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

insects

#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;
      |                                    ^~~

Subtask #1
10.0 / 10.0

#	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

Subtask #2
15.0 / 15.0

#	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

Subtask #3
74.95 / 75.0

#	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

Submission #942193

Compilation message

Subtask #1 10.0 / 10.0

Subtask #2 15.0 / 15.0

Subtask #3 74.95 / 75.0

Subtask #1
10.0 / 10.0

Subtask #2
15.0 / 15.0

Subtask #3
74.95 / 75.0