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Dhaval Dave

LeetCode : Word Search

October 16, 2019 by Dhaval Dave

Word Search : Given a 2D board and a word, search if the word exists in the grid.
The word can be constructed from letters of sequentially adjacent cell,
where “adjacent” cells are those horizontally … Read More

Filed Under: Amazon Interview Question, Google, LeetCode Tagged With: 2d matrix, Array, DFS, Matrix, Recursion

Fibonacci Hashing & Fastest Hashtable

July 31, 2018 by Dhaval Dave

Fibonacci Hashing : How do we find out what this Fibonacci Hashing is?
In real world Fibonacci hashing is not implemented or used even a part of it, because it’s actually more (Time and Space) … Read More

Filed Under: Algorithm, Data Structure, problem Tagged With: Hashing, Hashmap, Mathematical

Hackerearth : Counting Subarrays

July 7, 2018 by Dhaval Dave

Given an array A of N positive integer values. A sub-array of this array is called Odd-Even sub-array if the number of odd integers in this sub-array is equal to the number  of even integers … Read More

Filed Under: Algorithm, Array, Hacker Earth Questions Tagged With: Array, Hashing, implementation

Facebook Interview Question : Interleave List

May 14, 2018 by Dhaval Dave

Interleave List

Interleave List If input = [[1,2,3], [9, 0], [5], [-4,-5,-2,-3,-1]] then output = [1,9,5,-4,2,0,-5,3,-2,-3,-1];
Asked in Facebook F2F… Read More

Filed Under: Algorithm, Data Structure, Facebook Tagged With: 2d matrix, Array, Linked List

Serialise Deserialise N-ary Tree

April 19, 2018 by Dhaval Dave

Serialise Deserialise N-ary Tree : N-ary tree’s each node contains at-most N children. Serialise the tree means storing the tree in array or file maintaining tree’s exact structure. On the other hand Deserialise the tree … Read More

Filed Under: Uncategorized

Number of Islands BFS/DFS

April 5, 2018 by Dhaval Dave

example for rejecting a component

Problem Statement:

Given a 2d grid containing either values either 0 or 1 where 1 represents land and 0 represents water. You have to calculate the number of total islands in the given grid. An … Read More

Filed Under: Adobe Interview Questions, Algorithm, Amazon Interview Question, Data Structure, Graph Tagged With: 2d matrix, BFS, DFS

Find shortest distances between every pair of vertices ( Dynamic Programming Floyd Warshall Algorithm)

February 23, 2018 by Dhaval Dave

Find shortest distances between every pair of vertices in a given edge weighted directed Graph.

Input:
The first line of input contains an integer T denoting the no of test cases . Then T test … Read More

Filed Under: Amazon Interview Question, Graph, Microsoft Interview Questions Tagged With: Dynamic Programming, Graph

Diagonal Traversal of Binary Tree

February 23, 2018 by Dhaval Dave

Given a Binary Tree, print the diagonal traversal of the binary tree
Consider lines of slope -1 passing between nodes. Given a Binary Tree, print all diagonal elements in a binary tree belonging to same … Read More

Filed Under: Adobe Interview Questions, Amazon Interview Question, Interview Questions, Microsoft Interview Questions, Tree Tagged With: BFS, Binary Tree, tree

Printing intermediate Integers between one element & next element of array

February 16, 2018 by Dhaval Dave

Problem : Printing intermediate Integers

User entered numbers are set into array.Intermediate integer of each pair of successive elements to be printed.

Input :
Input of 1st line is number of element in array,inputs of … Read More

Filed Under: Uncategorized

Coin Collection Dynamic Programming

February 4, 2018 by Dhaval Dave

Problem Statement:Coin Collection Dynamic Programming

Given a rectangular grid where each cell contains some coins. You are at the first row and you want to go to the last row with the objective of collecting … Read More

Filed Under: Algorithm, Interview Questions Tagged With: 2d matrix, Dynamic Programming

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