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Feb 28th, 2020
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  1. #include <fstream>
  2. #include <iostream>
  3. using namespace std;
  4.  
  5. ifstream f("progresie3.in");
  6. ofstream g("progresie3.out");
  7. long a,b,i,j,t,k=1,n=0,Max=0,y,z,c,p=1,ln=1,v[1001],m,r,x1,x2;
  8. float s=0,nr=0,x;
  9. int ok=1;
  10.  
  11.  
  12. int main()
  13. {
  14. while(f>>n)
  15. v[n]=1;
  16. i=1;
  17. while(i<=1000)
  18. {
  19. if(v[i]==1)
  20. {
  21. x1=i;
  22. break;
  23. }
  24. i++;
  25. }
  26. i=1;
  27. while(i<=1000)
  28. {
  29. if(v[i]==1 && i!=x1)
  30. {
  31. x2=i;
  32. break;
  33. }
  34. i++;
  35. }
  36. r=x2-x1;
  37. for(i=x1+1;i<=1000;i++)
  38. {
  39. if(v[i]==1 && i-x1!=r) ok=0;
  40. else if(v[i]==1 && i-x1==r) x1=i;
  41. }
  42.  
  43. if(ok) g<<r;
  44. else g<<"NU";
  45. return 0;
  46. }
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