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Submission #646866

# Submission time Handle Problem Language Result Execution time Memory
646866 2022-09-30T21:58:27 Z chenwz Abracadabra (CEOI22_abracadabra) C++11
100 / 100
 574 ms 34232 KB 
// CEOI 2022 Day1 - Abracadabra
#include <bits/stdc++.h>
using namespace std;
using VI = vector<int>;
struct BIT {
  VI C;
  int n;
  BIT(int _n) : C(_n + 1), n(_n + 1) {}
  void add(int x, int v) {
    while (x < n) C[x] += v, x += x & -x;
  }
  int sum(int x) {
    int ret = 0;
    while (x) ret += C[x], x -= x & -x;
    return ret;
  }
  int kth(int x) {
    int pos = 0;
    for (int b = 1 << 17; b >= 1; b >>= 1)
      if (pos + b < n && C[pos + b] < x) pos += b, x -= C[pos];
    return pos + 1;
  }
};
int main() {
  ios::sync_with_stdio(false), cin.tie(0);
  int N, q;
  cin >> N >> q;
  BIT S(N);
  VI A(N), P(N + 1), Ans(q);
  vector<vector<pair<int, int>>> v(N + 1);
  for (int i = 0; i < N; i++) cin >> A[i], P[A[i]] = i;
  for (int i = 0, t, x; i < q; i++) {
    cin >> t >> x, t = min(t, N);
    if (t == 0)
      Ans[i] = A[x - 1];
    else
      v[t].emplace_back(x - 1, i);
  }
  VI nxt(N), ds(N + 1);
  auto SetVal = [&](int x, int v) { S.add(x, v - ds[x]), ds[x] = v; };
  for (int i = 0; i < N;) {
    int j = i + 1;
    while (j < N && A[j] < A[i]) j++;
    SetVal(A[i], j - i), i = j;
  }
  VI v2;
  for (int i = N - 1; i >= 0; i--) {
    while (!v2.empty() && A[v2.back()] < A[i]) v2.pop_back();
    nxt[i] = !v2.empty() ? v2.back() : N, v2.push_back(i);
  }
  for (int i = 1; i <= N; i++) {
    int itf = S.kth(N / 2 + 1), its = ds[itf], sum = S.sum(itf - 1);
    if (sum < N / 2) {
      int l = P[itf], r = l + its;
      SetVal(A[l], N / 2 - sum);
      l += N / 2 - sum;
      for (int i = l; i < r; i = nxt[i]) SetVal(A[i], min(r, nxt[i]) - i);
    }
    for (auto p : v[i]) {
      int pos = p.first, idx = p.second, qos = S.kth(pos + 1),
          sum = S.sum(qos - 1);
      Ans[idx] = A[P[qos] + pos - sum];
    }
  }
  for (int x : Ans) cout << x << "\n";
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 242 ms 18448 KB Output is correct
2 Correct 251 ms 17128 KB Output is correct
3 Correct 231 ms 16680 KB Output is correct
4 Correct 188 ms 15424 KB Output is correct
5 Correct 214 ms 18764 KB Output is correct
6 Correct 198 ms 19152 KB Output is correct
7 Correct 232 ms 19736 KB Output is correct
8 Correct 201 ms 17744 KB Output is correct
9 Correct 210 ms 16668 KB Output is correct
10 Correct 202 ms 16500 KB Output is correct
11 Correct 202 ms 16800 KB Output is correct
12 Correct 196 ms 13928 KB Output is correct
13 Correct 197 ms 15692 KB Output is correct
14 Correct 220 ms 18300 KB Output is correct
15 Correct 216 ms 15660 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 177 ms 8072 KB Output is correct
18 Correct 177 ms 11748 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 294 ms 27128 KB Output is correct
2 Correct 301 ms 28736 KB Output is correct
3 Correct 220 ms 23776 KB Output is correct
4 Correct 228 ms 23032 KB Output is correct
5 Correct 259 ms 23412 KB Output is correct
6 Correct 219 ms 22540 KB Output is correct
7 Correct 295 ms 26984 KB Output is correct
8 Correct 266 ms 25780 KB Output is correct
9 Correct 235 ms 23308 KB Output is correct
10 Correct 268 ms 25788 KB Output is correct
11 Correct 225 ms 23256 KB Output is correct
12 Correct 223 ms 22476 KB Output is correct
13 Correct 264 ms 25960 KB Output is correct
14 Correct 231 ms 23252 KB Output is correct
15 Correct 267 ms 26492 KB Output is correct
16 Correct 27 ms 8788 KB Output is correct
17 Correct 193 ms 19464 KB Output is correct
18 Correct 181 ms 22648 KB Output is correct
19 Correct 75 ms 10824 KB Output is correct
20 Correct 82 ms 11936 KB Output is correct

