Experience |
iQuanti, Tracxn, Oracle, Pragma, VVP Engineering College |

Education |
M.Tech NITWarangal, B.Tech Saurashtra University |

Research |
“An Effective Black hole Attack Detection Mechanism using PBAck MANET” |

LinkedIn |
in.linkedin.com/in/davedhaval87 |

Contact |
davedhaval87@gmail.com |

**____________________________________________**

**Proposed Unique Code Solutions**

47) Mirror of Tree

46) Count Possible Decodings of a given Digit Sequence

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

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

43) Word Break Problem

42) Puzzle : 100 doors in a row Visit and Toggle the door

41) Maximum of all subarrays of size k

40) Level order traversal in spiral form

39) Longest Increasing Subsequence

38) HackerEarth : The Magic HackerEarth Nirvana solutions Hiring Challenge

37) Kony : Given LinkedList Divide LL in N Sub parts and delete first K nodes of each part

36) LimeRoad : Find two non repeating elements in an array of repeating elements

35) Sort Stack in place

34) HackerEarth : Flipkart’s Drone Link for Question Link for Solution

33) Puzzle : 8 teams are participating. Each team plays twice with all other teams. 4 of them will go to the semi final. Minimum and Maximum how many matches should a team win

32) Common Ancestor in a Binary Tree And/OR Binary Search Tree

31) Given array of 0’s and 1’s. All 0’s are coming first followed by 1’s. find the position of first 1

30) Generate next palindrome number

29) Print all nodes that are at distance k from a leaf node

28)FaceBook : Max Sum in circularly situated Values

27) Given Set of words or A String find whether chain is possible from these words or not

26) Connect n ropes with minimum cost

25) Sort an array according to the order defined by another array

24) Implement LRU Cache

23) Amazon : Get Minimum element in O(1) from input numbers

22) Flipkart : TicTacToe Game As Asked in Flipkart

21) Amazon : Sort an array according to the order defined by another array

20) Amazon : Connect n ropes with minimum cost

19) Find an index i such that Arr [i] = i

18) Flipkart SDE2 : Check a String is SUBSEQUENCE of another String Find Minimum length for that ( DNA Matching )

17) Flipkart : Add Sub Multiply very large number stored as string

16) Code Chef’s PRGIFT

15) Code Chef’s Problem RRCOPY

14) Code Chef’s Problem SGARDEN

13) Amazon : Find Longest Consecutive sequence in Array of numbers

12) Flipkart/Amazon : Check Binary Tree is Binary Search Tree or not

11) Flipkart : Printing each word in string backwards

10) Amazon: Test Cases for Round Function

09) Flipkart : Find Percentage of Words matching in Two Strings

08) Flipkart : Wrong Directions given find minimum Moves so that he can reach to the destination

07) Amazon: Find next greater number with same set of digits

06) Amazon: 25 horses 5 tracks Find 3 fastest puzzle

05) HackerRank: Rectangular chocolate bar Create at least one piece which consists of exactly nTiles tiles

04) Amazon: N Petrol bunks or City arranged in circle. You have Fuel and distance between petrol bunks. Is it possible to find starting point so that we can travel all Petrol Bunks

03) Microsoft : Print vertical sum of all the axis in the given binary tree

02) Amazon : Function flatten() which flattens Linked List in sorted way

01) Amazon: Pythagorean Triplets in an array in O(N)

Other Articles

Nilesh Verma says

August 19, 2017 at 12:17 pmDhaval sir is by far the best data structures and algorithms mentor i have known till date.I am extremely glad and lucky to have a mentor like him. His approach to teaching data structures and algorithms is unique as he first helps in building the logic rather than rushing through code. Therefore a student can tackle any type of interview problem , if he/she studies carefully whatever is taught by him in class and can easily crack any top level company’s coding interview.