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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define el "\n"
  4. #define ll long long
  5. #define ull unsigned long long
  6. #define se second
  7. #define fi first
  8. #define be begin()
  9. #define en end()
  10. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  11.  
  12. int main()
  13. {
  14.     Faster;
  15.     int x, n; cin >> x >> n;
  16.     int a[n];
  17.     for(auto &x : a) cin >> x;
  18.     int ans = 0;
  19.     for(int i = 0; i < n; i++)
  20.     {
  21.         ans = x + ans - a[i];
  22.         if(ans < 0)
  23.         {
  24.             cout << -1;
  25.             return 0;
  26.         }
  27.     }
  28.     cout << ans + x;
  29.     return 0;
  30. }
  31.  
Success #stdin #stdout 0.01s 5272KB
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stdin
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stdout
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https://ideone.com/X03xX0
language:
C++14 (gcc 8.3)
created:
9 days ago
visibility:
public

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