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Amazon Interview Question

Introduction To Number Theory ( Part 1 )

December 27, 2017 by Dhaval Dave

Number Theory is used a lot for solving real world problems and for the same reason It’s asked most of the time in interviews. This article marks the beginning of series of articles over Number … Read More

Filed Under: Algorithm, Amazon Interview Question, Flipkart Interview Questions, Interview Questions, Microsoft Interview Questions Tagged With: Euclid's Algorithm, Modular Exponentiation, Number Theory

Closed Parentheses checker

December 26, 2017 by Dhaval Dave

example explaining problem

‏Problem Statement:

You are given 3 types of parentheses (),{},[]. Now you are supposed to check whether a given string containing some parentheses is closed or not.

example depicting closed sequence… Read More

Filed Under: Amazon Interview Question, Interview Questions Tagged With: algorithm, backtracking

Regular Expression Matching

December 22, 2017 by Dhaval Dave

You are given a string T which consists of 0’s and 1’s. Now you input two non-empty strings U and V. Then your task is to match the Regular Expression  – U*V with the given … Read More

Filed Under: Algorithm, Amazon Interview Question, Interview Questions Tagged With: implementation, kmp matching, string

Knight Tour Problem (Graph – Breadth First Search)

December 22, 2017 by Dhaval Dave

Knight Tour Problem : Given a chess board of size n x n, initial position of knight and final position of knight. We need to find the minimum number of steps required to reach final … Read More

Filed Under: Algorithm, Amazon Interview Question, Flipkart Interview Questions, Graph, Microsoft Interview Questions Tagged With: algorithm, BFS, Graph

Maximum size of square sub matrix with all 1’s in a binary matrix

December 12, 2017 by Dhaval Dave

Maximum size of square sub matrix with all 1

Consider a binary matrix as shown in the figure below. You need to find the maximum size of square sub matrix with all 1’s.

Sample problem
… Read More

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

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

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

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

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