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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int OneDigit(int x)	//Kiem tra xem co phai 1 chu so hay khong?
  5. {
  6.     if (x>=0 && x<=9)
  7.        return 1;
  8.     return 0;
  9. }
  10.  
  11. int SumOfDigits(int x)	//Tinh tong cac chu so cua mot so
  12. {
  13.     int S = 0;
  14.     while (x!=0)
  15.     {
  16.         int mod = x%10;
  17.         S+=mod;
  18.         x=x/10;
  19.     }
  20.     return S;
  21. }
  22.  
  23. int FinalDigit (int x)
  24. {
  25.     while (1)
  26.     {
  27.         if (OneDigit(x)==1)
  28.            break;
  29.  
  30.         x = SumOfDigits(x);
  31.     }
  32.     return x;
  33. }
  34.  
  35. int main ()
  36. {
  37.     int T;
  38.     cin>>T;
  39.     while (T--)
  40.     {	
  41.         int x;
  42.         cin>>x;
  43.         cout<<FinalDigit(x)<<endl;
  44.     }
  45.     return 0;
  46. }
Success #stdin #stdout 0s 4328KB
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3
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https://ideone.com/I6dgtA
v- P151PROI - ROUND 1I - Chữ số cuối cùng
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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