# Category Archives: Data Structures

## Count index pairs which satisfy the given condition

Given a permutation P of first N natural numbers, the task is to count the index pairs (i, j) such that P[i] + P[j] =… Read More »

## Difference between data type and data structure

Data Type A data type is the most basic and the most common classification of data. It is this through which the compiler gets to… Read More »

## Count distinct points visited on the number line

Given a person who is at position current_pos and a binary string path which is the moves the person took, if path[i] = ‘0’ then… Read More »

## Difference between Stack and Queue Data Structures

Stack A stack is a linear data structure in which elements can be inserted and deleted only from one side of the list, called the… Read More »

Introduction to Singly linked list : A singly linked list is a set of nodes where each node has two fields ‘data’ and ‘link’. The… Read More »

## Maximum number of leaf nodes that can be visited within the given budget

Given a binary tree and an integer b representing budget. The task is to find the count of maximum number of leaf nodes that can… Read More »

## Johnson’s algorithm for All-pairs shortest paths | Implementation

Given a weighted Directed Graph where the weights may be negative, find the shortest path between every pair of vertices in the Graph using Johnson’s… Read More »

## FIFO (First-In-First-Out) approach in Programming

FIFO is an abbreviation for first in, first out. It is a method for handling data structures where the first element is processed first and… Read More »

## FIFO vs LIFO approach in Programming

Prerequisite – FIFO (First-In-First-Out) approach in Programming FIFO is an abbreviation for first in, first out. It is a method for handling data structures where… Read More »

## Sentence that contains all the given phrases

Given a list of sentences and a list of phrases. The task is to find which sentence(s) contain all the words in a phrase and… Read More »

## Check if two trees have same structure

Given two binary trees. The task is to write a program to check if the two trees are identical in structure. In the above figure… Read More »

## UGC-NET | UGC NET CS 2018 July – II | Question 70

Consider a hash table of size seven, with starting index zero, and a hash function (7x+3) mod 4. Assuming the hash table is initially empty,… Read More »

## Advantages of vector over array in C++

We have already discussed arrays and vectors. In this post, we will discuss advantages of vector over normal array. Advantages of Vector over arrays :… Read More »

## Data Structures and Algorithms | Set 37

Que – 1. For 8 keys and 6 slots in a hashing table with uniform hashing and chaining, what is the expected number of items… Read More »

## Data Structures and Algorithms | Set 36

Que – 1. The function shiftNode() which takes as input two linked lists- destination and source. It deletes front node from source and places it… Read More »