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  1. #include <fstream>
  2. using namespace std;
  3. ifstream fin("suma6.in");
  4. ofstream fout("suma6.out");
  5. int special(int a)
  6. {
  7.     int aux=a,nr_cif=0;
  8.     while(aux>9)
  9.     {
  10.         nr_cif++;
  11.         aux/=10;
  12.     }
  13.     if(nr_cif%2==1)
  14.         return 0;
  15.     if(aux==a%10)
  16.         return 1;
  17.     return 0;
  18. }
  19. int cif_mij(int a)
  20. {
  21.     int aux=a,nr_cif=0;
  22.     while(aux)
  23.     {
  24.         nr_cif++;
  25.         aux/=10;
  26.     }
  27.     for(int i=1; i<=nr_cif/2; i++)
  28.         a/=10;
  29.     return a%10;
  30. }
  31. int main()
  32. {
  33.     int n,x,s=0;
  34.     fin>>n;
  35.     for(int i=1; i<=n; i++)
  36.     {
  37.         fin>>x;
  38.         if(special(x))
  39.             s+=cif_mij(x);
  40.     }
  41.     fout<<s;
  42.     return 0;
  43. }
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