ClearTrail Technologies Interview Questions and Answers

Invert binary tree

Round duration - 25 minutes
Round difficulty - Easy

This was face to face interview round. All questions asked by the interviewer were based on data structures.

Q1. How do you detect a loop in a linked list?
Ans. 
Detecting a loop in a linked list involves using two pointers to traverse the list, one moving one node at a time and the other moving two nodes at a time.
• Start with two pointers at the beginning of the linked list.

• Move one pointer one node at a time and the other pointer two nodes at a time.

• If there is a loop, the two pointers will eventually meet at the same node.
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Q2. Check whether two given strings are anagrams of each other.
Ans. 
Check if two strings are anagrams of each other.
• Create character frequency maps for both strings

• Compare the frequency maps to check if they are equal

• Handle edge cases like case sensitivity and whitespace
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