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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. const int MaxN = 1e6 + 5;
  4. long long n, a[MaxN];
  5. int main()
  6. {
  7.     ios_base::sync_with_stdio(0);
  8.     cin.tie(0);
  9.     freopen("file.inp", "r", stdin);
  10.     freopen("file.out", "w", stdout);
  11.    cin >> n;
  12.  
  13.     long long mx = 0;
  14.     for (int i = 1; i <= n; i++)
  15.     {
  16.         cin >> a[i];
  17.         mx = max(mx, a[i]);
  18.     }
  19.  
  20.     long long res = mx - a[1];
  21.     for (int i = 2; i <= n; i++)
  22.     {
  23.         res += max(0LL, a[i - 1] - a[i]);
  24.     }
  25.  
  26.     cout << res << "\n";
  27.  
  28.     return 0;
  29. }
  30.  
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/8JW7Vk
language:
C++14 (gcc 8.3)
created:
2 hours ago
visibility:
public

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