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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void solve() {
  5.     int n;
  6.     cin >> n;
  7.     vector<int> h(n);
  8.     for (int i = 0; i < n; i++) {
  9.         cin >> h[i];
  10.     }
  11.  
  12.     int operations = 0;
  13.     int target = h[n - 1]; // Start from the last pillar
  14.  
  15.     for (int i = n - 2; i >= 0; i--) {
  16.         if (h[i] > target) {
  17.             operations += (h[i] - target);
  18.         } else {
  19.             target = h[i];
  20.         }
  21.     }
  22.  
  23.     cout << operations << endl;
  24. }
  25.  
  26. int main() {
  27.     ios::sync_with_stdio(false);
  28.     cin.tie(nullptr);
  29.  
  30.     int t;
  31.     cin >> t;
  32.     while (t--) {
  33.         solve();
  34.     }
  35.  
  36.     return 0;
  37. }
Success #stdin #stdout 0.01s 5284KB
comments (?)
stdin
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3
5
5 4 3 2 1
3
2 2 1
1
1
stdout
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10
2
0
https://ideone.com/5VoJ1L
language:
C++ (gcc 8.3)
created:
11 days ago
visibility:
public

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