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Submission #1086471

# Submission time Handle Problem Language Result Execution time Memory
1086471 2024-09-10T17:49:45 Z juicy Fancy Fence (CEOI20_fancyfence) C++17
100 / 100
 26 ms 3552 KB 
#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#endif

const int M = 1e9 + 7;

void add(int &x, int y) {
  if ((x += y) >= M) {
    x -= M;
  }
  if (x < 0) {
    x += M;
  } 
}

int C2(int x) {
  return (long long) x * (x + 1) / 2 % M;
}

int main() {
  ios::sync_with_stdio(false); cin.tie(nullptr);

  int n; cin >> n;
  vector<int> h(n), w(n);
  for (int &x : h) {
    cin >> x;
  }
  vector<int> st;
  int sum = 0, res = 0;
  for (int i = 0; i < n; ++i) {
    cin >> w[i];
    int x = 0;
    while (st.size() && h[st.back()] >= h[i]) {
      add(x, w[st.back()]);
      add(sum, (long long) -w[st.back()] * C2(h[st.back()]) % M);
      st.pop_back();
    }
    add(res, (long long) w[i] * x % M * C2(h[i]) % M);
    add(res, (long long) w[i] * sum % M);
    add(res, (long long) C2(w[i]) * C2(h[i]) % M);
    add(x, w[i]);
    w[i] = x;
    add(sum, (long long) w[i] * C2(h[i]) % M);
    st.push_back(i);
  } 
  cout << res; 
  return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 408 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 7 ms 1232 KB Output is correct
4 Correct 14 ms 2396 KB Output is correct
5 Correct 16 ms 2396 KB Output is correct
6 Correct 18 ms 2384 KB Output is correct

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 2 ms 732 KB Output is correct
3 Correct 9 ms 1628 KB Output is correct
4 Correct 18 ms 3160 KB Output is correct
5 Correct 17 ms 3152 KB Output is correct
6 Correct 0 ms 348 KB Output is correct

Subtask #5
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 2 ms 604 KB Output is correct
4 Correct 9 ms 1628 KB Output is correct
5 Correct 26 ms 3152 KB Output is correct
6 Correct 17 ms 3164 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 2 ms 604 KB Output is correct
9 Correct 10 ms 1884 KB Output is correct
10 Correct 17 ms 3396 KB Output is correct
11 Correct 18 ms 3552 KB Output is correct
12 Correct 0 ms 348 KB Output is correct

Subtask #6
18.0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 396 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 344 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 0 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 484 KB Output is correct
16 Correct 0 ms 348 KB Output is correct

Subtask #7
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 10 ms 1352 KB Output is correct
12 Correct 14 ms 2412 KB Output is correct
13 Correct 17 ms 2396 KB Output is correct
14 Correct 16 ms 2396 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 3 ms 604 KB Output is correct
17 Correct 9 ms 1628 KB Output is correct
18 Correct 18 ms 3028 KB Output is correct
19 Correct 17 ms 3152 KB Output is correct
20 Correct 0 ms 348 KB Output is correct
21 Correct 2 ms 604 KB Output is correct
22 Correct 10 ms 1884 KB Output is correct
23 Correct 17 ms 3532 KB Output is correct
24 Correct 18 ms 3552 KB Output is correct
25 Correct 0 ms 348 KB Output is correct
26 Correct 0 ms 348 KB Output is correct
27 Correct 0 ms 488 KB Output is correct
28 Correct 0 ms 348 KB Output is correct
29 Correct 1 ms 348 KB Output is correct
30 Correct 2 ms 604 KB Output is correct
31 Correct 3 ms 604 KB Output is correct
32 Correct 11 ms 1488 KB Output is correct
33 Correct 10 ms 1628 KB Output is correct
34 Correct 19 ms 2776 KB Output is correct
35 Correct 19 ms 2900 KB Output is correct
36 Correct 20 ms 3148 KB Output is correct
37 Correct 25 ms 3164 KB Output is correct
38 Correct 0 ms 348 KB Output is correct
39 Correct 22 ms 3148 KB Output is correct
40 Correct 19 ms 3152 KB Output is correct
41 Correct 19 ms 3164 KB Output is correct
42 Correct 18 ms 3308 KB Output is correct