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Print Alternate Characters of a String

Last Updated: 20 April 2026

You are given a string s, you need to print its characters at even indices(index starts at 0).Examples:Input: s = "geeksforgeeks"Output: gesogesExplanation: The even indic...read more

Count Connected Components

Last Updated: 21 April 2026

Given an undirected graph with V vertices and a 2D integer array edges[][], where edges[i] = [u, v] represents an undirected edge between vertex u and vertex v. Two vertic...read more

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Dynamic Programming Practice Problems

Last Updated: 13 April 2026

Fundamentals of DPIntroduction to DP Nth Fibonacci NumbernCrFirst n Fibonacci Ways to Reach the n'th Stair Padovan Sequence Bits CountingNth Catalan Number Number of waysM...read more

Count Subarrays Matching Relative Pattern

Last Updated: 19 March 2026

Given an integer array arr[] of size n and another array pattern[] of size m containing values -1, 0, and 1, count the number of subarrays of size m + 1 such that the rela...read more

Prefix and Suffix Pair Count

Last Updated: 19 March 2026

Given an array of strings arr[], count the number of pairs (i, j) such that i j and the string arr[i] is both a prefix and a suffix of the string arr[j].Examples:Input: a...read more

Input and Output in Programming

Last Updated: 26 March 2026

Input and Output (I/O) are fundamental concepts in programming. Input allows a program to receive data from the user, files, or other sources, while output allows it to di...read more

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Input and Output

Functions in programming

Last Updated: 26 March 2026

A function is a block of code that performs a specific task and can be reused whenever needed.Avoids writing the same code again and again.Makes programs simple and easy t...read more

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Classes and Object in Programming

Last Updated: 24 March 2026

In Data Structures, programs often work with complex data and operations that need to be organized efficiently. Object-Oriented Programming concepts like classes and objec...read more

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Class and Object

Partition Array for Maximum Sum

Last Updated: 11 March 2026

Given an integer array arr[] and an integer k, partition the array into contiguous subarrays such that each subarray has a length of at most k. After partitioning, replace...read more

pattern-printing

Hollow Diamond Pattern

Last Updated: 11 March 2026

Given an integer N, print the pattern shown below.Examples:Input: N=5Output: Input: N=3Output: Using Nested Loops - O(n^2) Time and O(1) SpaceIterate through 2 × n − 1 r...read more

DSA-Coding-Pattern

Print Solid Rectangle Star Pattern

Last Updated: 13 March 2026

Given two integers n and m, print a solid rectangle pattern of stars with n rows and m columns. Each row has exactly m stars.Examples:Input: n = 3, m = 5Output: Input: n...read more

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DSA-Coding-Pattern

Printing Pyramid Patterns

Last Updated: 11 March 2026

Given a positive integer n, print a pyramid pattern consisting of stars (*) such that the number of rows equals n. The pyramid should be center-aligned as shown in the exa...read more

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DSA-Coding-Pattern

Right-Aligned Number Triangle

Last Updated: 11 March 2026

Given an integer N, print the pattern shown below.Examples:Input: N = 3Output: Input: N = 6 Output: Using Nested Loops - O(n^2) Time and O(1) SpaceThe pattern forms a rig...read more

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DSA-Coding-Pattern

Computing Point Counts from a Set of Intervals

Last Updated: 10 March 2026

Given n points on a line numbered from 1 to n, and a list of intervals, where each interval [l, r, count] adds count to every point from l to r (inclusive). Compute the to...read more

Count Subarrays with K Equal Value Pairs

Last Updated: 14 March 2026

Given an arrays arr[] integer and a positive integer k , find the number of subarray which contains atleast k pairs with equal value. The pair is defined as two indices (i...read more

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