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Submission #968884

# Submission time Handle Problem Language Result Execution time Memory
968884 2024-04-24T08:36:51 Z nguyentunglam Radio Towers (IOI22_towers) C++17
23 / 100
 4000 ms 10820 KB 
#include "towers.h"
#include<bits/stdc++.h>
using namespace std;

const int N = 1e5 + 10;

int h[N], lg[N], sp[20][N], L[N], R[N];

int n;

int get(int l, int r) {
  if (l > r) return -1e9;
  int k = lg[r - l + 1];
  return max(sp[k][l], sp[k][r - (1 << k) + 1]);
}

void init(int N, std::vector<int> H) {
  n = N;
  for(int i = 0; i < n; i++) h[i] = H[i];
  stack<int> st;
  for(int i = 0; i < n; i++) {
    while (!st.empty() && h[st.top()] >= h[i]) st.pop();
    L[i] = st.empty() ? -1 : st.top();
    st.push(i);
  }
  while (!st.empty()) st.pop();
  for(int i = n - 1; i >= 0; i--) {
    while (!st.empty() && h[st.top()] >= h[i]) st.pop();
    R[i] = st.empty() ? n : st.top();
    st.push(i);
  }

  for(int i = 0; i < n; i++) sp[0][i] = h[i];
  for(int i = 2; i <= n; i++) lg[i] = lg[i / 2] + 1;
  for(int j = 1; j <= lg[n]; j++) for(int i = 0; i + (1 << j) - 1 < n; i++) {
    sp[j][i] = max(sp[j - 1][i], sp[j - 1][i + (1 << j - 1)]);
  }

}

int max_towers(int l, int r, int d) {
  int ans = 0;

  for(int i = l; i <= r; i++) {
    if (get(L[i] + 1, i - 1) - d < h[i]) continue;
    if (get(i + 1, R[i] - 1) - d < h[i]) continue;
    ans++;
  }

  int left = -1, right = -1, mn = l;

  for(int i = l; i <= r; i++) {
    if (L[i] < l) {
      if (R[i] > r || get(i + 1, R[i] - 1) - d >= h[i]) {
        left = i;
        break;
      }
    }
  }

  for(int i = r; i >= l; i--) {
    if (R[i] > r) {
      if (L[i] < l || get(L[i] + 1, i - 1) - d >= h[i]) {
        right = i;
        break;
      }
    }
  }

  for(int i = l + 1; i <= r; i++) if (h[i] < h[mn]) mn = i;

  if (left >= 0 && left != mn && get(L[left] + 1, left - 1) - d < h[left]) {
    ans++;
  }

//  cout << ans << endl;

  if (right >= 0 && right != mn && get(right + 1, R[right] - 1) - d < h[right]) {
    ans++;
  }

  if (get(L[mn] + 1, mn - 1) - d < h[mn] || get(mn + 1, R[mn] - 1) - d < h[mn]) ans++;

  return ans;
}

#ifdef ngu
int main() {
  freopen ("task.inp", "r", stdin);
  freopen ("task.out", "w", stdout);
  int N, Q;
  assert(2 == scanf("%d %d", &N, &Q));
  std::vector<int> H(N);
  for (int i = 0; i < N; ++i) {
    assert(1 == scanf("%d", &H[i]));
  }
  init(N, H);

  for (int i = 0; i < Q; ++i) {
    int L, R, D;
    assert(3 == scanf("%d %d %d", &L, &R, &D));
    printf("%d\n", max_towers(L, R, D));
  }
  return 0;
}
#endif // ngu

Compilation message

towers.cpp: In function 'void init(int, std::vector<int>)':
towers.cpp:36:56: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   36 |     sp[j][i] = max(sp[j - 1][i], sp[j - 1][i + (1 << j - 1)]);
      |                                                      ~~^~~

