Submission #622779

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
622779	2022-08-04T14:23:52 Z	erekle	Counting Mushrooms (IOI20_mushrooms)	C++17	87.5969 / 100	11 ms	392 KB

mushrooms

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

using namespace std;

int count_mushrooms(int n) {
	int s = 141; // sqrt(20000)
	vector<int> v(n);
	for (int i = 0; i < n; ++i) v[i] = i;
	srand(time(NULL));
	random_shuffle(v.begin()+1, v.end());
	
	// find first 2s values pairwise
	vector<int> id[2]; // A, B
	id[0].push_back(0);
	vector<int> m;
	int last = min(2*s, n);
	for (int i = 1; i < last; ) {
		if (i+1 < last && (id[0].size() >= 2 || id[1].size() >= 2)) {
			int same = 0;
			if (id[0].size() < 2) same = 1;

			m = {v[id[same][0]], v[i], v[id[same][1]], v[i+1]};
			int x = use_machine(m);
			if (x & 1) id[1-same].push_back(i+1);
			else id[same].push_back(i+1);
			if (x & 2) id[1-same].push_back(i);
			else id[same].push_back(i);
			i += 2;
		} else {
			m = {v[0], v[i]};
			if (use_machine(m)) id[1].push_back(i);
			else id[0].push_back(i);
			i++;
		}
	}

	// find the rest of the values as blocks of s
	int A = id[0].size();
	for (int i = last; i < n; ) {
		int big = (id[1].size() > id[0].size() ? 1 : 0);
		int cnt = min((int)id[big].size(), n-i);
		m.clear();
		for (int j = 0; j < cnt; ++j) {
			m.push_back(v[i+j]);
			m.push_back(v[id[big][j]]);
		}
		int x = use_machine(m);
		if (x & 1) {
			id[1-big].push_back(i);
			++x;
		} else id[big].push_back(i);
		x /= 2;
		if (big == 0) x = cnt-x;
		A += x;
		i += cnt;
	}
	return A;
}

Subtask #1

87.5969 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	208 KB	Output is correct
2	Correct	0 ms	208 KB	Output is correct
3	Correct	0 ms	208 KB	Output is correct
4	Correct	1 ms	208 KB	Output is correct
5	Correct	2 ms	208 KB	Output is correct
6	Correct	3 ms	208 KB	Output is correct
7	Correct	6 ms	336 KB	Output is correct
8	Correct	6 ms	336 KB	Output is correct
9	Correct	6 ms	336 KB	Output is correct
10	Partially correct	6 ms	336 KB	Output is partially correct
11	Partially correct	7 ms	392 KB	Output is partially correct
12	Partially correct	7 ms	336 KB	Output is partially correct
13	Correct	7 ms	336 KB	Output is correct
14	Correct	3 ms	336 KB	Output is correct
15	Partially correct	9 ms	336 KB	Output is partially correct
16	Partially correct	7 ms	336 KB	Output is partially correct
17	Correct	4 ms	336 KB	Output is correct
18	Correct	11 ms	388 KB	Output is correct
19	Partially correct	10 ms	388 KB	Output is partially correct
20	Partially correct	9 ms	336 KB	Output is partially correct
21	Partially correct	6 ms	336 KB	Output is partially correct
22	Partially correct	7 ms	336 KB	Output is partially correct
23	Correct	6 ms	376 KB	Output is correct
24	Correct	4 ms	336 KB	Output is correct
25	Partially correct	6 ms	336 KB	Output is partially correct
26	Partially correct	7 ms	336 KB	Output is partially correct
27	Partially correct	6 ms	336 KB	Output is partially correct
28	Partially correct	9 ms	336 KB	Output is partially correct
29	Partially correct	7 ms	388 KB	Output is partially correct
30	Partially correct	6 ms	336 KB	Output is partially correct
31	Partially correct	7 ms	388 KB	Output is partially correct
32	Partially correct	8 ms	336 KB	Output is partially correct
33	Partially correct	6 ms	384 KB	Output is partially correct
34	Partially correct	7 ms	336 KB	Output is partially correct
35	Partially correct	6 ms	336 KB	Output is partially correct
36	Partially correct	7 ms	336 KB	Output is partially correct
37	Partially correct	7 ms	336 KB	Output is partially correct
38	Partially correct	7 ms	336 KB	Output is partially correct
39	Partially correct	6 ms	336 KB	Output is partially correct
40	Partially correct	8 ms	336 KB	Output is partially correct
41	Partially correct	6 ms	384 KB	Output is partially correct
42	Partially correct	9 ms	388 KB	Output is partially correct
43	Partially correct	7 ms	336 KB	Output is partially correct
44	Partially correct	7 ms	336 KB	Output is partially correct
45	Partially correct	7 ms	336 KB	Output is partially correct
46	Partially correct	6 ms	336 KB	Output is partially correct
47	Partially correct	8 ms	336 KB	Output is partially correct
48	Partially correct	9 ms	336 KB	Output is partially correct
49	Partially correct	8 ms	336 KB	Output is partially correct
50	Partially correct	9 ms	336 KB	Output is partially correct
51	Partially correct	9 ms	336 KB	Output is partially correct
52	Partially correct	7 ms	336 KB	Output is partially correct
53	Partially correct	5 ms	388 KB	Output is partially correct
54	Partially correct	7 ms	388 KB	Output is partially correct
55	Partially correct	7 ms	336 KB	Output is partially correct
56	Partially correct	8 ms	384 KB	Output is partially correct
57	Partially correct	6 ms	336 KB	Output is partially correct
58	Partially correct	7 ms	392 KB	Output is partially correct
59	Partially correct	6 ms	336 KB	Output is partially correct
60	Partially correct	7 ms	336 KB	Output is partially correct
61	Partially correct	8 ms	388 KB	Output is partially correct
62	Correct	0 ms	208 KB	Output is correct
63	Correct	0 ms	208 KB	Output is correct
64	Correct	0 ms	208 KB	Output is correct
65	Correct	1 ms	208 KB	Output is correct
66	Correct	1 ms	260 KB	Output is correct
67	Correct	0 ms	208 KB	Output is correct
68	Correct	0 ms	208 KB	Output is correct
69	Correct	0 ms	208 KB	Output is correct
70	Correct	1 ms	208 KB	Output is correct
71	Correct	0 ms	208 KB	Output is correct
72	Correct	0 ms	208 KB	Output is correct
73	Correct	0 ms	208 KB	Output is correct
74	Correct	0 ms	208 KB	Output is correct
75	Correct	1 ms	208 KB	Output is correct
76	Correct	0 ms	208 KB	Output is correct
77	Correct	0 ms	208 KB	Output is correct
78	Correct	1 ms	208 KB	Output is correct
79	Correct	1 ms	208 KB	Output is correct
80	Correct	0 ms	208 KB	Output is correct
81	Correct	1 ms	208 KB	Output is correct
82	Correct	0 ms	208 KB	Output is correct
83	Correct	0 ms	208 KB	Output is correct
84	Correct	0 ms	208 KB	Output is correct
85	Correct	1 ms	208 KB	Output is correct
86	Correct	1 ms	208 KB	Output is correct
87	Correct	1 ms	208 KB	Output is correct
88	Correct	1 ms	208 KB	Output is correct
89	Correct	1 ms	208 KB	Output is correct
90	Correct	1 ms	208 KB	Output is correct
91	Correct	1 ms	208 KB	Output is correct