Yeah Actually, I still couldn't understand the intuition behind iterating 100 times from front and back. Was it pure luck/ hit and trial or am I missing something here?

Can anyone help me in problem C Code1 is accepted while Code2 is giving TLE?

Base logic for both are same the only difference in Code2 we are iterating for all occurrences but in Code1 101 occurrences from start and 101 from end.