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답안 #744619

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
744619 2023-05-18T20:15:23 Z tch1cherin Abracadabra (CEOI22_abracadabra) C++17
100 / 100
 604 ms 48124 KB 
#include <bits/stdc++.h>
using namespace std;

struct fenwick {
  int size, logn;
  vector<int> fenw;

  fenwick(int n) : size(n), logn(__lg(n)), fenw(n + 1) {}

  void add(int i, int v) {
    for (i++; i <= size; i += i & -i) {
      fenw[i] += v;
    }
  }

  int query(int r) {
    int ans = 0;
    for (; r > 0; r -= r & -r) {
      ans += fenw[r];
    }
    return ans;
  }

  int lower_bound(int s) {
    int pos = 0;
    for (int delta = 1 << logn; delta > 0; delta /= 2) {
      if (pos + delta <= size && fenw[pos + delta] < s) {
        pos += delta;
        s -= fenw[pos];
      }
    }
    return pos;
  }
};

void solve() {
  int n, q;
  cin >> n >> q;
  vector<int> a(n);
  for (int &v : a) {
    cin >> v;
    v--;
  }
  int X = n;
  vector<vector<pair<int, int>>> queries(X);
  for (int i = 0; i < q; i++) {
    int t, p;
    cin >> t >> p;
    p--, t = min(t, X - 1);
    queries[t].emplace_back(i, p);
  }
  vector<int> nxt(n);
  stack<int> st;
  for (int i = n - 1; i >= 0; i--) {
    while (!st.empty() && a[st.top()] < a[i]) {
      st.pop();
    }
    nxt[i] = st.empty() ? n : st.top();
    st.push(i);
  }
  vector<int> answer(q);
  for (auto [i, p] : queries[0]) {
    answer[i] = a[p];  
  }
  fenwick fenw(n);
  vector<int> l(n), r(n);
  int pos = 0;
  while (pos != n) {
    int go = nxt[pos];
    if (pos < n / 2 && go > n / 2) {
      go = n / 2;
    }
    l[a[pos]] = pos;
    r[a[pos]] = go;
    fenw.add(a[pos], go - pos);
    pos = go;
  }
  for (int t = 1; t < X; t++) {
    for (auto [i, p] : queries[t]) {
      int j = fenw.lower_bound(p + 1);
      int sum = fenw.query(j + 1);
      answer[i] = a[r[j] - (sum - p)];
    }
    int j = fenw.lower_bound(n / 2); 
    int sum = fenw.query(j + 1);
    if (sum != 0) {
      int first = r[j] - (sum - n / 2), right = r[j];
      fenw.add(j, first - r[j]);
      r[j] = first;
      while (first != right) {
        int go = min(right, nxt[first]);
        l[a[first]] = first;
        r[a[first]] = go;
        fenw.add(a[first], go - first);
        first = go;
      }
    }
  }
  for (int v : answer) {
    cout << 1 + v << "\n";
  }
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  solve();
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 250 ms 26060 KB Output is correct
2 Correct 272 ms 24732 KB Output is correct
3 Correct 247 ms 24056 KB Output is correct
4 Correct 204 ms 21924 KB Output is correct
5 Correct 217 ms 26068 KB Output is correct
6 Correct 210 ms 25880 KB Output is correct
7 Correct 238 ms 27252 KB Output is correct
8 Correct 206 ms 24524 KB Output is correct
9 Correct 207 ms 23600 KB Output is correct
10 Correct 211 ms 23156 KB Output is correct
11 Correct 228 ms 23528 KB Output is correct
12 Correct 200 ms 20980 KB Output is correct
13 Correct 219 ms 22480 KB Output is correct
14 Correct 252 ms 25532 KB Output is correct
15 Correct 222 ms 23292 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 182 ms 21136 KB Output is correct
18 Correct 207 ms 21172 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct

Subtask #2
40.0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Correct 324 ms 41456 KB Output is correct
2 Correct 325 ms 41084 KB Output is correct
3 Correct 248 ms 33804 KB Output is correct
4 Correct 259 ms 33624 KB Output is correct
5 Correct 249 ms 34496 KB Output is correct
6 Correct 267 ms 33084 KB Output is correct
7 Correct 311 ms 40356 KB Output is correct
8 Correct 293 ms 38596 KB Output is correct
9 Correct 279 ms 34332 KB Output is correct
10 Correct 286 ms 37544 KB Output is correct
11 Correct 227 ms 32556 KB Output is correct
12 Correct 239 ms 32196 KB Output is correct
13 Correct 272 ms 36912 KB Output is correct
14 Correct 250 ms 33364 KB Output is correct
15 Correct 300 ms 38532 KB Output is correct
16 Correct 27 ms 10064 KB Output is correct
17 Correct 229 ms 35956 KB Output is correct
18 Correct 204 ms 30208 KB Output is correct
19 Correct 68 ms 15172 KB Output is correct
20 Correct 95 ms 16480 KB Output is correct