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 3464 ms 9900 KB Output is correct
2 Execution timed out 4032 ms 10544 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 2 ms 6488 KB Output is correct
4 Correct 1 ms 6488 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 1 ms 6488 KB Output is correct
7 Correct 2 ms 6488 KB Output is correct
8 Correct 1 ms 6488 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct
10 Correct 1 ms 6488 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 1 ms 2392 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6488 KB Output is correct
16 Correct 1 ms 6488 KB Output is correct
17 Correct 1 ms 6640 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6488 KB Output is correct
20 Correct 1 ms 6488 KB Output is correct
21 Correct 1 ms 6488 KB Output is correct
22 Correct 2 ms 6488 KB Output is correct
23 Correct 2 ms 6744 KB Output is correct
24 Correct 1 ms 6488 KB Output is correct
25 Correct 1 ms 6488 KB Output is correct
26 Correct 1 ms 6648 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6624 KB Output is correct
30 Correct 1 ms 6488 KB Output is correct
31 Correct 1 ms 6488 KB Output is correct
32 Correct 1 ms 6488 KB Output is correct
33 Correct 2 ms 6500 KB Output is correct
34 Correct 1 ms 6488 KB Output is correct
35 Correct 2 ms 6488 KB Output is correct

Subtask #3
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 2 ms 6488 KB Output is correct
4 Correct 1 ms 6488 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 1 ms 6488 KB Output is correct
7 Correct 2 ms 6488 KB Output is correct
8 Correct 1 ms 6488 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct
10 Correct 1 ms 6488 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 1 ms 2392 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6488 KB Output is correct
16 Correct 1 ms 6488 KB Output is correct
17 Correct 1 ms 6640 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6488 KB Output is correct
20 Correct 1 ms 6488 KB Output is correct
21 Correct 1 ms 6488 KB Output is correct
22 Correct 2 ms 6488 KB Output is correct
23 Correct 2 ms 6744 KB Output is correct
24 Correct 1 ms 6488 KB Output is correct
25 Correct 1 ms 6488 KB Output is correct
26 Correct 1 ms 6648 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6624 KB Output is correct
30 Correct 1 ms 6488 KB Output is correct
31 Correct 1 ms 6488 KB Output is correct
32 Correct 1 ms 6488 KB Output is correct
33 Correct 2 ms 6500 KB Output is correct
34 Correct 1 ms 6488 KB Output is correct
35 Correct 2 ms 6488 KB Output is correct
36 Correct 10 ms 9660 KB Output is correct
37 Correct 19 ms 10328 KB Output is correct
38 Correct 15 ms 10312 KB Output is correct
39 Correct 15 ms 10316 KB Output is correct
40 Correct 16 ms 10316 KB Output is correct
41 Correct 14 ms 10316 KB Output is correct
42 Correct 14 ms 10312 KB Output is correct
43 Correct 16 ms 10584 KB Output is correct
44 Correct 12 ms 10568 KB Output is correct
45 Correct 13 ms 10584 KB Output is correct
46 Correct 12 ms 10568 KB Output is correct
47 Correct 15 ms 10316 KB Output is correct
48 Correct 16 ms 10316 KB Output is correct
49 Correct 15 ms 10568 KB Output is correct
50 Correct 17 ms 10564 KB Output is correct
51 Correct 13 ms 10568 KB Output is correct
52 Correct 15 ms 10312 KB Output is correct
53 Correct 14 ms 10312 KB Output is correct
54 Correct 14 ms 10312 KB Output is correct
55 Correct 17 ms 10564 KB Output is correct
56 Correct 13 ms 10820 KB Output is correct
57 Correct 15 ms 10364 KB Output is correct
58 Correct 16 ms 10312 KB Output is correct
59 Correct 15 ms 10304 KB Output is correct
60 Correct 15 ms 10312 KB Output is correct
61 Correct 19 ms 10564 KB Output is correct
62 Correct 14 ms 10320 KB Output is correct
63 Correct 14 ms 10308 KB Output is correct
64 Correct 13 ms 10576 KB Output is correct
65 Correct 16 ms 10564 KB Output is correct
66 Correct 13 ms 10820 KB Output is correct
67 Correct 13 ms 10564 KB Output is correct

