oj.uz

Submission #1113303

# Submission time Handle Problem Language Result Execution time Memory
1113303 2024-11-16T10:22:24 Z flashmt Event Hopping (BOI22_events) C++17
100 / 100
 236 ms 52736 KB 
#include <bits/stdc++.h>
using namespace std;
 
template<typename T>
struct SparseTable
{
  int n;
  vector<vector<T>> mat;
 
  SparseTable(const vector<T>& a)
  {
    n = int(a.size());
    int maxLog = 32 - __builtin_clz(n);
    mat.resize(maxLog);
    mat[0] = a;
    for (int j = 1; j < maxLog; j++)
    {
      mat[j].resize(n - (1 << j) + 1);
      for (int i = 0; i <= n - (1 << j); i++)
        mat[j][i] = min(mat[j - 1][i], mat[j - 1][i + (1 << (j - 1))]);
    }
  }
 
  T get(int from, int to)
  {
    assert(0 <= from && from <= to && to <= n - 1);
    int lg = 31 - __builtin_clz(to - from + 1);
    return min(mat[lg][from], mat[lg][to - (1 << lg) + 1]);
  }
};
 
const int oo = 27081993;
const int LG = 17;
 
int main()
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, q;
  cin >> n >> q;
  vector<pair<int, int>> a;
  map<int, int> values;
  for (int i = 0; i < n; i++)
  {
    int l, r;
    cin >> l >> r;
    a.push_back({l, r});
    values[l] = values[r] = 0;
  }
 
  int valueCnt = 0;
  for (auto [k, _] : values)
    values[k] = valueCnt++;
 
  vector<pair<int, int>> minL(valueCnt, make_pair(oo, -1));
  for (int i = 0; i < n; i++)
  {
    auto [l, r] = a[i];
    l = values[l];
    r = values[r];
    a[i] = {l, r};
    minL[r] = min(minL[r], make_pair(l, i));
  }
 
  SparseTable<pair<int, int>> st(minL);
  vector<vector<int>> prev(n, vector<int>(LG, -1));
  for (int i = 0; i < n; i++)
  {
    auto [l, id] = st.get(a[i].first, a[i].second);
    if (l < a[i].first)
      prev[i][0] = id;
  }
  for (int j = 0; j + 1 < LG; j++)
    for (int i = 0; i < n; i++)
      if (prev[i][j] >= 0)
        prev[i][j + 1] = prev[prev[i][j]][j];
 
  while (q--)
  {
    int s, t;
    cin >> s >> t;
    s--; t--;
    if (s == t) cout << "0\n";
    else if (a[t].first <= a[s].second && a[s].second <= a[t].second) cout << "1\n";
    else if (a[s].second > a[t].second) cout << "impossible\n";
    else
    {
      int ans = 1;
      for (int i = LG - 1; i >= 0; i--)
        if (prev[t][i] >= 0 && a[prev[t][i]].first > a[s].second)
        {
          ans += 1 << i;
          t = prev[t][i];
        }
 
      if (prev[t][0] >= 0 && a[prev[t][0]].first <= a[s].second) ans++;
      else ans = -1;
 
