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Submission #894244

# Submission time Handle Problem Language Result Execution time Memory
894244 2023-12-28T03:06:10 Z box Event Hopping (BOI22_events) C++17
100 / 100
 128 ms 17048 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 8904 KB Output is correct
2 Correct 113 ms 15948 KB Output is correct
3 Correct 91 ms 15944 KB Output is correct
4 Correct 108 ms 15952 KB Output is correct
5 Correct 103 ms 16196 KB Output is correct
6 Correct 91 ms 16140 KB Output is correct
7 Correct 90 ms 16208 KB Output is correct
8 Correct 104 ms 16800 KB Output is correct
9 Correct 107 ms 17048 KB Output is correct
10 Correct 85 ms 16464 KB Output is correct
11 Correct 97 ms 16776 KB Output is correct
12 Correct 49 ms 15860 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8708 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 2 ms 8536 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 2 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8708 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 2 ms 8536 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 2 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 1 ms 8540 KB Output is correct
12 Correct 2 ms 8704 KB Output is correct
13 Correct 2 ms 8540 KB Output is correct
14 Correct 2 ms 8660 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 2 ms 8672 KB Output is correct
17 Correct 2 ms 8540 KB Output is correct
18 Correct 2 ms 8540 KB Output is correct
19 Correct 29 ms 10064 KB Output is correct
20 Correct 26 ms 10064 KB Output is correct
21 Correct 26 ms 10324 KB Output is correct
22 Correct 21 ms 10432 KB Output is correct
23 Correct 20 ms 10376 KB Output is correct
24 Correct 32 ms 10328 KB Output is correct
25 Correct 24 ms 10072 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 8540 KB Output is correct
2 Correct 1 ms 8540 KB Output is correct
3 Correct 2 ms 8708 KB Output is correct
4 Correct 2 ms 8540 KB Output is correct
5 Correct 2 ms 8540 KB Output is correct
6 Correct 2 ms 8536 KB Output is correct
7 Correct 2 ms 8540 KB Output is correct
8 Correct 2 ms 8540 KB Output is correct
9 Correct 1 ms 8540 KB Output is correct
10 Correct 1 ms 8540 KB Output is correct
11 Correct 2 ms 8540 KB Output is correct
12 Correct 2 ms 8716 KB Output is correct
13 Correct 2 ms 8540 KB Output is correct
14 Correct 2 ms 8704 KB Output is correct
15 Correct 2 ms 8540 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 8540 KB Output is correct
18 Correct 2 ms 8540 KB Output is correct
19 Correct 73 ms 12668 KB Output is correct
20 Correct 70 ms 13400 KB Output is correct
21 Correct 68 ms 14108 KB Output is correct
22 Correct 68 ms 14472 KB Output is correct
23 Correct 82 ms 14508 KB Output is correct
24 Correct 76 ms 14504 KB Output is correct
25 Correct 28 ms 11452 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 80 ms 15956 KB Output is correct
2 Correct 90 ms 16084 KB Output is correct
3 Correct 123 ms 16132 KB Output is correct
4 Correct 113 ms 16796 KB Output is correct
5 Correct 88 ms 16528 KB Output is correct
6 Correct 110 ms 16524 KB Output is correct
7 Correct 115 ms 16536 KB Output is correct
8 Correct 92 ms 16536 KB Output is correct
9 Correct 78 ms 14516 KB Output is correct
10 Correct 103 ms 16112 KB Output is correct
11 Correct 112 ms 16028 KB Output is correct
12 Correct 95 ms 16204 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 8904 KB Output is correct
2 Correct 113 ms 15948 KB Output is correct
3 Correct 91 ms 15944 KB Output is correct
4 Correct 108 ms 15952 KB Output is correct
5 Correct 103 ms 16196 KB Output is correct
6 Correct 91 ms 16140 KB Output is correct
7 Correct 90 ms 16208 KB Output is correct
8 Correct 104 ms 16800 KB Output is correct
9 Correct 107 ms 17048 KB Output is correct
10 Correct 85 ms 16464 KB Output is correct
11 Correct 97 ms 16776 KB Output is correct
12 Correct 49 ms 15860 KB Output is correct
13 Correct 2 ms 8540 KB Output is correct
14 Correct 1 ms 8540 KB Output is correct
15 Correct 2 ms 8708 KB Output is correct
16 Correct 2 ms 8540 KB Output is correct
17 Correct 2 ms 8540 KB Output is correct
