Codeforces 1107B. Digital root Solution

Solve in  C++:

1. ///**********ALLAH IS ALMIGHTY************///
2. ///AH Tonmoy
3. ///Department of CSE,23rd Batch
4. ///Islamic University,Bangladesh
5. #include<iostream>
6. #include<vector>
7. using namespace std;
8. int main()
9. {
10. long long n,t,a,b,r;
11. cin>>t;
12. while(t--)
13. {
14. cin>>a>>b;
15. r=b+(9*(a-1));
16. cout<<r<<endl;
17. r=0;
18. }
19. }