      if (ans < 0) cout << "impossible\n";
      else cout << ans << '\n';
    }
  }
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 149 ms 32884 KB Output is correct
3 Correct 177 ms 32688 KB Output is correct
4 Correct 179 ms 32700 KB Output is correct
5 Correct 188 ms 34756 KB Output is correct
6 Correct 184 ms 36540 KB Output is correct
7 Correct 180 ms 37052 KB Output is correct
8 Correct 171 ms 52668 KB Output is correct
9 Correct 159 ms 52668 KB Output is correct
10 Correct 159 ms 33164 KB Output is correct
11 Correct 161 ms 40824 KB Output is correct
12 Correct 89 ms 32444 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 548 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 592 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 2 ms 848 KB Output is correct
8 Correct 2 ms 848 KB Output is correct
9 Correct 1 ms 336 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 548 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 592 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 2 ms 848 KB Output is correct
8 Correct 2 ms 848 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 592 KB Output is correct
13 Correct 1 ms 756 KB Output is correct
14 Correct 2 ms 592 KB Output is correct
15 Correct 2 ms 592 KB Output is correct
16 Correct 2 ms 848 KB Output is correct
17 Correct 2 ms 848 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 26 ms 3264 KB Output is correct
20 Correct 28 ms 3152 KB Output is correct
21 Correct 29 ms 3240 KB Output is correct
22 Correct 19 ms 3408 KB Output is correct
23 Correct 20 ms 4168 KB Output is correct
24 Correct 19 ms 3992 KB Output is correct
25 Correct 28 ms 3408 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 548 KB Output is correct
3 Correct 2 ms 592 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 592 KB Output is correct
6 Correct 2 ms 592 KB Output is correct
7 Correct 2 ms 848 KB Output is correct
8 Correct 2 ms 848 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 2 ms 592 KB Output is correct
13 Correct 2 ms 592 KB Output is correct
14 Correct 2 ms 592 KB Output is correct
15 Correct 2 ms 592 KB Output is correct
16 Correct 2 ms 848 KB Output is correct
17 Correct 2 ms 848 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 122 ms 31044 KB Output is correct
20 Correct 123 ms 30268 KB Output is correct
21 Correct 137 ms 30908 KB Output is correct
22 Correct 149 ms 38076 KB Output is correct
23 Correct 172 ms 50336 KB Output is correct
24 Correct 198 ms 50364 KB Output is correct
25 Correct 28 ms 12492 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 145 ms 29628 KB Output is correct
2 Correct 169 ms 29628 KB Output is correct
3 Correct 173 ms 29636 KB Output is correct
4 Correct 178 ms 49596 KB Output is correct
5 Correct 191 ms 33224 KB Output is correct
6 Correct 219 ms 52156 KB Output is correct
7 Correct 227 ms 52368 KB Output is correct
8 Correct 212 ms 50412 KB Output is correct
9 Correct 161 ms 50364 KB Output is correct
10 Correct 236 ms 51900 KB Output is correct
11 Correct 209 ms 51652 KB Output is correct
12 Correct 210 ms 52004 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 149 ms 32884 KB Output is correct
3 Correct 177 ms 32688 KB Output is correct
4 Correct 179 ms 32700 KB Output is correct
5 Correct 188 ms 34756 KB Output is correct
6 Correct 184 ms 36540 KB Output is correct
7 Correct 180 ms 37052 KB Output is correct
8 Correct 171 ms 52668 KB Output is correct
9 Correct 159 ms 52668 KB Output is correct
10 Correct 159 ms 33164 KB Output is correct
11 Correct 161 ms 40824 KB Output is correct
12 Correct 89 ms 32444 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 548 KB Output is correct
15 Correct 2 ms 592 KB Output is correct
16 Correct 2 ms 760 KB Output is correct
17 Correct 2 ms 592 KB Output is correct
18 Correct 2 ms 592 KB Output is correct
19 Correct 2 ms 848 KB Output is correct
