Word Search : Given a 2D board and a word, search if the word exists in the grid.

The word can be constructed from letters of sequentially adjacent cell,

where “adjacent” cells are those horizontally … Read More

# Recursion

## Leetcode: Edit Distance

Given two words *word1* and *word2*, find the edit distance between word1 and word2 i.e. minimum number of operations required to convert *word1* to *word2*.

You have the following 3 operations permitted on … Read More

## Print Power Set of a Set

## Print Power Set of a Set of character.

**Power SetÂ **Power set P(S) of a set S is the set of all subsets of S. For example S = {a, b, c} then P(s) =

## ‘N’ Story Building, with 1,2,3 steps how many ways can a person reach top of building.

A building has n steps. A person can take 1,2 or 3 steps. In how many ways can a person reach top of building.

In order to build logic, lets think from first step

If … Read More

## Count number of ways to reach a given score in a game

Consider a game where a player can score 3 or 5 or 10 points in a move. Given a total score n, find number of ways to reach the given score.Examples:

Input: n = 20

… Read More Input: n = 20