oj.uz

Submission #659847

# Submission time Handle Problem Language Result Execution time Memory
659847 2022-11-19T12:25:07 Z 600Mihnea Event Hopping (BOI22_events) C++17
100 / 100
 916 ms 63764 KB 
bool home = 0;
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int N = (int) 1e5 + 7;
int n;
int q;

struct T {
  int l;
  int r;
  int init;
};

bool operator < (T a, T b) {
  if (a.r != b.r) {
    return a.r < b.r;
  } else {
    return a.l < b.l;
  }
}

T v[N];
int dp[N];
int nxt[N];
int ant[N];
int inv[N];
int low[N];
int high[N];

int cnt_rs_under(int limit) {
  int low = 1, high = n, cnt = 0;
  while (low <= high) {
    int mid = (low + high) / 2;
    if (v[mid].r <= limit) {
      cnt = mid;
      low = mid + 1;
    } else {
      high = mid - 1;
    }
  }
  return cnt;
}

pair<int, int> join(pair<int, int> a, pair<int, int> b) {
  return {min(a.first, b.first), max(a.second, b.second)};
}

const int K = 20;
const int INF = (int) 1e9 + 7;
pair<int, int> after[K][N];
pair<int, int> tree[K][4 * N];

void build(int v, int tl, int tr, int k) {
  if (tl == tr) {
    tree[k][v] = after[k][tl];
  } else {
    int tm = (tl + tr) / 2;
    build(2 * v, tl, tm, k);
    build(2 * v + 1, tm + 1, tr, k);
    tree[k][v] = join(tree[k][2 * v], tree[k][2 * v + 1]);
  }
}

pair<int, int> get(int v, int tl, int tr, int l, int r, int k) {
  if (tr < l || r < tl) {
    return make_pair(INF, -INF);
  }
  if (l <= tl && tr <= r) {
    return tree[k][v];
  }
  int tm = (tl + tr) / 2;
  return join(get(2 * v, tl, tm, l, r, k), get(2 * v + 1, tm + 1, tr, l, r, k));
}

pair<int, int> get(int l, int r, int k) {
  return get(1, 1, n, l, r, k);
}

void build(int k) {
  build(1, 1, n, k);
}

pair<int, int> do_2_pw_k_steps(pair<int, int> cur, int k) {
  int L = cur.first, R = cur.second;
  assert(1 <= L && L <= R && R <= n);
  return get(L, R, k);
}

int main() {
  if (!home) {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  } else {
    freopen("input.txt", "r", stdin);
  }

  cin >> n >> q;
  for (int i = 1; i <= n; i++) {
    cin >> v[i].l >> v[i].r;
    v[i].init = i;
  }
  sort(v + 1, v + n + 1);
  for (int i = 1; i <= n; i++) {
    int x = cnt_rs_under(v[i].l - 1) + 1;
    int y = cnt_rs_under(v[i].r);
    low[i] = x;
    high[i] = y;
    after[0][i] = {low[i], high[i]};
  }
  build(0);
  for (int k = 1; k < K; k++) {
    for (int i = 1; i <= n; i++) {
      after[k][i] = do_2_pw_k_steps(after[k - 1][i], k - 1);
    }
    build(k);
  }
  for (int i = 1; i <= n; i++) {
    inv[v[i].init] = i;
  }

  for (int iq = 1; iq <= q; iq++) {
    int ff, ss;
    cin >> ff >> ss;
    ff = inv[ff];
    ss = inv[ss];
    int cost = 1;
    pair<int, int> cur = {ss, ss};
    {
      pair<int, int> nxt_cur = do_2_pw_k_steps(cur, K - 1);
      if (!(nxt_cur.first <= ff && ff <= nxt_cur.second)) {
        cout << "impossible\n";
        continue;
      }
    }
    if (ff == ss) {
      cout << "0\n";
      continue;
    }
    for (int k = K - 1; k >= 0; k--) {
      pair<int, int> nxt_cur = do_2_pw_k_steps(cur, k);
      if (!(nxt_cur.first <= ff && ff <= nxt_cur.second)) {
        cost += (1 << k);
        cur = nxt_cur;
      }
    }
    cout << cost << "\n";
  }