20 Correct 2 ms 848 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 592 KB Output is correct
25 Correct 1 ms 756 KB Output is correct
26 Correct 2 ms 592 KB Output is correct
27 Correct 2 ms 592 KB Output is correct
28 Correct 2 ms 848 KB Output is correct
29 Correct 2 ms 848 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 26 ms 3264 KB Output is correct
32 Correct 28 ms 3152 KB Output is correct
33 Correct 29 ms 3240 KB Output is correct
34 Correct 19 ms 3408 KB Output is correct
35 Correct 20 ms 4168 KB Output is correct
36 Correct 19 ms 3992 KB Output is correct
37 Correct 28 ms 3408 KB Output is correct
38 Correct 1 ms 336 KB Output is correct
39 Correct 1 ms 336 KB Output is correct
40 Correct 2 ms 592 KB Output is correct
41 Correct 2 ms 592 KB Output is correct
42 Correct 2 ms 592 KB Output is correct
43 Correct 2 ms 592 KB Output is correct
44 Correct 2 ms 848 KB Output is correct
45 Correct 2 ms 848 KB Output is correct
46 Correct 2 ms 592 KB Output is correct
47 Correct 122 ms 31044 KB Output is correct
48 Correct 123 ms 30268 KB Output is correct
49 Correct 137 ms 30908 KB Output is correct
50 Correct 149 ms 38076 KB Output is correct
51 Correct 172 ms 50336 KB Output is correct
52 Correct 198 ms 50364 KB Output is correct
53 Correct 28 ms 12492 KB Output is correct
54 Correct 145 ms 29628 KB Output is correct
55 Correct 169 ms 29628 KB Output is correct
56 Correct 173 ms 29636 KB Output is correct
57 Correct 178 ms 49596 KB Output is correct
58 Correct 191 ms 33224 KB Output is correct
59 Correct 219 ms 52156 KB Output is correct
60 Correct 227 ms 52368 KB Output is correct
61 Correct 212 ms 50412 KB Output is correct
62 Correct 161 ms 50364 KB Output is correct
63 Correct 236 ms 51900 KB Output is correct
64 Correct 209 ms 51652 KB Output is correct
65 Correct 210 ms 52004 KB Output is correct
66 Correct 1 ms 336 KB Output is correct
67 Correct 136 ms 32792 KB Output is correct
68 Correct 149 ms 32640 KB Output is correct
69 Correct 164 ms 32188 KB Output is correct
70 Correct 175 ms 34748 KB Output is correct
71 Correct 179 ms 35516 KB Output is correct
72 Correct 163 ms 37052 KB Output is correct
73 Correct 165 ms 52736 KB Output is correct
74 Correct 163 ms 52668 KB Output is correct
75 Correct 184 ms 33212 KB Output is correct
76 Correct 165 ms 40644 KB Output is correct
77 Correct 95 ms 32600 KB Output is correct
78 Correct 1 ms 336 KB Output is correct
79 Correct 2 ms 592 KB Output is correct
80 Correct 2 ms 524 KB Output is correct
81 Correct 2 ms 760 KB Output is correct
82 Correct 2 ms 592 KB Output is correct
83 Correct 2 ms 728 KB Output is correct
84 Correct 2 ms 848 KB Output is correct
85 Correct 2 ms 592 KB Output is correct
86 Correct 28 ms 3400 KB Output is correct
87 Correct 30 ms 3156 KB Output is correct
88 Correct 31 ms 3480 KB Output is correct
89 Correct 21 ms 3400 KB Output is correct
90 Correct 22 ms 4176 KB Output is correct
91 Correct 29 ms 4176 KB Output is correct
92 Correct 26 ms 3664 KB Output is correct
93 Correct 125 ms 31164 KB Output is correct
94 Correct 119 ms 30140 KB Output is correct
95 Correct 131 ms 30844 KB Output is correct
96 Correct 145 ms 38088 KB Output is correct
97 Correct 168 ms 50364 KB Output is correct
98 Correct 199 ms 50392 KB Output is correct
99 Correct 26 ms 12484 KB Output is correct
100 Correct 209 ms 52156 KB Output is correct
101 Correct 220 ms 52156 KB Output is correct
102 Correct 230 ms 52488 KB Output is correct
103 Correct 218 ms 51900 KB Output is correct
104 Correct 225 ms 51644 KB Output is correct
105 Correct 227 ms 51900 KB Output is correct
106 Correct 148 ms 27580 KB Output is correct
107 Correct 188 ms 32064 KB Output is correct
108 Correct 139 ms 32980 KB Output is correct
109 Correct 136 ms 32956 KB Output is correct
110 Correct 195 ms 52156 KB Output is correct
111 Correct 196 ms 52160 KB Output is correct