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Submission #647389

# Submission time Handle Problem Language Result Execution time Memory
647389 2022-10-02T11:07:41 Z Pety Event Hopping (BOI22_events) C++14
100 / 100
 173 ms 11708 KB 
#include <bits/stdc++.h>
#define ll long long
 
using namespace std;
 
const int INF = 1e9;
const int MOD = 1e9 + 7;
 
int n, q, E[100002], dp[20][100002], ind[100002];
pair<int, int>p[100002];
int aint[400002], poz[400002];
 
void build (int nod, int st, int dr) {
  aint[nod] = INF;
  poz[nod] = st;
  if (st < dr) {
    build(2 * nod, st, (st + dr) / 2);
    build(2 * nod + 1, (st + dr) / 2 + 1, dr);
  }
}
 
void update (int nod, int st, int dr, int x, pair<int, int> val) {
  if (st == dr) {
    if (aint[nod] > val.first) {
      aint[nod] = val.first;
      poz[nod] = val.second;
    }
    return;
  }
  int mid = (st + dr) / 2;
  if (x <= mid)
    update(2 * nod, st, mid, x, val);
  else
    update(2 * nod + 1, mid + 1, dr, x, val);
  aint[nod] = min(aint[2 * nod], aint[2 * nod + 1]);
  if (aint[2 * nod] == aint[nod])
    poz[nod] = poz[2 * nod];
  else
    poz[nod] = poz[2 * nod + 1];
}
 
pair<int, int> query (int nod, int st, int dr, int a, int b) {
  if (a <= st && dr <= b) 
    return {aint[nod], poz[nod]};
  int mid = (st + dr) / 2;
  if (b <= mid)
    return query(2 * nod, st, mid, a, b);
  else if (a > mid)
    return query(2 * nod + 1, mid + 1, dr, a, b);
  else {
    auto p1 = query(2 * nod, st, mid, a, b);
    auto p2 = query(2 * nod + 1, mid + 1, dr, a, b);
    return min(p1, p2);
  }
}
 
bool cmp (int a, int b) {
  if (p[a].second == p[b].second)
    return p[a].first < p[b].first;
  return p[a].second < p[b].second;
}
 
int main () 
{
  ios_base::sync_with_stdio(false);
  cin.tie(0); cout.tie(0);
  cin >> n >> q;
  for (int i = 1; i <= n; i++) {
    cin >> p[i].first >> p[i].second;
    E[i] = p[i].second;
  }
  sort(E + 1, E + n + 1);
  int m = 0;
  for (int i = 1; i <= n; i++) {
    ind[i] = i;
    if (i == 1 || E[i] != E[i - 1])
      E[++m] = E[i];
  }
  sort(ind + 1, ind + n + 1, cmp);
  build(1, 1, n);
  for (int i = 1; i <= n; i++) {
    p[ind[i]].second = lower_bound(E + 1, E + m + 1, p[ind[i]].second) - E;
    p[ind[i]].first = lower_bound(E + 1, E + m + 1, p[ind[i]].first) - E;
    update(1, 1, n, p[ind[i]].second, {p[ind[i]].first, ind[i]});
    dp[0][ind[i]] = query(1, 1, n, p[ind[i]].first, p[ind[i]].second).second; 
  }
 
  int lim = 0;
  while ((1 << lim) <= n)
    lim++;
  lim--;
  for (int i = 1; (1 << i) <= n; i++) 
    for (int j = 1; j <= n; j++)
      dp[i][j] = dp[i - 1][dp[i - 1][j]];
  while (q--) {
    int s, e;
    cin >> s >> e;
    if (p[e].second < p[s].second) {
      cout << "impossible\n";
      continue;
    }
    if (p[s].second >= p[e].first) {
      cout<< (s != e) << "\n";
      continue;
    }
    
    int ans = 0;
    for (int i = lim; i >= 0; i--) {
      if (p[s].second < p[dp[i][e]].first) {
        e = dp[i][e];
        ans += (1 << i);
      }
    }
    e = dp[0][e];
    ans++;
    if (p[e].first <= p[s].second) 
      cout << ans + (s != e) << "\n";
    else
      cout << "impossible\n";
  }
  
