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Submission #845003

# Submission time Handle Problem Language Result Execution time Memory
845003 2023-09-06T10:44:54 Z Alora Event Hopping (BOI22_events) C++17
100 / 100
 309 ms 22980 KB 
#include <bits/stdc++.h>
#define st first
#define nd second
using namespace std;
const int LG = 17;

int main() {
  int n, q; cin >> n >> q;
  vector<vector<int>> nx(LG);
  vector<vector<pair<int, int>>> rmq(LG);
  for (int i = 0; i < LG; i++)
    nx[i].resize(n), rmq[i].resize(n, {1'000'000'001, -1});
  vector<pair<int, int>> a(n);
  vector<int> b;
  for (int i = 0; i < n; i++) {
    cin >> a[i].st >> a[i].nd;
    b.push_back(a[i].nd);
  }
  sort(b.begin(), b.end());
  b.erase(unique(b.begin(), b.end()), b.end());
  for (int i = 0; i < n; i++) {
    int r = lower_bound(b.begin(), b.end(), a[i].nd) - b.begin();
    rmq[0][r] = min(rmq[0][r], {a[i].st, i});
  }
  for (int i = 0; i + 1 < LG; i++)
    for (int j = 0; j + (1 << (i + 1)) <= n; j++)
      rmq[i + 1][j] = min(rmq[i][j], rmq[i][j + (1 << i)]);
  for (int i = 0; i < n; i++) {
    int l = lower_bound(b.begin(), b.end(), a[i].st) - b.begin();
    int r = lower_bound(b.begin(), b.end(), a[i].nd) - b.begin();
    int h = 31 - __builtin_clz(r - l + 1);
    nx[0][i] = min(rmq[h][l], rmq[h][r + 1 - (1 << h)]).nd;
  }
  for (int i = 0; i + 1 < LG; i++)
    for (int j = 0; j < n; j++)
      nx[i + 1][j] = nx[i][nx[i][j]];
  while (q--) {
    int x, y, l = 1; cin >> x >> y; x--, y--;
    if (x == y || (a[y].st <= a[x].nd && a[x].nd <= a[y].nd)) {
      cout << (x == y ? 0 : 1) << "\n";
      continue;
    }
    for (int i = LG - 1; ~i; i--) {
      if (a[x].nd < a[nx[i][y]].st)
        l += 1 << i, y = nx[i][y];
    }
    y = nx[0][y];
    if (a[x].nd < a[y].st || a[x].nd > a[y].nd)
      cout << "impossible\n";
    else
      cout << l + 1 << "\n";
  }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 260 ms 22308 KB Output is correct
3 Correct 263 ms 22140 KB Output is correct
4 Correct 288 ms 22220 KB Output is correct
5 Correct 279 ms 22212 KB Output is correct
6 Correct 276 ms 22220 KB Output is correct
7 Correct 281 ms 22296 KB Output is correct
8 Correct 276 ms 22732 KB Output is correct
9 Correct 282 ms 22820 KB Output is correct
10 Correct 277 ms 22476 KB Output is correct
11 Correct 284 ms 22660 KB Output is correct
12 Correct 226 ms 22856 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 1 ms 600 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 1 ms 604 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 161 ms 1964 KB Output is correct
20 Correct 163 ms 1872 KB Output is correct
21 Correct 167 ms 2084 KB Output is correct
22 Correct 158 ms 2132 KB Output is correct
23 Correct 158 ms 2108 KB Output is correct
24 Correct 157 ms 2088 KB Output is correct
25 Correct 159 ms 2092 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 604 KB Output is correct
4 Correct 1 ms 604 KB Output is correct
5 Correct 1 ms 600 KB Output is correct
6 Correct 1 ms 604 KB Output is correct
7 Correct 1 ms 604 KB Output is correct
8 Correct 1 ms 604 KB Output is correct
9 Correct 1 ms 604 KB Output is correct
10 Correct 0 ms 344 KB Output is correct
11 Correct 1 ms 348 KB Output is correct
12 Correct 1 ms 604 KB Output is correct
13 Correct 1 ms 604 KB Output is correct
14 Correct 1 ms 604 KB Output is correct
15 Correct 1 ms 604 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 604 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 101 ms 21776 KB Output is correct
20 Correct 84 ms 21744 KB Output is correct
21 Correct 95 ms 21712 KB Output is correct
22 Correct 109 ms 22484 KB Output is correct
23 Correct 92 ms 21860 KB Output is correct
24 Correct 102 ms 21828 KB Output is correct
25 Correct 53 ms 21720 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 270 ms 22536 KB Output is correct
2 Correct 271 ms 22320 KB Output is correct
3 Correct 309 ms 22364 KB Output is correct
4 Correct 274 ms 22980 KB Output is correct
5 Correct 283 ms 22732 KB Output is correct
6 Correct 276 ms 22388 KB Output is correct
7 Correct 279 ms 22476 KB Output is correct
8 Correct 277 ms 22476 KB Output is correct
9 Correct 94 ms 21860 KB Output is correct
10 Correct 287 ms 21964 KB Output is correct
11 Correct 259 ms 21944 KB Output is correct
12 Correct 273 ms 21948 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 260 ms 22308 KB Output is correct
3 Correct 263 ms 22140 KB Output is correct
4 Correct 288 ms 22220 KB Output is correct
5 Correct 279 ms 22212 KB Output is correct
6 Correct 276 ms 22220 KB Output is correct