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Execution timed out 4091 ms 10312 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Execution timed out 4089 ms 6932 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4440 KB Output is correct
2 Correct 1 ms 6488 KB Output is correct
3 Correct 2 ms 6488 KB Output is correct
4 Correct 1 ms 6488 KB Output is correct
5 Correct 1 ms 6488 KB Output is correct
6 Correct 1 ms 6488 KB Output is correct
7 Correct 2 ms 6488 KB Output is correct
8 Correct 1 ms 6488 KB Output is correct
9 Correct 1 ms 6488 KB Output is correct
10 Correct 1 ms 6488 KB Output is correct
11 Correct 1 ms 6488 KB Output is correct
12 Correct 1 ms 2392 KB Output is correct
13 Correct 1 ms 6488 KB Output is correct
14 Correct 1 ms 6488 KB Output is correct
15 Correct 1 ms 6488 KB Output is correct
16 Correct 1 ms 6488 KB Output is correct
17 Correct 1 ms 6640 KB Output is correct
18 Correct 1 ms 6488 KB Output is correct
19 Correct 1 ms 6488 KB Output is correct
20 Correct 1 ms 6488 KB Output is correct
21 Correct 1 ms 6488 KB Output is correct
22 Correct 2 ms 6488 KB Output is correct
23 Correct 2 ms 6744 KB Output is correct
24 Correct 1 ms 6488 KB Output is correct
25 Correct 1 ms 6488 KB Output is correct
26 Correct 1 ms 6648 KB Output is correct
27 Correct 1 ms 6488 KB Output is correct
28 Correct 1 ms 6488 KB Output is correct
29 Correct 1 ms 6624 KB Output is correct
30 Correct 1 ms 6488 KB Output is correct
31 Correct 1 ms 6488 KB Output is correct
32 Correct 1 ms 6488 KB Output is correct
33 Correct 2 ms 6500 KB Output is correct
34 Correct 1 ms 6488 KB Output is correct
35 Correct 2 ms 6488 KB Output is correct
36 Correct 10 ms 9660 KB Output is correct
37 Correct 19 ms 10328 KB Output is correct
38 Correct 15 ms 10312 KB Output is correct
39 Correct 15 ms 10316 KB Output is correct
40 Correct 16 ms 10316 KB Output is correct
41 Correct 14 ms 10316 KB Output is correct
42 Correct 14 ms 10312 KB Output is correct
43 Correct 16 ms 10584 KB Output is correct
44 Correct 12 ms 10568 KB Output is correct
45 Correct 13 ms 10584 KB Output is correct
46 Correct 12 ms 10568 KB Output is correct
47 Correct 15 ms 10316 KB Output is correct
48 Correct 16 ms 10316 KB Output is correct
49 Correct 15 ms 10568 KB Output is correct
50 Correct 17 ms 10564 KB Output is correct
51 Correct 13 ms 10568 KB Output is correct
52 Correct 15 ms 10312 KB Output is correct
53 Correct 14 ms 10312 KB Output is correct
54 Correct 14 ms 10312 KB Output is correct
55 Correct 17 ms 10564 KB Output is correct
56 Correct 13 ms 10820 KB Output is correct
57 Correct 15 ms 10364 KB Output is correct
58 Correct 16 ms 10312 KB Output is correct
59 Correct 15 ms 10304 KB Output is correct
60 Correct 15 ms 10312 KB Output is correct
61 Correct 19 ms 10564 KB Output is correct
62 Correct 14 ms 10320 KB Output is correct
63 Correct 14 ms 10308 KB Output is correct
64 Correct 13 ms 10576 KB Output is correct
65 Correct 16 ms 10564 KB Output is correct
66 Correct 13 ms 10820 KB Output is correct
67 Correct 13 ms 10564 KB Output is correct
68 Execution timed out 4091 ms 10312 KB Time limit exceeded
69 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 3464 ms 9900 KB Output is correct
2 Execution timed out 4032 ms 10544 KB Time limit exceeded
3 Halted 0 ms 0 KB -