Given a pointer to the head node of a linked list, the task is to reverse the linked list. We need to switch the list by changing the links between nodes.

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Given an undirected graph. The task is to print all the Hamiltonian cycles present in the graph.

Given a binary tree, determine if is height-balanced.

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Given an array of distinct elements, which is formed from some places rotation of a sorted array, find if a given element is present in the array or not.

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Given 2 lists of words, find if there exists a sequence such that the concatenation of the words in this order, gives the same word for both lists.

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Given two strings, the task is to find the longest common substring present in the given strings in the same order.

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Given an array, a[], consisting of distinct elements, and a target sum, find all the unique combinations in the array where the sum is equal to the target sum.

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Given a string S of lowercase English characters ‘a’ – ‘z’. The task is to sort the string.

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Given a binary tree, return the reverse level order traversal of its nodes’ values. (i.e, from left to right and from the last level to starting level).

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Given an array of integers, the task is to remove the duplicates from the array.

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