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Submission #876343

# Submission time Handle Problem Language Result Execution time Memory
876343 2023-11-21T15:07:09 Z Kanon Counting Mushrooms (IOI20_mushrooms) C++14
91.8699 / 100
 5 ms 880 KB 
#include <bits/stdc++.h>
#include "mushrooms.h"

using namespace std;

const int magic = 100;
const int bound = 226;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
// generate random number between l, r : uniform_int_distribution<long long>(l, r)(rng)
// random shuffle : shuffle(.begin(), .end(), rng)

int count_mushrooms(int n) {

  if (n <= bound + 1) {
    int ret = 1;
    for (int i = 1; i < n; i++) {
      ret += use_machine({0, i}) ^ 1;
    }
    return ret;
  }

  vector<int> a(n, -1);
  a[0] = 0;

  vector<int> order(magic);
  iota(order.begin(), order.end(), 1);
  shuffle(order.begin(), order.end(), rng);
  int cnt = magic + 1;

  vector<int> ONE, ZERO;
  ZERO.push_back(0);
  for (int i = 0; i < 2; i++) {
    a[cnt] = (use_machine({0, cnt}) & 1) ^ a[0];
    cnt++;
    if (a[cnt - 1] == 0) ZERO.push_back(cnt - 1);
    else ONE.push_back(cnt - 1);
  }
  int p1, p2;
  if (ZERO.size() >= 2) {
    p1 = ZERO[0];
    p2 = ZERO[1];
  } else {
    p1 = ONE[0];
    p2 = ONE[1];
  }

  auto solve_one = [&](int p) {
    int st = use_machine({p1, p, p2, cnt++});
    a[cnt - 1] = a[p1] ^ (st & 1);
    st -= a[cnt - 1] ^ a[p2];
    a[p] = a[p1] ^ (st > 0);
  };

  int ite = 1;
  while (a[ite] == -1) {
    solve_one(ite);
    ite++;
  }

  int ret = 0;
  vector<int> zeros, ones;
  for (int i = 0; i < cnt; i++) {
    if (a[i] == 0) zeros.push_back(i);
    else ones.push_back(i);
  }
  ret += zeros.size();

  int it = 0;
  while (cnt < n) {
    it++;
    int len = min(n - cnt, (int) max(zeros.size(), ones.size()));
    vector<int> ids = zeros.size() >= ones.size() ? zeros : ones;
    vector<int> que;
    for (int i = 0; i < len; i++) {
      que.push_back(ids[i]);
      que.push_back(cnt++);
    }

    int st = use_machine(que);

    if (ids == ones) {

      a[cnt - 1] = 1 ^ (st & 1);
      ret += a[cnt - 1] == 0;
      st -= a[cnt - 1] == 0;

      if (a[cnt - 1] == 0) zeros.push_back(cnt - 1);
      else ones.push_back(cnt - 1);

      assert(st % 2 == 0);
      ret += st >> 1;

    } else {

      a[cnt - 1] = 0 ^ (st & 1);
      ret += a[cnt - 1] == 0;
      st -= a[cnt - 1] == 1;

      if (a[cnt - 1] == 0) zeros.push_back(cnt - 1);
      else ones.push_back(cnt - 1);

      assert(st % 2 == 0);
      ret += (len - 1) - (st >> 1);

