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Submission #807609

# Submission time Handle Problem Language Result Execution time Memory
807609 2023-08-04T20:27:36 Z dong_liu Event Hopping (BOI22_events) C++17
100 / 100
 126 ms 16808 KB 
#include <algorithm>
#include <array>
#include <iostream>
using namespace std;

const int N = 1e5, N_ = 1 << 18, L = 17;

int main() {
  ios::sync_with_stdio(0), cin.tie(0);
  int n, q;
  cin >> n >> q;
  static int l[N], r[N], c[N * 2];
  for (int i = 0; i < n; i++) {
    cin >> l[i] >> r[i];
    c[i << 1 | 0] = l[i], c[i << 1 | 1] = r[i];
  }
  sort(c, c + n * 2);
  int m = unique(c, c + n * 2) - c;
  static array<int, 2> t[N_ * 2];
  int n_;
  n_ = 1;
  while (n_ < m) n_ <<= 1;
  for (int i = 1; i < n_ * 2; i++) t[i] = {N_, -1};
  for (int i = 0; i < n; i++) {
    l[i] = lower_bound(c, c + m, l[i]) - c;
    r[i] = lower_bound(c, c + m, r[i]) - c;
    int p = n_ + r[i];
    while (p > 0) t[p] = min(t[p], {l[i], i}), p >>= 1;
  }
  static int p[L][N];
  for (int i = 0; i < n; i++) {
    array<int, 2> x = {N_, -1};
    for (int l_ = l[i] + n_, r_ = r[i] + n_; l_ <= r_; l_ >>= 1, r_ >>= 1) {
      if ((l_ & 1) == 1) x = min(x, t[l_++]);
      if ((r_ & 1) == 0) x = min(x, t[r_--]);
    }
    p[0][i] = x[1];
  }
  for (int lg = 1; lg < L; lg++)
    for (int i = 0; i < n; i++) p[lg][i] = p[lg - 1][p[lg - 1][i]];
  while (q--) {
    int i, j;
    cin >> i >> j, i--, j--;
    if (r[j] < r[i]) {
      cout << "impossible\n";
      continue;
    }
    if (i == j) {
      cout << 0 << '\n';
      continue;
    }
    if (l[j] <= r[i] && r[i] <= r[j]) {
      cout << 1 << '\n';
      continue;
    }
    int k = 0;
    for (int lg = L - 1; lg >= 0; lg--)
      if (l[p[lg][j]] > r[i]) k += 1 << lg, j = p[lg][j];
    if (k > n) {
      cout << "impossible\n";
      continue;
    }
    cout << k + 2 << '\n';
  }
  return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 84 ms 14288 KB Output is correct
3 Correct 92 ms 14164 KB Output is correct
4 Correct 97 ms 14248 KB Output is correct
5 Correct 97 ms 14284 KB Output is correct
6 Correct 91 ms 14296 KB Output is correct
7 Correct 104 ms 14288 KB Output is correct
8 Correct 108 ms 16728 KB Output is correct
9 Correct 103 ms 16708 KB Output is correct
10 Correct 88 ms 14584 KB Output is correct
11 Correct 93 ms 16668 KB Output is correct
12 Correct 54 ms 13912 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 1 ms 532 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 1 ms 532 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 468 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 464 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 25 ms 2352 KB Output is correct
20 Correct 41 ms 2380 KB Output is correct
21 Correct 41 ms 2636 KB Output is correct
22 Correct 22 ms 2720 KB Output is correct
23 Correct 20 ms 2704 KB Output is correct
24 Correct 20 ms 2764 KB Output is correct
25 Correct 29 ms 2404 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 1 ms 328 KB Output is correct
3 Correct 1 ms 532 KB Output is correct
4 Correct 1 ms 468 KB Output is correct
5 Correct 1 ms 468 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 468 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 468 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 460 KB Output is correct
13 Correct 1 ms 468 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 468 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 58 ms 12540 KB Output is correct
20 Correct 55 ms 11608 KB Output is correct
21 Correct 68 ms 12316 KB Output is correct
22 Correct 62 ms 14460 KB Output is correct
23 Correct 75 ms 14444 KB Output is correct
24 Correct 72 ms 14564 KB Output is correct
25 Correct 21 ms 9700 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 14280 KB Output is correct
2 Correct 99 ms 14284 KB Output is correct
3 Correct 111 ms 14228 KB Output is correct
4 Correct 105 ms 16720 KB Output is correct
5 Correct 95 ms 14664 KB Output is correct
6 Correct 112 ms 16420 KB Output is correct
7 Correct 116 ms 16416 KB Output is correct
8 Correct 126 ms 16584 KB Output is correct
9 Correct 77 ms 14552 KB Output is correct
10 Correct 122 ms 16072 KB Output is correct
11 Correct 99 ms 15792 KB Output is correct
12 Correct 126 ms 16072 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 324 KB Output is correct
2 Correct 84 ms 14288 KB Output is correct
3 Correct 92 ms 14164 KB Output is correct
4 Correct 97 ms 14248 KB Output is correct
5 Correct 97 ms 14284 KB Output is correct