Subtask #3
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 58 ms 7720 KB Output is correct
2 Correct 61 ms 7516 KB Output is correct
3 Correct 57 ms 7400 KB Output is correct
4 Correct 55 ms 6780 KB Output is correct
5 Correct 48 ms 7240 KB Output is correct
6 Correct 42 ms 6780 KB Output is correct
7 Correct 46 ms 7104 KB Output is correct
8 Correct 49 ms 6772 KB Output is correct
9 Correct 49 ms 7116 KB Output is correct
10 Correct 38 ms 6580 KB Output is correct
11 Correct 40 ms 6880 KB Output is correct
12 Correct 38 ms 6652 KB Output is correct
13 Correct 38 ms 6476 KB Output is correct
14 Correct 45 ms 6876 KB Output is correct
15 Correct 36 ms 6648 KB Output is correct
16 Correct 13 ms 4564 KB Output is correct
17 Correct 32 ms 5884 KB Output is correct
18 Correct 32 ms 5892 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct

Subtask #4
25.0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 242 ms 18448 KB Output is correct
2 Correct 251 ms 17128 KB Output is correct
3 Correct 231 ms 16680 KB Output is correct
4 Correct 188 ms 15424 KB Output is correct
5 Correct 214 ms 18764 KB Output is correct
6 Correct 198 ms 19152 KB Output is correct
7 Correct 232 ms 19736 KB Output is correct
8 Correct 201 ms 17744 KB Output is correct
9 Correct 210 ms 16668 KB Output is correct
10 Correct 202 ms 16500 KB Output is correct
11 Correct 202 ms 16800 KB Output is correct
12 Correct 196 ms 13928 KB Output is correct
13 Correct 197 ms 15692 KB Output is correct
14 Correct 220 ms 18300 KB Output is correct
15 Correct 216 ms 15660 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 177 ms 8072 KB Output is correct
18 Correct 177 ms 11748 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct
21 Correct 294 ms 27128 KB Output is correct
22 Correct 301 ms 28736 KB Output is correct
23 Correct 220 ms 23776 KB Output is correct
24 Correct 228 ms 23032 KB Output is correct
25 Correct 259 ms 23412 KB Output is correct
26 Correct 219 ms 22540 KB Output is correct
27 Correct 295 ms 26984 KB Output is correct
28 Correct 266 ms 25780 KB Output is correct
29 Correct 235 ms 23308 KB Output is correct
30 Correct 268 ms 25788 KB Output is correct
31 Correct 225 ms 23256 KB Output is correct
32 Correct 223 ms 22476 KB Output is correct
33 Correct 264 ms 25960 KB Output is correct
34 Correct 231 ms 23252 KB Output is correct
35 Correct 267 ms 26492 KB Output is correct
36 Correct 27 ms 8788 KB Output is correct
37 Correct 193 ms 19464 KB Output is correct
38 Correct 181 ms 22648 KB Output is correct
39 Correct 75 ms 10824 KB Output is correct
40 Correct 82 ms 11936 KB Output is correct
41 Correct 58 ms 7720 KB Output is correct
42 Correct 61 ms 7516 KB Output is correct
43 Correct 57 ms 7400 KB Output is correct
44 Correct 55 ms 6780 KB Output is correct
45 Correct 48 ms 7240 KB Output is correct
46 Correct 42 ms 6780 KB Output is correct
47 Correct 46 ms 7104 KB Output is correct
48 Correct 49 ms 6772 KB Output is correct
49 Correct 49 ms 7116 KB Output is correct
50 Correct 38 ms 6580 KB Output is correct
51 Correct 40 ms 6880 KB Output is correct
52 Correct 38 ms 6652 KB Output is correct
53 Correct 38 ms 6476 KB Output is correct
54 Correct 45 ms 6876 KB Output is correct
55 Correct 36 ms 6648 KB Output is correct
56 Correct 13 ms 4564 KB Output is correct
57 Correct 32 ms 5884 KB Output is correct
58 Correct 32 ms 5892 KB Output is correct
59 Correct 0 ms 212 KB Output is correct
60 Correct 0 ms 212 KB Output is correct
61 Correct 574 ms 34232 KB Output is correct
62 Correct 492 ms 33512 KB Output is correct
63 Correct 498 ms 32596 KB Output is correct
64 Correct 387 ms 31692 KB Output is correct
65 Correct 395 ms 33060 KB Output is correct
66 Correct 381 ms 31660 KB Output is correct
67 Correct 354 ms 31216 KB Output is correct
68 Correct 349 ms 29844 KB Output is correct
69 Correct 381 ms 32156 KB Output is correct
70 Correct 339 ms 28828 KB Output is correct
71 Correct 290 ms 31564 KB Output is correct
72 Correct 333 ms 29332 KB Output is correct
73 Correct 309 ms 30104 KB Output is correct
74 Correct 329 ms 31532 KB Output is correct
75 Correct 385 ms 30448 KB Output is correct
76 Correct 27 ms 8788 KB Output is correct
77 Correct 238 ms 19704 KB Output is correct
78 Correct 268 ms 22428 KB Output is correct
79 Correct 0 ms 212 KB Output is correct
80 Correct 0 ms 212 KB Output is correct