  return 0;
}
/**

**/

Compilation message

events.cpp: In function 'int main()':
events.cpp:96:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   96 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 648 ms 60936 KB Output is correct
3 Correct 833 ms 63180 KB Output is correct
4 Correct 916 ms 63116 KB Output is correct
5 Correct 801 ms 63140 KB Output is correct
6 Correct 794 ms 63204 KB Output is correct
7 Correct 761 ms 63424 KB Output is correct
8 Correct 338 ms 63564 KB Output is correct
9 Correct 347 ms 63552 KB Output is correct
10 Correct 658 ms 63484 KB Output is correct
11 Correct 544 ms 63648 KB Output is correct
12 Correct 338 ms 62880 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 3 ms 1108 KB Output is correct
4 Correct 3 ms 980 KB Output is correct
5 Correct 3 ms 1076 KB Output is correct
6 Correct 3 ms 1108 KB Output is correct
7 Correct 3 ms 1108 KB Output is correct
8 Correct 3 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 3 ms 1108 KB Output is correct
4 Correct 3 ms 980 KB Output is correct
5 Correct 3 ms 1076 KB Output is correct
6 Correct 3 ms 1108 KB Output is correct
7 Correct 3 ms 1108 KB Output is correct
8 Correct 3 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 1 ms 596 KB Output is correct
11 Correct 0 ms 596 KB Output is correct
12 Correct 3 ms 980 KB Output is correct
13 Correct 3 ms 1108 KB Output is correct
14 Correct 3 ms 980 KB Output is correct
15 Correct 3 ms 1108 KB Output is correct
16 Correct 3 ms 980 KB Output is correct
17 Correct 3 ms 1108 KB Output is correct
18 Correct 1 ms 1108 KB Output is correct
19 Correct 287 ms 5372 KB Output is correct
20 Correct 316 ms 5488 KB Output is correct
21 Correct 200 ms 5728 KB Output is correct
22 Correct 110 ms 5836 KB Output is correct
23 Correct 132 ms 5632 KB Output is correct
24 Correct 133 ms 5676 KB Output is correct
25 Correct 253 ms 5448 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 596 KB Output is correct
2 Correct 1 ms 596 KB Output is correct
3 Correct 3 ms 1108 KB Output is correct
4 Correct 3 ms 980 KB Output is correct
5 Correct 3 ms 1076 KB Output is correct
6 Correct 3 ms 1108 KB Output is correct
7 Correct 3 ms 1108 KB Output is correct
8 Correct 3 ms 1108 KB Output is correct
9 Correct 1 ms 1108 KB Output is correct
10 Correct 0 ms 596 KB Output is correct
11 Correct 1 ms 596 KB Output is correct
12 Correct 3 ms 980 KB Output is correct
13 Correct 3 ms 980 KB Output is correct
14 Correct 3 ms 1108 KB Output is correct
15 Correct 3 ms 1108 KB Output is correct
16 Correct 3 ms 1108 KB Output is correct
17 Correct 3 ms 1108 KB Output is correct
18 Correct 1 ms 980 KB Output is correct
19 Correct 390 ms 59436 KB Output is correct
20 Correct 383 ms 60656 KB Output is correct
21 Correct 337 ms 61288 KB Output is correct
22 Correct 380 ms 61436 KB Output is correct
23 Correct 307 ms 61356 KB Output is correct
24 Correct 370 ms 61476 KB Output is correct
25 Correct 73 ms 60700 KB Output is correct

Subtask #5
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 639 ms 61000 KB Output is correct
2 Correct 846 ms 63188 KB Output is correct
3 Correct 903 ms 63184 KB Output is correct
4 Correct 340 ms 63668 KB Output is correct
5 Correct 610 ms 63556 KB Output is correct
6 Correct 770 ms 63308 KB Output is correct
7 Correct 769 ms 63396 KB Output is correct
8 Correct 665 ms 63436 KB Output is correct
9 Correct 323 ms 61384 KB Output is correct
10 Correct 707 ms 62856 KB Output is correct
11 Correct 564 ms 62656 KB Output is correct
12 Correct 727 ms 62924 KB Output is correct

