## How to write Regular Expressions?

A regular expression (sometimes called a rational expression) is a sequence of characters that define a search pattern, mainly for use in pattern matching with… Read More »

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A regular expression (sometimes called a rational expression) is a sequence of characters that define a search pattern, mainly for use in pattern matching with… Read More »

We have been trying to organize content of geeksforgeeks. We added below pages for this purpose. C C++ Java Python Algorithms Interview Corner GATE Corner… Read More »

Given a string, find out if string follows a given pattern or not without using any regular expressions. Examples: Input: string – GraphTreesGraph pattern -… Read More »

Given an empty set initially and a number of queries on it, each possibly of the following types: Insert – Insert a new element ‘x’.… Read More »

Prerequisites: Minimax Algorithm in Game Theory, Evaluation Function in Game Theory Let us combine what we have learnt so far about minimax and evaluation function… Read More »

Given a very long list of URLs, find out last unique URL. Only one traversal of all URLs is allowed. My Personal Notes arrow_drop_up Save

Given a positive integer, find maximum integer possible by doing at-most K swap operations on its digits. Examples: Input: M = 254, K = 1… Read More »

Given a square maze containing positive numbers, find all paths from a corner cell (any of the extreme four corners) to the middle cell. We… Read More »

Motivation To approximate the shortest path in real-life situations, like- in maps, games where there can be many hindrances. We can consider a 2D Grid… Read More »

Given an integer array, find number of ways to calculate a target number using only array elements and addition or subtraction operator. Example: Input: arr[]… Read More »

Given a set of n integers where n <= 40. Each of them is at most 1012, determine the maximum sum subset having sum less… Read More »

Given an array a[0 . . . n-1]. We should be able to efficiently find the GCD from index qs (query start) to qe (query… Read More »

CRC or Cyclic Redundancy Check is a method of detecting accidental changes/errors in communication channel. CRC uses Generator Polynomial which is available on both sender… Read More »

Consider a situation with a number of persons and following tasks to be performed on them. Add a new friendship relation, i.e., a person x… Read More »

Let there be N workers and N jobs. Any worker can be assigned to perform any job, incurring some cost that may vary depending on… Read More »