Software Engineer

You have been given an array/list 'arr' consisting of 'n' elements.

Each element in the array is either 0, 1 or 2.

Sort this array/list in increasing order.

Do not make a new array/list. Make changes in the given array/list.

Example :

Input: 'arr' = [2, 2, 2, 2, 0, 0, 1, 0]

Output: Final 'arr' = [0, 0, 0, 1, 2, 2, 2, 2]

Explanation: The array is sorted in increasing order.

You have been given a Binary Tree having 'n' nodes.

A Symmetric tree is a binary tree whose mirror image is the same as the original tree.

Find out whether the given tree is symmetric or not.

Example :

Input: Let the binary tree be:

Output: YES

Explanation: As we can see in the image, the original tree is the same as the mirrored tree.

Write a code to find frequency of duplicate elements from an array.

Write psuedo code to reverse a linked list

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