Subtask #6
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 596 KB Output is correct
2 Correct 648 ms 60936 KB Output is correct
3 Correct 833 ms 63180 KB Output is correct
4 Correct 916 ms 63116 KB Output is correct
5 Correct 801 ms 63140 KB Output is correct
6 Correct 794 ms 63204 KB Output is correct
7 Correct 761 ms 63424 KB Output is correct
8 Correct 338 ms 63564 KB Output is correct
9 Correct 347 ms 63552 KB Output is correct
10 Correct 658 ms 63484 KB Output is correct
11 Correct 544 ms 63648 KB Output is correct
12 Correct 338 ms 62880 KB Output is correct
13 Correct 0 ms 596 KB Output is correct
14 Correct 1 ms 596 KB Output is correct
15 Correct 3 ms 1108 KB Output is correct
16 Correct 3 ms 980 KB Output is correct
17 Correct 3 ms 1076 KB Output is correct
18 Correct 3 ms 1108 KB Output is correct
19 Correct 3 ms 1108 KB Output is correct
20 Correct 3 ms 1108 KB Output is correct
21 Correct 1 ms 1108 KB Output is correct
22 Correct 1 ms 596 KB Output is correct
23 Correct 0 ms 596 KB Output is correct
24 Correct 3 ms 980 KB Output is correct
25 Correct 3 ms 1108 KB Output is correct
26 Correct 3 ms 980 KB Output is correct
27 Correct 3 ms 1108 KB Output is correct
28 Correct 3 ms 980 KB Output is correct
29 Correct 3 ms 1108 KB Output is correct
30 Correct 1 ms 1108 KB Output is correct
31 Correct 287 ms 5372 KB Output is correct
32 Correct 316 ms 5488 KB Output is correct
33 Correct 200 ms 5728 KB Output is correct
34 Correct 110 ms 5836 KB Output is correct
35 Correct 132 ms 5632 KB Output is correct
36 Correct 133 ms 5676 KB Output is correct
37 Correct 253 ms 5448 KB Output is correct
38 Correct 0 ms 596 KB Output is correct
39 Correct 1 ms 596 KB Output is correct
40 Correct 3 ms 980 KB Output is correct
41 Correct 3 ms 980 KB Output is correct
42 Correct 3 ms 1108 KB Output is correct
43 Correct 3 ms 1108 KB Output is correct
44 Correct 3 ms 1108 KB Output is correct
45 Correct 3 ms 1108 KB Output is correct
46 Correct 1 ms 980 KB Output is correct
47 Correct 390 ms 59436 KB Output is correct
48 Correct 383 ms 60656 KB Output is correct
49 Correct 337 ms 61288 KB Output is correct
50 Correct 380 ms 61436 KB Output is correct
51 Correct 307 ms 61356 KB Output is correct
52 Correct 370 ms 61476 KB Output is correct
53 Correct 73 ms 60700 KB Output is correct
54 Correct 639 ms 61000 KB Output is correct
55 Correct 846 ms 63188 KB Output is correct
56 Correct 903 ms 63184 KB Output is correct
57 Correct 340 ms 63668 KB Output is correct
58 Correct 610 ms 63556 KB Output is correct
59 Correct 770 ms 63308 KB Output is correct
60 Correct 769 ms 63396 KB Output is correct
61 Correct 665 ms 63436 KB Output is correct
62 Correct 323 ms 61384 KB Output is correct
63 Correct 707 ms 62856 KB Output is correct
64 Correct 564 ms 62656 KB Output is correct
65 Correct 727 ms 62924 KB Output is correct
66 Correct 1 ms 596 KB Output is correct
67 Correct 700 ms 63244 KB Output is correct
68 Correct 864 ms 63352 KB Output is correct
69 Correct 904 ms 63180 KB Output is correct
70 Correct 805 ms 63220 KB Output is correct
71 Correct 790 ms 63340 KB Output is correct
72 Correct 771 ms 63244 KB Output is correct
73 Correct 337 ms 63764 KB Output is correct
74 Correct 342 ms 63600 KB Output is correct
75 Correct 604 ms 63504 KB Output is correct
76 Correct 536 ms 63524 KB Output is correct
77 Correct 337 ms 62816 KB Output is correct
78 Correct 1 ms 596 KB Output is correct
79 Correct 4 ms 1108 KB Output is correct
80 Correct 4 ms 1108 KB Output is correct
81 Correct 3 ms 1112 KB Output is correct
82 Correct 3 ms 1108 KB Output is correct
83 Correct 4 ms 1108 KB Output is correct
84 Correct 3 ms 1108 KB Output is correct
85 Correct 2 ms 1108 KB Output is correct
86 Correct 298 ms 5440 KB Output is correct
87 Correct 339 ms 5468 KB Output is correct
88 Correct 208 ms 5700 KB Output is correct
89 Correct 102 ms 5860 KB Output is correct
90 Correct 131 ms 5708 KB Output is correct
91 Correct 144 ms 5736 KB Output is correct
92 Correct 256 ms 5364 KB Output is correct
93 Correct 391 ms 61404 KB Output is correct
94 Correct 384 ms 60584 KB Output is correct
95 Correct 341 ms 61328 KB Output is correct
96 Correct 373 ms 61332 KB Output is correct
97 Correct 308 ms 61308 KB Output is correct
98 Correct 381 ms 61356 KB Output is correct
99 Correct 70 ms 60740 KB Output is correct
100 Correct 757 ms 63420 KB Output is correct
101 Correct 737 ms 63228 KB Output is correct
102 Correct 652 ms 63436 KB Output is correct
103 Correct 733 ms 62900 KB Output is correct
104 Correct 567 ms 62752 KB Output is correct
105 Correct 705 ms 62984 KB Output is correct
106 Correct 673 ms 62528 KB Output is correct
107 Correct 825 ms 62620 KB Output is correct
108 Correct 576 ms 63292 KB Output is correct
109 Correct 551 ms 63404 KB Output is correct
110 Correct 611 ms 63228 KB Output is correct
111 Correct 581 ms 63180 KB Output is correct