Help me to find the solution

Question

https://code.sololearn.com/cU27p7VrtxMt/?ref=app

Answer 1

if i understood your problem right, its a casting problem with the pow function that results in rounding errors,
try this:

https://code.sololearn.com/cvjK2RXzrA1Z/?ref=app

Answer 2

Replace a = pow...
With:

a *= 10;
a++;