My Solution to the Problem of Round #749 D is giving TLE on a very small test , though it could be an infinite loop , I cross checked on my PC and custom test on Codeforces and it runs fine for the same test.

If anyone could tell me what this is , I would be really grateful !!

Thanks a Lot !

https://codeforces.net/contest/1249/submission/74376059

i dont understand what is the error saying . I need help on this please!