Submission #942193

# Submission time Handle Problem Language Result Execution time Memory
942193 2024-03-10T10:40:25 Z benjaminkleyn Rarest Insects (IOI22_insects) C++17
99.95 / 100
32 ms 1196 KB
#include <bits/stdc++.h>
#include "insects.h"
using namespace std;

int cnt;
bool inside[2000];
bool bad[2000];

void init()
{
    cnt = 0;
    memset(inside, false, sizeof(inside));
    memset(bad, false, sizeof(bad));
}
void move_in(int i)
{
    if (inside[i])
        return;
    cnt++;
    inside[i] = true;
    move_inside(i);
}
void move_out(int i)
{
    if (!inside[i])
        return;
    cnt--;
    inside[i] = false;
    move_outside(i);
}

int min_cardinality(int N) 
{
    init();
    for (int i = 0; i < N; i++)
    {
        move_in(i);
        if (press_button() > 1)
            move_out(i);
    }
    int num_types = cnt;

    if (num_types == 1)
        return N;
    if (num_types == N)
        return 1;

    mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
    vector<int> p(N);
    iota(p.begin(), p.end(), 0);

    int lo = 1, hi = N / cnt, mid, ans;
    while (lo <= hi)
    {
        mid = (lo + hi) / 2;

        shuffle(p.begin(), p.end(), rng);

        vector<int> new_insects;
        vector<int> bad_insects;
        for (int i = 0; i < N; i++)
        {
            if (!(bad[i] || inside[i]))
            {
                move_in(i);

                if (press_button() > mid)
                {
                    bad_insects.push_back(i);
                    move_out(i);
                }
                else
                    new_insects.push_back(i);

                if (cnt >= mid * num_types)
                    break;
            }
        }

        if (cnt == mid * num_types)
            ans = mid, lo = mid + 1;
        else
        {
            for (int i : bad_insects)
                bad[i] = true;
            for (int i : new_insects)
                move_out(i);
            hi = mid - 1;
        }
    }
    return ans;
}

Compilation message

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:52:36: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   52 |     int lo = 1, hi = N / cnt, mid, ans;
      |                                    ^~~
# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 3 ms 344 KB Output is correct
9 Correct 3 ms 344 KB Output is correct
10 Correct 3 ms 600 KB Output is correct
11 Correct 2 ms 344 KB Output is correct
12 Correct 3 ms 600 KB Output is correct
13 Correct 3 ms 600 KB Output is correct
14 Correct 3 ms 344 KB Output is correct
15 Correct 2 ms 444 KB Output is correct
16 Correct 2 ms 600 KB Output is correct
17 Correct 2 ms 600 KB Output is correct
18 Correct 3 ms 436 KB Output is correct
19 Correct 3 ms 440 KB Output is correct
20 Correct 2 ms 596 KB Output is correct
21 Correct 2 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 3 ms 344 KB Output is correct
9 Correct 3 ms 344 KB Output is correct
10 Correct 3 ms 600 KB Output is correct
11 Correct 2 ms 344 KB Output is correct
12 Correct 3 ms 600 KB Output is correct
13 Correct 3 ms 600 KB Output is correct
14 Correct 3 ms 344 KB Output is correct
15 Correct 2 ms 444 KB Output is correct
16 Correct 2 ms 600 KB Output is correct
17 Correct 2 ms 600 KB Output is correct
18 Correct 3 ms 436 KB Output is correct
19 Correct 3 ms 440 KB Output is correct
20 Correct 2 ms 596 KB Output is correct
21 Correct 2 ms 344 KB Output is correct
22 Correct 1 ms 344 KB Output is correct
23 Correct 4 ms 344 KB Output is correct
24 Correct 5 ms 344 KB Output is correct
25 Correct 11 ms 696 KB Output is correct
26 Correct 11 ms 452 KB Output is correct
27 Correct 11 ms 604 KB Output is correct
28 Correct 6 ms 592 KB Output is correct
29 Correct 12 ms 856 KB Output is correct
30 Correct 12 ms 704 KB Output is correct
31 Correct 10 ms 444 KB Output is correct
32 Correct 9 ms 440 KB Output is correct
33 Correct 11 ms 696 KB Output is correct
34 Correct 10 ms 600 KB Output is correct
35 Correct 11 ms 600 KB Output is correct
36 Correct 13 ms 696 KB Output is correct
37 Correct 11 ms 600 KB Output is correct
38 Correct 12 ms 600 KB Output is correct
39 Correct 10 ms 856 KB Output is correct
40 Correct 7 ms 856 KB Output is correct
41 Correct 4 ms 440 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 8 ms 596 KB Output is correct
8 Correct 10 ms 344 KB Output is correct
9 Correct 24 ms 456 KB Output is correct
10 Correct 27 ms 944 KB Output is correct
11 Correct 20 ms 440 KB Output is correct
12 Correct 12 ms 600 KB Output is correct
13 Correct 27 ms 1196 KB Output is correct
14 Correct 22 ms 424 KB Output is correct
15 Correct 19 ms 680 KB Output is correct
16 Correct 22 ms 600 KB Output is correct
17 Correct 21 ms 444 KB Output is correct
18 Correct 18 ms 592 KB Output is correct
19 Correct 23 ms 592 KB Output is correct
20 Correct 19 ms 592 KB Output is correct
21 Correct 26 ms 860 KB Output is correct
22 Correct 27 ms 456 KB Output is correct
23 Correct 21 ms 680 KB Output is correct
24 Correct 15 ms 1112 KB Output is correct
25 Correct 15 ms 848 KB Output is correct
26 Correct 10 ms 416 KB Output is correct
27 Correct 21 ms 848 KB Output is correct
28 Correct 16 ms 596 KB Output is correct
29 Correct 32 ms 684 KB Output is correct
30 Correct 24 ms 680 KB Output is correct
31 Correct 29 ms 440 KB Output is correct
32 Correct 25 ms 440 KB Output is correct
33 Correct 24 ms 708 KB Output is correct
34 Correct 23 ms 452 KB Output is correct
35 Partially correct 25 ms 692 KB Output is partially correct
36 Correct 19 ms 1112 KB Output is correct
37 Correct 27 ms 680 KB Output is correct
38 Correct 24 ms 688 KB Output is correct
39 Correct 21 ms 848 KB Output is correct
40 Correct 17 ms 672 KB Output is correct
41 Correct 23 ms 676 KB Output is correct
42 Partially correct 30 ms 612 KB Output is partially correct
43 Correct 7 ms 600 KB Output is correct
44 Correct 21 ms 856 KB Output is correct
45 Correct 17 ms 848 KB Output is correct
46 Correct 15 ms 428 KB Output is correct
47 Correct 13 ms 612 KB Output is correct
48 Correct 14 ms 604 KB Output is correct