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a53

SumeGaussDeSumeGauss

a53
Jun 29th, 2021
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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int n, nr;
  4. unsigned long long p, a;
  5.  
  6. int main()
  7. {
  8. ios_base::sync_with_stdio(0);
  9. cin.tie(0);
  10. cout.tie(0);
  11. cin>>n;
  12. for(int i=1; i<=n; ++i)
  13. {
  14. cin>>nr;
  15. if(nr%2)
  16. {
  17. a=(nr-1)/2;
  18. if(a%3==0)
  19. p=1ULL*2*(a/3)*(a+1)*(2*a+1) + 1ULL*nr*((nr+1)/2);
  20. else if((a+1)%3==0)
  21. p=1ULL*2*a*((a+1)/3)*(2*a+1) + 1ULL*nr*((nr+1)/2);
  22. else if((2*a+1)%3==0)
  23. p=1ULL*2*a*(a+1)*((2*a+1)/3) + 1ULL*nr*((nr+1)/2);
  24. else
  25. p=1ULL*2*a*(a+1)*(2*a+1)/3 + 1ULL*nr*((nr+1)/2);
  26. }
  27. else
  28. {
  29. a=nr/2;
  30. if(a%3==0)
  31. p=1ULL*2*(a/3)*(a+1)*(2*a+1);
  32. else if((a+1)%3==0)
  33. p=1ULL*2*a*((a+1)/3)*(2*a+1);
  34. else if((2*a+1)%3==0)
  35. p=1ULL*2*a*(a+1)*((2*a+1)/3);
  36. else
  37. p=1ULL*2*a*(a+1)*(2*a+1)/3;
  38. }
  39. cout<<p<<" ";
  40. }
  41. return 0;
  42. }
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