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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5.  
  6. int main() {
  7.     ios::sync_with_stdio(false);
  8.     cin.tie(nullptr);
  9.  
  10.     freopen("TRIPLE.INP", "r", stdin);
  11.     freopen("TRIPLE.OUT", "w", stdout);
  12.  
  13.     int n;
  14.     cin >> n;
  15.     vector<ll> a(n);
  16.     for (int i = 0; i < n; ++i) cin >> a[i];
  17.  
  18.     vector<ll> max_left(n, -1), max_right(n, -1);
  19.  
  20.     // Tính max_left
  21.     ll current_max = a[0];
  22.     for (int i = 1; i < n; ++i) {
  23.         max_left[i] = current_max;
  24.         current_max = max(current_max, a[i]);
  25.     }
  26.  
  27.     // Tính max_right
  28.     current_max = a[n - 1];
  29.     for (int i = n - 2; i >= 0; --i) {
  30.         max_right[i] = current_max;
  31.         current_max = max(current_max, a[i]);
  32.     }
  33.  
  34.     ll res = -1;
  35.     for (int j = 1; j < n - 1; ++j) {
  36.         if (max_left[j] >= a[j] && max_right[j] >= a[j]) {
  37.             ll depth = max_left[j] + max_right[j] - 2 * a[j];
  38.             res = max(res, depth);
  39.         }
  40.     }
  41.  
  42.     cout << res << '\n';
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5284KB
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https://ideone.com/EK4BGu
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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