AtCoder Beginner Contest 233 (ABC233) Post Contest Solutions A,B,C,D,E (C++)

 Problems and Solutions- 

A- 10yen Stamp 

https://contestsolver.blogspot.com/2021/12/abc233a.html

B- A Reverse

https://contestsolver.blogspot.com/2021/12/abc233b.html

C- Product 

https://contestsolver.blogspot.com/2021/12/abc233c.html

D-Count Interval 

https://contestsolver.blogspot.com/2021/12/abc233d.html

E-- Σ[k=0..10^100]floor(X／10^k)

https://contestsolver.blogspot.com/2021/12/abc233e.html