    }
  }
  return ret;
}

Subtask #1
91.8699 / 100.0

# 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 456 KB Output is correct
7 Correct 4 ms 696 KB Output is correct
8 Correct 4 ms 544 KB Output is correct
9 Correct 3 ms 536 KB Output is correct
10 Correct 4 ms 536 KB Output is correct
11 Partially correct 4 ms 548 KB Output is partially correct
12 Correct 4 ms 536 KB Output is correct
13 Correct 4 ms 796 KB Output is correct
14 Correct 2 ms 496 KB Output is correct
15 Partially correct 4 ms 548 KB Output is partially correct
16 Partially correct 4 ms 548 KB Output is partially correct
17 Correct 2 ms 492 KB Output is correct
18 Correct 3 ms 552 KB Output is correct
19 Partially correct 4 ms 540 KB Output is partially correct
20 Correct 4 ms 536 KB Output is correct
21 Correct 4 ms 536 KB Output is correct
22 Partially correct 4 ms 548 KB Output is partially correct
23 Correct 4 ms 796 KB Output is correct
24 Correct 3 ms 496 KB Output is correct
25 Partially correct 4 ms 540 KB Output is partially correct
26 Partially correct 4 ms 548 KB Output is partially correct
27 Partially correct 4 ms 552 KB Output is partially correct
28 Partially correct 4 ms 540 KB Output is partially correct
29 Partially correct 4 ms 548 KB Output is partially correct
30 Partially correct 4 ms 544 KB Output is partially correct
31 Partially correct 4 ms 548 KB Output is partially correct
32 Partially correct 4 ms 548 KB Output is partially correct
33 Partially correct 4 ms 548 KB Output is partially correct
34 Partially correct 4 ms 544 KB Output is partially correct
35 Partially correct 4 ms 548 KB Output is partially correct
36 Partially correct 4 ms 548 KB Output is partially correct
37 Partially correct 4 ms 544 KB Output is partially correct
38 Partially correct 4 ms 536 KB Output is partially correct
39 Partially correct 4 ms 540 KB Output is partially correct
40 Partially correct 4 ms 552 KB Output is partially correct
41 Partially correct 4 ms 548 KB Output is partially correct
42 Partially correct 4 ms 552 KB Output is partially correct
43 Partially correct 4 ms 544 KB Output is partially correct
44 Partially correct 4 ms 552 KB Output is partially correct
45 Partially correct 4 ms 548 KB Output is partially correct
46 Partially correct 4 ms 544 KB Output is partially correct
47 Partially correct 4 ms 544 KB Output is partially correct
48 Partially correct 4 ms 880 KB Output is partially correct
49 Partially correct 4 ms 548 KB Output is partially correct
50 Partially correct 4 ms 544 KB Output is partially correct
51 Partially correct 4 ms 548 KB Output is partially correct
52 Partially correct 4 ms 540 KB Output is partially correct
53 Partially correct 4 ms 548 KB Output is partially correct
54 Partially correct 4 ms 548 KB Output is partially correct
55 Partially correct 4 ms 544 KB Output is partially correct
56 Partially correct 4 ms 548 KB Output is partially correct
57 Partially correct 5 ms 804 KB Output is partially correct
58 Partially correct 4 ms 548 KB Output is partially correct
59 Partially correct 4 ms 544 KB Output is partially correct
60 Partially correct 4 ms 540 KB Output is partially correct
61 Partially correct 4 ms 548 KB Output is partially correct
62 Correct 0 ms 344 KB Output is correct
63 Correct 0 ms 344 KB Output is correct
64 Correct 0 ms 344 KB Output is correct
65 Correct 0 ms 344 KB Output is correct
66 Correct 0 ms 344 KB Output is correct
67 Correct 0 ms 344 KB Output is correct
68 Correct 0 ms 344 KB Output is correct
69 Correct 0 ms 344 KB Output is correct
70 Correct 0 ms 344 KB Output is correct
71 Correct 0 ms 344 KB Output is correct
72 Correct 0 ms 344 KB Output is correct
73 Correct 0 ms 344 KB Output is correct
74 Correct 0 ms 344 KB Output is correct
75 Correct 0 ms 344 KB Output is correct
76 Correct 0 ms 344 KB Output is correct
77 Correct 0 ms 344 KB Output is correct
78 Correct 0 ms 344 KB Output is correct
79 Correct 0 ms 344 KB Output is correct
80 Correct 0 ms 344 KB Output is correct
81 Correct 0 ms 344 KB Output is correct
82 Correct 0 ms 344 KB Output is correct
83 Correct 0 ms 344 KB Output is correct
84 Correct 0 ms 344 KB Output is correct
85 Correct 0 ms 344 KB Output is correct
86 Correct 0 ms 344 KB Output is correct
87 Correct 0 ms 344 KB Output is correct
88 Correct 0 ms 344 KB Output is correct
89 Correct 0 ms 344 KB Output is correct
90 Correct 0 ms 344 KB Output is correct
91 Correct 0 ms 344 KB Output is correct