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Array Sum Except First and Last

Last Updated: 02 May 2026

You are given an array arr of numbers. Return the sum of all the elements except the first and last elements.Examples:Input: arr[] = [5, 24, 39, 60, 15, 28]Output: 138Expl...read more

First Occurrence in Sorted

Last Updated: 27 April 2026

Given a sorted array arr[] and an integer k, find the position(0-based indexing) at which k is present in the array using binary search. If k doesn't exist in arr[] return...read more

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

1s Surrounded by 0s

Last Updated: 24 April 2026

Given an m * n binary matrix grid[][], find the total count of all cells containing 1 that are unable to move out of the grid through a path of adjacent 1s.Adjacency means...read more

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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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Last Coin in a Game of Alternates

Last Updated: 08 May 2026

Given an array arr[] of size n representing the values of coins arranged in a row.Two players play a game by picking coins alternately. At each turn, a player can pick a c...read more

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

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