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  1. //Bai 17
  2.  
  3. #include<bits/stdc++.h>
  4. using namespace std;
  5. #define el "\n"
  6. #define ll long long
  7. #define ull unsigned long long
  8. #define se second
  9. #define fi first
  10. #define be begin()
  11. #define en end()
  12. #define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
  13. int n,m;
  14. void Run()
  15. {
  16.     cin >> n >> m;
  17.     ll ans = 0;
  18.     for(int i = 0; i < n; i++)
  19.     {
  20.         for(int j = 0; j < m; j++)
  21.         {
  22.             int x; cin >> x;
  23.             if(i == 0 || i == n-1 || j == 0 || j == n-1) ans += 1ll*x;
  24.         }
  25.     }
  26.     cout << ans;
  27. }
  28. int main()
  29. {
  30.     Faster;
  31.     Run();
  32.     return 0;
  33. }
  34.  
  35.  
Success #stdin #stdout 0s 5264KB
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https://ideone.com/p2GR3d
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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