18 Correct 2 ms 8536 KB Output is correct
19 Correct 2 ms 8540 KB Output is correct
20 Correct 2 ms 8540 KB Output is correct
21 Correct 1 ms 8540 KB Output is correct
22 Correct 1 ms 8540 KB Output is correct
23 Correct 1 ms 8540 KB Output is correct
24 Correct 2 ms 8704 KB Output is correct
25 Correct 2 ms 8540 KB Output is correct
26 Correct 2 ms 8660 KB Output is correct
27 Correct 2 ms 8540 KB Output is correct
28 Correct 2 ms 8672 KB Output is correct
29 Correct 2 ms 8540 KB Output is correct
30 Correct 2 ms 8540 KB Output is correct
31 Correct 29 ms 10064 KB Output is correct
32 Correct 26 ms 10064 KB Output is correct
33 Correct 26 ms 10324 KB Output is correct
34 Correct 21 ms 10432 KB Output is correct
35 Correct 20 ms 10376 KB Output is correct
36 Correct 32 ms 10328 KB Output is correct
37 Correct 24 ms 10072 KB Output is correct
38 Correct 1 ms 8540 KB Output is correct
39 Correct 2 ms 8540 KB Output is correct
40 Correct 2 ms 8716 KB Output is correct
41 Correct 2 ms 8540 KB Output is correct
42 Correct 2 ms 8704 KB Output is correct
43 Correct 2 ms 8540 KB Output is correct
44 Correct 2 ms 8540 KB Output is correct
45 Correct 2 ms 8540 KB Output is correct
46 Correct 2 ms 8540 KB Output is correct
47 Correct 73 ms 12668 KB Output is correct
48 Correct 70 ms 13400 KB Output is correct
49 Correct 68 ms 14108 KB Output is correct
50 Correct 68 ms 14472 KB Output is correct
51 Correct 82 ms 14508 KB Output is correct
52 Correct 76 ms 14504 KB Output is correct
53 Correct 28 ms 11452 KB Output is correct
54 Correct 80 ms 15956 KB Output is correct
55 Correct 90 ms 16084 KB Output is correct
56 Correct 123 ms 16132 KB Output is correct
57 Correct 113 ms 16796 KB Output is correct
58 Correct 88 ms 16528 KB Output is correct
59 Correct 110 ms 16524 KB Output is correct
60 Correct 115 ms 16536 KB Output is correct
61 Correct 92 ms 16536 KB Output is correct
62 Correct 78 ms 14516 KB Output is correct
63 Correct 103 ms 16112 KB Output is correct
64 Correct 112 ms 16028 KB Output is correct
65 Correct 95 ms 16204 KB Output is correct
66 Correct 1 ms 8552 KB Output is correct
67 Correct 82 ms 15960 KB Output is correct
68 Correct 94 ms 16036 KB Output is correct
69 Correct 106 ms 15940 KB Output is correct
70 Correct 94 ms 16212 KB Output is correct
71 Correct 104 ms 16180 KB Output is correct
72 Correct 112 ms 16200 KB Output is correct
73 Correct 112 ms 16780 KB Output is correct
74 Correct 110 ms 16780 KB Output is correct
75 Correct 128 ms 16720 KB Output is correct
76 Correct 89 ms 16776 KB Output is correct
77 Correct 48 ms 15860 KB Output is correct
78 Correct 1 ms 8540 KB Output is correct
79 Correct 2 ms 8840 KB Output is correct
80 Correct 2 ms 8540 KB Output is correct
81 Correct 1 ms 8540 KB Output is correct
82 Correct 2 ms 8536 KB Output is correct
83 Correct 2 ms 8696 KB Output is correct
84 Correct 2 ms 8716 KB Output is correct
85 Correct 2 ms 8540 KB Output is correct
86 Correct 31 ms 10016 KB Output is correct
87 Correct 33 ms 10284 KB Output is correct
88 Correct 31 ms 10300 KB Output is correct
89 Correct 24 ms 10580 KB Output is correct
90 Correct 21 ms 10320 KB Output is correct
91 Correct 29 ms 10320 KB Output is correct
92 Correct 35 ms 10068 KB Output is correct
93 Correct 63 ms 14220 KB Output is correct
94 Correct 53 ms 13404 KB Output is correct
95 Correct 63 ms 14112 KB Output is correct
96 Correct 61 ms 14676 KB Output is correct
97 Correct 72 ms 14696 KB Output is correct
98 Correct 70 ms 14704 KB Output is correct
99 Correct 28 ms 11420 KB Output is correct
100 Correct 107 ms 16404 KB Output is correct
101 Correct 100 ms 16540 KB Output is correct
102 Correct 103 ms 16524 KB Output is correct
103 Correct 100 ms 16012 KB Output is correct
104 Correct 112 ms 16008 KB Output is correct
105 Correct 102 ms 16012 KB Output is correct
106 Correct 84 ms 15440 KB Output is correct
107 Correct 89 ms 15448 KB Output is correct
108 Correct 97 ms 16076 KB Output is correct
109 Correct 100 ms 16052 KB Output is correct
110 Correct 109 ms 16484 KB Output is correct
111 Correct 111 ms 16328 KB Output is correct