  return 0;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 93 ms 11084 KB Output is correct
3 Correct 107 ms 11156 KB Output is correct
4 Correct 173 ms 11180 KB Output is correct
5 Correct 118 ms 11340 KB Output is correct
6 Correct 127 ms 11240 KB Output is correct
7 Correct 141 ms 11280 KB Output is correct
8 Correct 120 ms 11632 KB Output is correct
9 Correct 126 ms 11640 KB Output is correct
10 Correct 129 ms 11548 KB Output is correct
11 Correct 126 ms 11596 KB Output is correct
12 Correct 72 ms 11660 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 464 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 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 464 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 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 0 ms 340 KB Output is correct
11 Correct 0 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 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 34 ms 1300 KB Output is correct
20 Correct 35 ms 1364 KB Output is correct
21 Correct 31 ms 1528 KB Output is correct
22 Correct 27 ms 1596 KB Output is correct
23 Correct 26 ms 1524 KB Output is correct
24 Correct 23 ms 1416 KB Output is correct
25 Correct 31 ms 1212 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 464 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 468 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 0 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 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 79 ms 10576 KB Output is correct
20 Correct 73 ms 10564 KB Output is correct
21 Correct 87 ms 10596 KB Output is correct
22 Correct 73 ms 10580 KB Output is correct
23 Correct 74 ms 10592 KB Output is correct
24 Correct 81 ms 10476 KB Output is correct
25 Correct 44 ms 10564 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 104 ms 11200 KB Output is correct
2 Correct 120 ms 11172 KB Output is correct
3 Correct 168 ms 11120 KB Output is correct
4 Correct 120 ms 11708 KB Output is correct
5 Correct 128 ms 11508 KB Output is correct
6 Correct 129 ms 11248 KB Output is correct
7 Correct 125 ms 11304 KB Output is correct
8 Correct 119 ms 11372 KB Output is correct
9 Correct 72 ms 10548 KB Output is correct
10 Correct 111 ms 10964 KB Output is correct
11 Correct 129 ms 10692 KB Output is correct
12 Correct 122 ms 10960 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 93 ms 11084 KB Output is correct
3 Correct 107 ms 11156 KB Output is correct
4 Correct 173 ms 11180 KB Output is correct
5 Correct 118 ms 11340 KB Output is correct
6 Correct 127 ms 11240 KB Output is correct
7 Correct 141 ms 11280 KB Output is correct
8 Correct 120 ms 11632 KB Output is correct
9 Correct 126 ms 11640 KB Output is correct
10 Correct 129 ms 11548 KB Output is correct
11 Correct 126 ms 11596 KB Output is correct
12 Correct 72 ms 11660 KB Output is correct
13 Correct 1 ms 464 KB Output is correct
14 Correct 0 ms 340 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 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 0 ms 340 KB Output is correct
23 Correct 0 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 468 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 34 ms 1300 KB Output is correct
32 Correct 35 ms 1364 KB Output is correct
33 Correct 31 ms 1528 KB Output is correct
34 Correct 27 ms 1596 KB Output is correct
35 Correct 26 ms 1524 KB Output is correct
36 Correct 23 ms 1416 KB Output is correct
37 Correct 31 ms 1212 KB Output is correct
38 Correct 1 ms 340 KB Output is correct
39 Correct 0 ms 340 KB Output is correct
40 Correct 1 ms 468 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 79 ms 10576 KB Output is correct
48 Correct 73 ms 10564 KB Output is correct
49 Correct 87 ms 10596 KB Output is correct
50 Correct 73 ms 10580 KB Output is correct
51 Correct 74 ms 10592 KB Output is correct
52 Correct 81 ms 10476 KB Output is correct
53 Correct 44 ms 10564 KB Output is correct
54 Correct 104 ms 11200 KB Output is correct
55 Correct 120 ms 11172 KB Output is correct
56 Correct 168 ms 11120 KB Output is correct
57 Correct 120 ms 11708 KB Output is correct
58 Correct 128 ms 11508 KB Output is correct
59 Correct 129 ms 11248 KB Output is correct
60 Correct 125 ms 11304 KB Output is correct
61 Correct 119 ms 11372 KB Output is correct
62 Correct 72 ms 10548 KB Output is correct
63 Correct 111 ms 10964 KB Output is correct
64 Correct 129 ms 10692 KB Output is correct
65 Correct 122 ms 10960 KB Output is correct
66 Correct 0 ms 340 KB Output is correct
67 Correct 110 ms 11120 KB Output is correct
68 Correct 113 ms 11104 KB Output is correct
69 Correct 150 ms 11104 KB Output is correct
70 Correct 117 ms 11152 KB Output is correct
71 Correct 113 ms 11224 KB Output is correct
72 Correct 124 ms 11244 KB Output is correct
73 Correct 124 ms 11596 KB Output is correct
74 Correct 124 ms 11572 KB Output is correct
75 Correct 116 ms 11448 KB Output is correct
76 Correct 115 ms 11504 KB Output is correct
77 Correct 81 ms 11676 KB Output is correct
78 Correct 0 ms 340 KB Output is correct
79 Correct 1 ms 468 KB Output is correct
80 Correct 2 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 468 KB Output is correct
85 Correct 1 ms 468 KB Output is correct
86 Correct 31 ms 1304 KB Output is correct
87 Correct 31 ms 1272 KB Output is correct
88 Correct 33 ms 1612 KB Output is correct
89 Correct 27 ms 1660 KB Output is correct
90 Correct 25 ms 1444 KB Output is correct
91 Correct 27 ms 1528 KB Output is correct
92 Correct 29 ms 1108 KB Output is correct
93 Correct 70 ms 10520 KB Output is correct
94 Correct 69 ms 10592 KB Output is correct
95 Correct 81 ms 10484 KB Output is correct
96 Correct 72 ms 10580 KB Output is correct
97 Correct 72 ms 10484 KB Output is correct
98 Correct 81 ms 10572 KB Output is correct
99 Correct 45 ms 10572 KB Output is correct
100 Correct 139 ms 11272 KB Output is correct
101 Correct 124 ms 11244 KB Output is correct
102 Correct 119 ms 11484 KB Output is correct
103 Correct 119 ms 10988 KB Output is correct
104 Correct 116 ms 10732 KB Output is correct
105 Correct 117 ms 10960 KB Output is correct
106 Correct 120 ms 11264 KB Output is correct
107 Correct 124 ms 11368 KB Output is correct
108 Correct 132 ms 11376 KB Output is correct
109 Correct 119 ms 11340 KB Output is correct
110 Correct 134 ms 11296 KB Output is correct
111 Correct 154 ms 11244 KB Output is correct