7 Correct 281 ms 22296 KB Output is correct
8 Correct 276 ms 22732 KB Output is correct
9 Correct 282 ms 22820 KB Output is correct
10 Correct 277 ms 22476 KB Output is correct
11 Correct 284 ms 22660 KB Output is correct
12 Correct 226 ms 22856 KB Output is correct
13 Correct 0 ms 348 KB Output is correct
14 Correct 0 ms 348 KB Output is correct
15 Correct 1 ms 604 KB Output is correct
16 Correct 1 ms 604 KB Output is correct
17 Correct 1 ms 600 KB Output is correct
18 Correct 1 ms 604 KB Output is correct
19 Correct 1 ms 604 KB Output is correct
20 Correct 1 ms 604 KB Output is correct
21 Correct 1 ms 604 KB Output is correct
22 Correct 0 ms 348 KB Output is correct
23 Correct 0 ms 348 KB Output is correct
24 Correct 1 ms 604 KB Output is correct
25 Correct 1 ms 600 KB Output is correct
26 Correct 1 ms 604 KB Output is correct
27 Correct 1 ms 604 KB Output is correct
28 Correct 1 ms 604 KB Output is correct
29 Correct 1 ms 604 KB Output is correct
30 Correct 1 ms 604 KB Output is correct
31 Correct 161 ms 1964 KB Output is correct
32 Correct 163 ms 1872 KB Output is correct
33 Correct 167 ms 2084 KB Output is correct
34 Correct 158 ms 2132 KB Output is correct
35 Correct 158 ms 2108 KB Output is correct
36 Correct 157 ms 2088 KB Output is correct
37 Correct 159 ms 2092 KB Output is correct
38 Correct 0 ms 344 KB Output is correct
39 Correct 1 ms 348 KB Output is correct
40 Correct 1 ms 604 KB Output is correct
41 Correct 1 ms 604 KB Output is correct
42 Correct 1 ms 604 KB Output is correct
43 Correct 1 ms 604 KB Output is correct
44 Correct 1 ms 604 KB Output is correct
45 Correct 1 ms 604 KB Output is correct
46 Correct 1 ms 604 KB Output is correct
47 Correct 101 ms 21776 KB Output is correct
48 Correct 84 ms 21744 KB Output is correct
49 Correct 95 ms 21712 KB Output is correct
50 Correct 109 ms 22484 KB Output is correct
51 Correct 92 ms 21860 KB Output is correct
52 Correct 102 ms 21828 KB Output is correct
53 Correct 53 ms 21720 KB Output is correct
54 Correct 270 ms 22536 KB Output is correct
55 Correct 271 ms 22320 KB Output is correct
56 Correct 309 ms 22364 KB Output is correct
57 Correct 274 ms 22980 KB Output is correct
58 Correct 283 ms 22732 KB Output is correct
59 Correct 276 ms 22388 KB Output is correct
60 Correct 279 ms 22476 KB Output is correct
61 Correct 277 ms 22476 KB Output is correct
62 Correct 94 ms 21860 KB Output is correct
63 Correct 287 ms 21964 KB Output is correct
64 Correct 259 ms 21944 KB Output is correct
65 Correct 273 ms 21948 KB Output is correct
66 Correct 0 ms 348 KB Output is correct
67 Correct 263 ms 22504 KB Output is correct
68 Correct 270 ms 22348 KB Output is correct
69 Correct 296 ms 22556 KB Output is correct
70 Correct 276 ms 22216 KB Output is correct
71 Correct 275 ms 22372 KB Output is correct
72 Correct 272 ms 22232 KB Output is correct
73 Correct 285 ms 22732 KB Output is correct
74 Correct 298 ms 22960 KB Output is correct
75 Correct 273 ms 22688 KB Output is correct
76 Correct 309 ms 22728 KB Output is correct
77 Correct 223 ms 22732 KB Output is correct
78 Correct 0 ms 600 KB Output is correct
79 Correct 1 ms 424 KB Output is correct
80 Correct 2 ms 604 KB Output is correct
81 Correct 1 ms 604 KB Output is correct
82 Correct 2 ms 604 KB Output is correct
83 Correct 1 ms 604 KB Output is correct
84 Correct 1 ms 604 KB Output is correct
85 Correct 1 ms 604 KB Output is correct
86 Correct 167 ms 1908 KB Output is correct
87 Correct 160 ms 1856 KB Output is correct
88 Correct 160 ms 2132 KB Output is correct
89 Correct 161 ms 2364 KB Output is correct
90 Correct 160 ms 1908 KB Output is correct
91 Correct 154 ms 1912 KB Output is correct
92 Correct 158 ms 1792 KB Output is correct
93 Correct 101 ms 21756 KB Output is correct
94 Correct 84 ms 21876 KB Output is correct
95 Correct 101 ms 21708 KB Output is correct
96 Correct 101 ms 21712 KB Output is correct
97 Correct 93 ms 21708 KB Output is correct
98 Correct 104 ms 21712 KB Output is correct
99 Correct 56 ms 21708 KB Output is correct
100 Correct 283 ms 22616 KB Output is correct
101 Correct 279 ms 22276 KB Output is correct
102 Correct 268 ms 22472 KB Output is correct
103 Correct 264 ms 22040 KB Output is correct
104 Correct 256 ms 21852 KB Output is correct
105 Correct 274 ms 22064 KB Output is correct
106 Correct 256 ms 22268 KB Output is correct
107 Correct 291 ms 22360 KB Output is correct
108 Correct 269 ms 22476 KB Output is correct
109 Correct 263 ms 22640 KB Output is correct
110 Correct 270 ms 22400 KB Output is correct
111 Correct 268 ms 22220 KB Output is correct