Subtask 3 giving WA*
Problem link → https://www.codechef.com/problems/FEXP
Yes, it was WA. My bad. Edited.
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Hmmm … I have to admit, I’m drawing a blank, here 
The b % mod in long res = power(a%mod,((b%mod)/2))%mod; is wrong, but, assuming the constraints are correct, this shouldn’t make a difference in practice as we’ll always have b \le mod. Can you try it again with just b instead of b % mod?
Edit:
As I suspected - the constraints for the problem are wrong. Compare this solution (AC) vs this solution (RE) - the only difference is that the latter asserts that the constraints stated in the Problem are satisfied. smh
@vijju123 - any chance of getting the Problem description/ testcases updated for this question?
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Worked! Thanks 
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