GeeksforGeeks

Count of substrings with the frequency of at most one character as Odd

Last Updated: 03 April 2023

Given a string S of N characters, the task is to calculate the total number of non-empty substrings such that at most one character occurs an odd number of times.Example:I...read more

Difference of count of distinct elements present to left and right for each array element

Last Updated: 15 February 2023

Given an array arr[] consisting of N integers, the task for each array element is to find the absolute difference between the count of distinct elements to the left and th...read more

Count of pairs in Array with difference equal to the difference with digits reversed

Last Updated: 15 November 2021

Given an array arr[] of N integers, the task is to find the number of pairs of array elements (arr[i], arr[j]) such that the difference between the pairs is equal to the d...read more

Maximum subarray sum with same first and last element formed by removing elements

Last Updated: 25 November 2021

Given an array arr[] of N integers, the task is to find the maximum sum of subarray having length an at least 2 whose first and last elements are the same after removing a...read more

Sum of nodes within K distance from target

Last Updated: 11 November 2023

Given a binary tree, a target node and a positive integer K on it, the task is to find the sum of all nodes within distance K from the target node (including the value of ...read more

Introduction to Hashing

Last Updated: 21 March 2025

Hashing refers to the process of generating a small sized output (that can be used as index in a table) from an input of typically large and variable size. Hashing uses m...read more

What is the difference between Hashing and Hash Tables?

Last Updated: 13 December 2022

What is Hashing?Hashing refers to the process of generating a fixed-size output from an input of variable size using the mathematical formulas known as hash functions. Thi...read more

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Last Updated: 15 December 2022

What is Hash Table?An array that stores pointers to records corresponding to a given element. An entry in the hash table is NIL if no existing element has a hash function ...read more

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Trie

HashTable

Hash Table Data Structure

Last Updated: 25 March 2025

What is Hash Table?A Hash table is defined as a data structure used to insert, look up, and remove key-value pairs quickly. It operates on the hashing concept, where each ...read more

Rectangular Plane Division - Min and Max Coordinates

Last Updated: 08 October 2023

There is a rectangular plane with dimensions W * H which occupies rectangular area {(x,y): 0 ≤ x ≤ W, 0 ≤ y ≤H. There are N coordinates represented by array cor[][2] and T...read more

Find the minimum swaps to group K elements.

Last Updated: 30 November 2023

Given an integer array arr[] of length n and an integer K, the task is to determine the minimum number of swaps required to group at least K occurrences of the same elemen...read more

Length after removing Invalid K-Length Substrings

Last Updated: 07 November 2023

Given a string 'S' of length N which consists of both Uppercase and Lowercase English alphabets and a positive integer K (1 = K = N), the task is to return the length of t...read more

Geeks Premier League 2023

How to Add or Update Elements in a HashTable in Java?

Last Updated: 07 February 2024

In Java, HashTable is a pre-defined class of the collection framework. It is a part of the java.util package and is used to store the key-value pairs in the program. In th...read more

How to Convert a HashTable to Other Collections Types in Java?

Last Updated: 12 February 2024

In Java, a Hashtable is a data structure that stores the data in the form of key and value pairs. And each key is mapped to a specific value. It implements the Map interfa...read more

Last Updated: 25 September 2024

Fizz Buzz problem states that given an integer n, for every integer i = n, the task is to write a C++ program to print,'FizzBuzz' if i is divisible by 3 and 5, 'Fizz' if i...read more