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  1. #include <bits/stdc++.h>
  2. #include <ext/pb_ds/assoc_container.hpp>
  3. #include <ext/pb_ds/tree_policy.hpp>
  4.  
  5. using namespace std;
  6. using namespace __gnu_pbds;
  7. using ll = long long;
  8. using ld = long double;
  9.  
  10. #define all(x)  x.begin(),x.end()
  11. #define v(x) vector<x>
  12. #define nl '\n'
  13. #define fxd(x) fixed << setprecision(x)
  14. template<class t> using ordered_set = tree<t, null_type, less<t>, rb_tree_tag, tree_order_statistics_node_update>;
  15. template<class t> using ordered_multiset = tree<t, null_type, less_equal<t>, rb_tree_tag, tree_order_statistics_node_update>;
  16.  
  17.  
  18. int main()
  19. {
  20.     ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
  21.     int n; cin >> n;
  22.     v(ll) arr(n);
  23.     ll cnt =0;
  24.     for(int i = 0; i < n ; i++) cin >> arr[i];
  25.     for (int i = 1; i < n; i++)
  26.     {
  27.         if(arr[i] < arr[i-1])
  28.         {
  29.             cnt += arr[i-1]-arr[i];
  30.             arr[i] = arr[i-1];
  31.         }
  32.     }
  33.     cout << cnt;
  34. }
Success #stdin #stdout 0.01s 5328KB
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https://ideone.com/dTifGp
language:
C++ (gcc 8.3)
created:
2 hours ago
visibility:
public

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