6 Correct 91 ms 14296 KB Output is correct
7 Correct 104 ms 14288 KB Output is correct
8 Correct 108 ms 16728 KB Output is correct
9 Correct 103 ms 16708 KB Output is correct
10 Correct 88 ms 14584 KB Output is correct
11 Correct 93 ms 16668 KB Output is correct
12 Correct 54 ms 13912 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 328 KB Output is correct
15 Correct 1 ms 532 KB Output is correct
16 Correct 1 ms 468 KB Output is correct
17 Correct 1 ms 468 KB Output is correct
18 Correct 1 ms 468 KB Output is correct
19 Correct 1 ms 468 KB Output is correct
20 Correct 1 ms 468 KB Output is correct
21 Correct 1 ms 468 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 1 ms 340 KB Output is correct
24 Correct 1 ms 468 KB Output is correct
25 Correct 1 ms 468 KB Output is correct
26 Correct 1 ms 468 KB Output is correct
27 Correct 1 ms 464 KB Output is correct
28 Correct 1 ms 468 KB Output is correct
29 Correct 1 ms 468 KB Output is correct
30 Correct 1 ms 468 KB Output is correct
31 Correct 25 ms 2352 KB Output is correct
32 Correct 41 ms 2380 KB Output is correct
33 Correct 41 ms 2636 KB Output is correct
34 Correct 22 ms 2720 KB Output is correct
35 Correct 20 ms 2704 KB Output is correct
36 Correct 20 ms 2764 KB Output is correct
37 Correct 29 ms 2404 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 1 ms 340 KB Output is correct
40 Correct 1 ms 460 KB Output is correct
41 Correct 1 ms 468 KB Output is correct
42 Correct 1 ms 468 KB Output is correct
43 Correct 1 ms 468 KB Output is correct
44 Correct 1 ms 468 KB Output is correct
45 Correct 1 ms 468 KB Output is correct
46 Correct 1 ms 468 KB Output is correct
47 Correct 58 ms 12540 KB Output is correct
48 Correct 55 ms 11608 KB Output is correct
49 Correct 68 ms 12316 KB Output is correct
50 Correct 62 ms 14460 KB Output is correct
51 Correct 75 ms 14444 KB Output is correct
52 Correct 72 ms 14564 KB Output is correct
53 Correct 21 ms 9700 KB Output is correct
54 Correct 86 ms 14280 KB Output is correct
55 Correct 99 ms 14284 KB Output is correct
56 Correct 111 ms 14228 KB Output is correct
57 Correct 105 ms 16720 KB Output is correct
58 Correct 95 ms 14664 KB Output is correct
59 Correct 112 ms 16420 KB Output is correct
60 Correct 116 ms 16416 KB Output is correct
61 Correct 126 ms 16584 KB Output is correct
62 Correct 77 ms 14552 KB Output is correct
63 Correct 122 ms 16072 KB Output is correct
64 Correct 99 ms 15792 KB Output is correct
65 Correct 126 ms 16072 KB Output is correct
66 Correct 1 ms 340 KB Output is correct
67 Correct 90 ms 14280 KB Output is correct
68 Correct 102 ms 14204 KB Output is correct
69 Correct 108 ms 14160 KB Output is correct
70 Correct 108 ms 14284 KB Output is correct
71 Correct 107 ms 14324 KB Output is correct
72 Correct 107 ms 14284 KB Output is correct
73 Correct 113 ms 16744 KB Output is correct
74 Correct 106 ms 16808 KB Output is correct
75 Correct 94 ms 14544 KB Output is correct
76 Correct 113 ms 16716 KB Output is correct
77 Correct 57 ms 13916 KB Output is correct
78 Correct 0 ms 340 KB Output is correct
79 Correct 1 ms 464 KB Output is correct
80 Correct 1 ms 468 KB Output is correct
81 Correct 1 ms 468 KB Output is correct
82 Correct 1 ms 468 KB Output is correct
83 Correct 1 ms 468 KB Output is correct
84 Correct 1 ms 464 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 27 ms 2436 KB Output is correct
87 Correct 25 ms 2388 KB Output is correct
88 Correct 31 ms 2676 KB Output is correct
89 Correct 26 ms 2696 KB Output is correct
90 Correct 21 ms 2724 KB Output is correct
91 Correct 21 ms 2728 KB Output is correct
92 Correct 22 ms 2396 KB Output is correct
93 Correct 65 ms 12500 KB Output is correct
94 Correct 57 ms 11620 KB Output is correct
95 Correct 71 ms 12340 KB Output is correct
96 Correct 71 ms 14560 KB Output is correct
97 Correct 81 ms 14448 KB Output is correct
98 Correct 73 ms 14448 KB Output is correct
99 Correct 19 ms 9700 KB Output is correct
100 Correct 100 ms 16472 KB Output is correct
101 Correct 102 ms 16396 KB Output is correct
102 Correct 102 ms 16476 KB Output is correct
103 Correct 98 ms 16048 KB Output is correct
104 Correct 101 ms 15880 KB Output is correct
105 Correct 99 ms 16048 KB Output is correct
106 Correct 86 ms 13628 KB Output is correct
107 Correct 96 ms 13644 KB Output is correct
108 Correct 92 ms 14392 KB Output is correct
109 Correct 104 ms 14280 KB Output is correct
110 Correct 103 ms 16336 KB Output is correct
111 Correct 104 ms 16356 KB Output is correct