Given an array of integers and a number x. check if there exists two elements in the array whose sum = x.

Given the linked list implementation of a generic queue in Java.

Given a multi-level linked list as shown in this post. Write code to search in such a list.

Given a linked list, where each node has a pointer to the head of its child list (in addition to the next pointer). The child list is a normal linked list with each node having one data and one pointer to the next node in the child list. Let the lists be arranged (as above) […]

Given a linked list, write code to print the list in forward and backward order. Solution: This problem is discussed as an example in this post. A linked list is a data structure where address of next node is stored inside each node. Structure of Node Structure of Node of a list is as given […]

Given an array of unsigned integers, print all the numbers that have more than k bits set in their binary representation. For example, if k = 2, and input array is: int arr[] = {2, 1, 15, 9, 7, 14, 32, 127}; Then the output should be: 15 7 14 127 Because all of these […]

Given a string that may have white spaces, write code to remove all white spaces from than string. For example: Input String: “IT IS HOT OUTSIDE” Output String: “ITISHOTOUTSIDE” Input String: ” I T I S HOT ” Output String: “ITISHOT”

The question below is given in the format in which questions are asked on coding interview Platforms like HackerRank, CodeChef, CodeJam, etc. PROBLEM STATEMENT Vertical level of a node is the vertical distance of that node from the root. Vertical level of the root node is 0. If a node is at vertical level k, […]

Given a linked list, rearrange the node of the list as shown below: INPUT LIST: 1 -> 2 -> 3 -> 4 -> 5 -> 6 -> 7 -> 8 OUTPUT: 1 -> 8 -> 2 -> 7 -> 3 -> 6 -> 4 -> 5 INPUT LIST: 1 -> 2 -> 3 -> 4 […]

We have already seen the code to merge two sorted linked list, such that the final list is also sorted. The logic and code can be found in this post. In this post, we want to merge the two lists in a way that in the final list, element comes from the two lists alternately […]