk = 0;
    vector<bool> f1(N, false), f2(N, false);
    {
        vector<bool> used(N);
        rep (i, N) {
            move_inside(i);
            if (press_button() == 2) move_outside(i);
            else ++nk, used[i] = true;
        }
        f1 = used;
    }
    int ok = 1, ng = N / nk + 1;
    while (ng - ok > 1) {
        int mid = (ok + ng) / 2;
        vector<bool> used(N), used2(N);
        int cnt = 0, lt = -1;
        rep (i, N) {
            if (f1[i]) {
                ++cnt;
                continue;
            }
            if (f2[i]) continue;
            move_inside(i);
            int t = press_button();
            if (t > mid) move_outside(i), used2[i] = true;
            else {
                cnt++, used[i] = true;
            }
            lt = t;
        }
        if (cnt == nk * mid) {
            ok = mid;
            rep (i, N) {
                if (used[i]) f1[i] = true;
            }
        }
        else {
            rep (i, N) {
                if (used2[i]) f2[i] = true;
                if (used[i]) move_outside(i);
            }
            ng = mid;
        }
    }
    return ok;
}

Compilation message (stderr)

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:37:22: warning: variable 'lt' set but not used [-Wunused-but-set-variable]
   37 |         int cnt = 0, lt = -1;
      |                      ^~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.89 / 75