Subtask #3
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 59 ms 9368 KB Output is correct
2 Correct 59 ms 9144 KB Output is correct
3 Correct 62 ms 8920 KB Output is correct
4 Correct 44 ms 8472 KB Output is correct
5 Correct 51 ms 8968 KB Output is correct
6 Correct 44 ms 8396 KB Output is correct
7 Correct 48 ms 8900 KB Output is correct
8 Correct 49 ms 8452 KB Output is correct
9 Correct 48 ms 8708 KB Output is correct
10 Correct 38 ms 8076 KB Output is correct
11 Correct 41 ms 8396 KB Output is correct
12 Correct 39 ms 8140 KB Output is correct
13 Correct 41 ms 8028 KB Output is correct
14 Correct 44 ms 8312 KB Output is correct
15 Correct 38 ms 8120 KB Output is correct
16 Correct 14 ms 5076 KB Output is correct
17 Correct 36 ms 7752 KB Output is correct
18 Correct 32 ms 7600 KB Output is correct
19 Correct 1 ms 212 KB Output is correct
20 Correct 1 ms 212 KB Output is correct

Subtask #4
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 250 ms 26060 KB Output is correct
2 Correct 272 ms 24732 KB Output is correct
3 Correct 247 ms 24056 KB Output is correct
4 Correct 204 ms 21924 KB Output is correct
5 Correct 217 ms 26068 KB Output is correct
6 Correct 210 ms 25880 KB Output is correct
7 Correct 238 ms 27252 KB Output is correct
8 Correct 206 ms 24524 KB Output is correct
9 Correct 207 ms 23600 KB Output is correct
10 Correct 211 ms 23156 KB Output is correct
11 Correct 228 ms 23528 KB Output is correct
12 Correct 200 ms 20980 KB Output is correct
13 Correct 219 ms 22480 KB Output is correct
14 Correct 252 ms 25532 KB Output is correct
15 Correct 222 ms 23292 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 182 ms 21136 KB Output is correct
18 Correct 207 ms 21172 KB Output is correct
19 Correct 0 ms 212 KB Output is correct
20 Correct 0 ms 212 KB Output is correct
21 Correct 324 ms 41456 KB Output is correct
22 Correct 325 ms 41084 KB Output is correct
23 Correct 248 ms 33804 KB Output is correct
24 Correct 259 ms 33624 KB Output is correct
25 Correct 249 ms 34496 KB Output is correct
26 Correct 267 ms 33084 KB Output is correct
27 Correct 311 ms 40356 KB Output is correct
28 Correct 293 ms 38596 KB Output is correct
29 Correct 279 ms 34332 KB Output is correct
30 Correct 286 ms 37544 KB Output is correct
31 Correct 227 ms 32556 KB Output is correct
32 Correct 239 ms 32196 KB Output is correct
33 Correct 272 ms 36912 KB Output is correct
34 Correct 250 ms 33364 KB Output is correct
35 Correct 300 ms 38532 KB Output is correct
36 Correct 27 ms 10064 KB Output is correct
37 Correct 229 ms 35956 KB Output is correct
38 Correct 204 ms 30208 KB Output is correct
39 Correct 68 ms 15172 KB Output is correct
40 Correct 95 ms 16480 KB Output is correct
41 Correct 59 ms 9368 KB Output is correct
42 Correct 59 ms 9144 KB Output is correct
43 Correct 62 ms 8920 KB Output is correct
44 Correct 44 ms 8472 KB Output is correct
45 Correct 51 ms 8968 KB Output is correct
46 Correct 44 ms 8396 KB Output is correct
47 Correct 48 ms 8900 KB Output is correct
48 Correct 49 ms 8452 KB Output is correct
49 Correct 48 ms 8708 KB Output is correct
50 Correct 38 ms 8076 KB Output is correct
51 Correct 41 ms 8396 KB Output is correct
52 Correct 39 ms 8140 KB Output is correct
53 Correct 41 ms 8028 KB Output is correct
54 Correct 44 ms 8312 KB Output is correct
55 Correct 38 ms 8120 KB Output is correct
56 Correct 14 ms 5076 KB Output is correct
57 Correct 36 ms 7752 KB Output is correct
58 Correct 32 ms 7600 KB Output is correct
59 Correct 1 ms 212 KB Output is correct
60 Correct 1 ms 212 KB Output is correct
61 Correct 604 ms 48124 KB Output is correct
62 Correct 533 ms 46760 KB Output is correct
63 Correct 526 ms 45136 KB Output is correct
64 Correct 392 ms 44300 KB Output is correct
65 Correct 424 ms 46408 KB Output is correct
66 Correct 383 ms 44204 KB Output is correct
67 Correct 388 ms 43996 KB Output is correct
68 Correct 390 ms 42164 KB Output is correct
69 Correct 429 ms 44460 KB Output is correct
70 Correct 345 ms 40516 KB Output is correct
71 Correct 302 ms 42056 KB Output is correct
72 Correct 345 ms 41004 KB Output is correct
73 Correct 325 ms 41548 KB Output is correct
74 Correct 343 ms 43604 KB Output is correct
75 Correct 341 ms 42160 KB Output is correct
76 Correct 28 ms 10060 KB Output is correct
77 Correct 236 ms 36296 KB Output is correct
78 Correct 250 ms 35316 KB Output is correct
79 Correct 1 ms 212 KB Output is correct
80 Correct 1 ms 340 KB Output is correct