Happiest Minds Technologies Graduate Trainee Interview Questions and Answers

Easy numerics, logical, coding, technical

Q1. Reverse a array
Ans. 
Reverse an array of integers in place
• Create two pointers, one at the start and one at the end of the array

• Swap the elements at the two pointers and move them towards the center until they meet

• Time complexity: O(n), Space complexity: O(1)
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Q2. Create a list of duplicates in array
Ans. 
Function to find duplicates in an array of integers and return a list of unique duplicates.
• Iterate through the array and keep track of elements seen before using a hash set.

• If an element is already in the hash set, add it to the result list.

• Return the list of unique duplicates found.
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