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Interview Questions

Count Possible Decodings of a given Digit Sequence

February 10, 2015 by Dhaval Dave

Find number of ways a string can be decoded into, if A=1, B=2, C=3 … Z=25 and encoding number is 123 ways decoding can be done is
1 2 3 = A B C
1
… Read More

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

Find the element that appears once others appears thrice

January 27, 2015 by Dhaval Dave

Given an array where every element occurs three times, except one element which occurs only once. Find the element that occurs once.
Expected time complexity is O(n) and O(1) extra space.
Examples:
Input: arr[] =
… Read More

Filed Under: Amazon Interview Question, Interview Questions, Microsoft Interview Questions, problem Tagged With: Array, Bit Arithmeticm

Find the smallest window in a string containing all characters of another string

January 12, 2015 by Dhaval Dave

Given two strings string1 and string2, find the smallest substring in string1 containing all characters of string2 efficiently.For Example:

Input string1: “this is a test string”
Input string2: “tist”

Output string: “t stri”

… Read More

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

Find if a binary tree is height balanced ?

January 12, 2015 by Dhaval Dave

A Height Balanced Tree is tree where for each node this condition is true.
– The difference between heights of left subtree and right subtree for any node is not more than 1.So we can
… Read More

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

Check if an array has duplicate numbers in O(n) time and O(1) space

January 8, 2015 by Dhaval Dave

We have array  a[ ]= {1, 2, 3, 4, 5, 6, 7, 8, 4, 10};
And we need to find a number which is duplicate in O(n) and Space complexity O(1)

Method 1 ) Sorting

… Read More

Filed Under: Adobe Interview Questions, Interview Questions, problem Tagged With: Array

Find the number ABCD such that when multipled by 4 gives DCBA.

January 7, 2015 by Dhaval Dave

We need to find a number ABCD such that,  4(ABCD) = DCBA
These problems can be tricky and/or tedious, but this one isn’t too bad.Method 1 ) Forming Equations and Solving them
… Read More

Filed Under: Flipkart Interview Questions, Interview Questions, Microsoft Interview Questions, problem Tagged With: Mathematical, Puzzle

Word Break Problem

December 30, 2014 by Dhaval Dave

Wordbreak Problem
Given an input string and a dictionary of words, find out if the input string can be segmented into a space-separated sequence of dictionary words. See following examples for more details.
This is a famous
… Read More

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

Puzzle : 100 doors in a row Visit and Toggle the door. What state the door will be after nth pass ?

December 23, 2014 by Dhaval Dave

you have 100 doors in a row that are all initially closed. you make 100 passes by the doors starting with the first door every time. the first time through you visit every door and
… Read More

Filed Under: Adobe Interview Questions, Flipkart Interview Questions, Interview Questions, Microsoft Interview Questions Tagged With: Mathematical, Puzzle

Longest Increasing Subsequence

December 22, 2014 by Dhaval Dave

The longest Increasing Subsequence (LIS) problem is to find the length of the longest subsequence of a given sequence such that all elements of the subsequence are sorted in increasing order.For example, length of LIS
… Read More

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

Level order traversal in Spiral form

December 21, 2014 by Dhaval Dave

Write a function to print spiral order traversal of a tree or Write function for Tree traversal in Spiral ZigZag form
For below tree, function should print 1, 2, 3, 7, 6, 5, 4.

           [1]
          
… Read More

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

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