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Dhaval Dave

Edit Distance ( Dynamic Programming )

December 6, 2017 by Dhaval Dave

Problem

Given two strings x and y, What is the cheapest possible way to convert x into y where following operations are allowed to perform –

  1. Substitute a character c of x with c’.
  2. Insert
… Read More

Filed Under: Algorithm, Amazon Interview Question, Flipkart Interview Questions, Interview Questions, Microsoft Interview Questions Tagged With: Dynamic Programming, string

Skiing on Mountains Matrix

June 9, 2017 by Dhaval Dave

Skiing on Mountains Matrix : “John Snow” likes Skiing on Mountains a lot.That’s not very surprising, since skiing is really great. The problem with skiing is one have to slide downwards to gain speed. Also … Read More

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

Trapping Rain Water

May 25, 2017 by Dhaval Dave

trapping rain water

Trapping Rain Water or Water collected between towers : Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after … Read More

Filed Under: Amazon Interview Question, Hacker Earth Questions, Interview Questions, Uncategorized Tagged With: Array

The greedy coins game Dynamic Programming

April 24, 2017 by Dhaval Dave

The greedy coins game Dynamic Programming Solution :

Question statement There is a row of 2n coins on the table; each coin can have any positive integer value. Two players alternate turns.

On a player’s … Read More

Filed Under: Interview Questions, problem, Puzzle Tagged With: Dynamic Programming

Handle duplicates in Binary Search Tree

April 17, 2017 by Dhaval Dave

In a Binary Search Tree (BST), all keys in left subtree of a key must be smaller and all keys in right subtree must be greater. So a Binary Search Tree by definition has distinct … Read More

Filed Under: Amazon Interview Question, Flipkart Interview Questions, Hacker Earth Questions, Interview Questions, Microsoft Interview Questions, problem Tagged With: Binary Search Tree, Binary Tree

Minimum insertions to form a palindrome

April 15, 2017 by Dhaval Dave

Form Palindrome

Given a string, find the minimum number of characters to be inserted to form Palindrome string out of given string

Before we go further, let us understand with few examples:
ab: Number of insertions required … Read More

Filed Under: Amazon Interview Question, Flipkart Interview Questions, Hacker Earth Questions, Interview Questions, Microsoft Interview Questions, problem Tagged With: Dynamic Programming

Binary Tree Isomorphic to each other

March 22, 2017 by Dhaval Dave

Isomorphic tree

Find weather two given trees are isomorphic to each other or not.
Lets understand What is isomorphic strings

AAB and XXY are IsoMorphic to each other, consider A replaces/morphs as X and B as Y, … Read More

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

Naurki.com Security Breach

February 22, 2017 by Dhaval Dave

Naukri.com Security Bug found

Hi Folks, Today I am going to show and explain Security bug of Naukri.com from Mails, Being a Backend Coder and with knowledge of SQL injection and security breach issues, I … Read More

Filed Under: problem Tagged With: Hacking

Maximum occurred Smallest integer in n ranges

February 9, 2017 by Dhaval Dave

Maximum occurred integer in n range

Maximum occurred integer in n ranges

Given n ranges in the form of Start Number and End Number in Two Array L and R such that
L[i]-R[i] is one range given. Our task is to … Read More

Filed Under: Interview Questions, problem Tagged With: Array

Best Java Book | Top Java Programming Book for Beginners

August 26, 2016 by Dhaval Dave

Best Java Books

best java programming books

Being certified Java programmer SE 7, Enterprise Edition ( EE ) Application, etc. from Oracle & ex-Developer at Oracle, I can refer some of the best java books for learning.

Why Java?  Java is most … Read More

Filed Under: Interview Questions, problem, Uncategorized Tagged With: Java

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