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Stepping Numbers
September 8, 2016

Given two integers ‘n’ and ‘m’, find all the stepping numbers in range [n, m]. A number is called stepping number if all adjacent digits… Read More »

September 8, 2016

Given two integers ‘n’ and ‘m’, find all the stepping numbers in range [n, m]. A number is called stepping number if all adjacent digits… Read More »

July 23, 2016

We have discussed flattening of a multi-level linked list where nodes have two pointers down and next. In the previous post, we flattened the linked… Read More »

May 19, 2016

There are two common ways to traverse a graph, BFS and DFS. Considering a Tree (or Graph) of huge height and width, both BFS and… Read More »

March 28, 2016

What is a Mother Vertex? A mother vertex in a graph G = (V,E) is a vertex v such that all other vertices in G… Read More »

March 12, 2016

Given a directed graph, check whether the graph contains a cycle or not. Your function should return true if the given graph contains at least… Read More »

February 22, 2016

What are BFS and DFS for Binary Tree? A Tree is typically traversed in two ways: Breadth First Traversal (Or Level Order Traversal) Depth First… Read More »

December 16, 2015

In this post “Important top 10 algorithms and data structures for competitive coding “. Topics : Graph algorithms Dynamic programming Searching and Sorting: Number theory… Read More »

December 9, 2015

In this post “Top 10 coding problems of important topics with their solutions ” are written. If you are preparing for a coding interview, going through… Read More »

October 23, 2015

Depth First Traversal (or Search) for a graph is similar to Depth First Traversal (DFS) of a tree. The only catch here is, unlike trees,… Read More »

October 16, 2015

A number is called as a Jumping Number if all adjacent digits in it differ by 1. The difference between ‘9’ and ‘0’ is not… Read More »

August 24, 2015

Given a list of contacts containing username, email and phone number in any order. Identify the same contacts (i.e., same person having many different contacts)… Read More »

June 12, 2015

Given an undirected graph, print all connected components line by line. For example consider the following graph.

April 12, 2015

Given a list of word lists How to print all sentences possible taking one word from a list at a time via recursion?

January 15, 2015

Given a directed graph, a source vertex ‘s’ and a destination vertex ‘d’, print all paths from given ‘s’ to ‘d’.

January 2, 2015

Given a dictionary, a method to do lookup in dictionary and a M x N board where every cell has one character. Find all possible… Read More »