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⇱ Data Structures-Hash Archives - GeeksforGeeks

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Hashing in Competitive Programming

Last Updated: 23 July 2025

Hashing is a fundamental technique in competitive programming that is used to efficiently manipulate and process large amounts of data. Data Structures like Hash Maps and ...read more

Data Structures-Hash

Find Number of Unique Elements in an Array After each Query

Last Updated: 23 July 2025

Given 2d array A[][1] of size N and array Q[][2] of size M representing M queries of type {a, b}. The task for this problem is in each query move all elements from A[a] t...read more

Geeks Premier League

Data Structures-Hash

Geeks Premier League 2023

Last Updated: 07 April 2026

A hash function is a function that takes an input (or key) of arbitrary size and converts it into a fixed-size value, called a hash value or hash code.For example, using t...read more

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Data Structures-Hash

Joining Tables using MultiMaps

Last Updated: 15 July 2025

Joining two different tables on their matching columns can be done using nested loops, but a more efficient and scalable way is to use multimaps. The idea is to map from e...read more

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Data Structures-Hash

Real-life Applications of Data Structures and Algorithms (DSA)

Last Updated: 03 October 2025

You may have heard that DSA is primarily used in the field of computer science. Although DSA is most commonly used in the computing field, its application is not restricte...read more

Data Structures

Data Structures-Binary Trees

Data Structures-Tree Traversals

Data Structures-Linked List

Data Structures-Stack

Data Structures-Queue

Data Structures-Graph

Data Structures-Balanced Binary Search Trees

Data Structures-Hash

Data Structures-Array

Data Structures-Misc

Data Structures-B and B+ Trees

Data Structures-Heap

Maximum absolute difference between distinct elements in an Array

Last Updated: 15 July 2025

Given an array arr[] of N integers, the task is to find the maximum absolute difference between distinct elements of the array.Examples:Input: arr[] = {12, 10, 9, 45, 2, 1...read more

Data Structures-Hash

Sudo Placement[1.4] | Jumping the Subtree

Last Updated: 29 August 2022

Given a binary search tree of n nodes with distinct values. Also given are Q queries. Each query consists of a node value that has to be searched in the BST and skip the s...read more

Preorder Traversal

Data Structures-Hash

cpp-unordered_map

Queries to insert, delete one occurrence of a number and print the least and most frequent element

Last Updated: 28 July 2025

Given Q queries of type 1, 2, 3 and 4 as described below.Type-1: Insert a number to the list.Type-2: Delete only one occurrence of a number if exists.Type-3: Print the lea...read more

Data Structures-Hash

C++-Operator Overloading