CareerCup

Problem statement: You are given a maze with N cells. Each cell may have multiple entry points but not more than one exit (ie. entry/exit points are unidirectional doors like valves). The cells are named with an integer value from 0 to N-1. You need to find the following :

Nearest meeting cell: Given any two cells - C1,C2, find the closest cell Cm that can be reached from both C1 and C2.

Note: Aim for O(Log(N)) solution.

INPUT FORMAT - First line has the number of cells N

Second line has list of N values of the edge[] array. edge[i] contains the cell number that can be reached from of cell ‘i’ in one step. edge[i] is -1 if the ‘i’th cell doesn’t have an exit.

Third line contains two cell numbers whose nearest meeting cell needs to be found. (return -1 if there is no meeting cell from the two given cells) .

OUTPUT FORMAT - Find nearest meeting cell (NMC).

Problem statement: You are given a maze with N cells. Each cell may have multiple entry points but not more than one exit (ie. entry/exit points are unidirectional doors like valves). The cells are named with an integer value from 0 to N-1. You need to find the following :

find Maximum number of entry points (incoming edges) for any cell in the maze

Note: Aim for O(N) solution.

INPUT FORMAT - First line has the number of cells N

Second line has list of N values of the edge[] array. edge[i] contains the cell number that can be reached from of cell ‘i’ in one step. edge[i] is -1 if the ‘i’th cell doesn’t have an exit.

OUTPUT FORMAT - Find max entry points in any cell.

Problem statement: You are given a maze with N cells. Each cell may have multiple entry points but not more than one exit (ie. entry/exit points are unidirectional doors like valves). The cells are named with an integer value from 0 to N-1. You need to find the following :

The length of the largest cycle in the maze. Return -1 if there are no cycles.

Note: Aim for O(N) solution.

INPUT FORMAT - First line has the number of cells N

Second line has list of N values of the edge[] array. edge[i] contains the cell number that can be reached from of cell ‘i’ in one step. edge[i] is -1 if the ‘i’th cell doesn’t have an exit.

OUTPUT FORMAT - length of the largest cycle.

Suppose there is a social networking site like Facebook. Every user gets some friend recommendations (i.e. People you may know!). Now, if there is a user A and he has 100 friends and each of his friends has got 5 other friends,A can get these 500 recommendations. But the condition is that he should only get the top 10 recommendations with whom he has the maximum number of mutual friends(If A and B are friends and B and C are friends, then A and C have a mutual friend, B). Suggest an efficient data structure for this and how to implement it. The implementation should be flexible as at any moment, any user can make new friends and he may also unfriend someone!

http://www.geeksforgeeks.org/find-water-in-a-glass/

Find the minimum of every sub-array of size k in an array of size n.

O(n) solution required.

http://www.geeksforgeeks.org/find-water-in-a-glass/

Find the minimum of every sub-array of size k in an array of size n.

O(n) solution required.

Searching for a string in a DOM tree. A complete working solution was required. Assume you have any string matching algorithm available.

(Based on Ctrl+F search in chrome)

Searching for a string in a DOM tree. A complete working solution was required. Assume you have any string matching algorithm available.

(Based on Ctrl+F search in chrome)

Given a directed graph G, duplicate the graph using minimum space.

How to find total number of greater number after all number in an array ?
Eg. Given array is,
5 3 9 8 2 6
o/p
3 3 0 0 1 0

You are given a list of tasks as an integer array, task_costs. Every i-th element of task_costs represents a task and requires task_costs[i] seconds to complete. All tasks listed in the array are independent of other tasks.

It is required to finish all the tasks independently and as soon as possible. You are given a single worker robot to start taking the tasks and finish them one at a time. However if you like, you can divide the worker robot in two. Each resulting robot can then be further divided into two and so on. There is a cost, in seconds, of dividing a robot in two, represented by robot_divide_cost.

You can assign an independent task to any available robot, however you can't interrupt or divide a robot while it is working on the assigned task. At the same time you can't assign a task to any robot while its in the process of getting divided.

To keep things simple you can't allow multiple robots to work on the same task. At any given time only one robot can work on a task and finish it. Once any particular robot finishes a task it can't be assigned any further tasks.

Given a list of tasks and cost of dividing a robot, find the least amount of time to finish all tasks.

Input:
3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,360,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600,3600
3600

Expected Output: 25200


Input:
1113,773,824,822,1458,1257,908,1320,780,1016,1066,861,1150,718,1405,738,718,980,1037,946,1121,1349,805,1378,1308,1272,1532,779,875,1392,982,1282,744,723,1033,1067,1158,1071,742,683,678,762,686,1143,862,1231,765,1472,1560,1085
3147

Expected Output: 20040

Given an array of numbers find the duplicates

Suppose you have a list of Dishes, where each dish is associated with a list of ingredients. Group together dishes with common ingredients.

E.g:
Input:
"Pasta" -> ["Tomato Sauce", "Onions", "Garlic"]
"Chicken Curry" --> ["Chicken", "Curry Sauce"]
"Fried Rice" --> ["Rice", "Onions", "Nuts"]
"Salad" --> ["Spinach", "Nuts"]
"Sandwich" --> ["Cheese", "Bread"]
"Quesadilla" --> ["Chicken", "Cheese"]

Output: ("Pasta", "Fried Rice") ("Fried Rice, "Salad") , ("Chicken Curry", "Quesadilla") ("Sandwich", "Quesadilla")

Follow up: What is the time and space complexity?

how to create a de-duplication engine that acts as a file storage, retrieval, and handling system. It must take some files as inputs, take data from it in chunks of 8 byte size and store it in some efficient data structure of our choice. The data structure should be robust and must not store duplicate chunks. Instead, it has to make a reference to the original chunk that is repeated.

Design a HTTP response service that will allow sync and async download. What classes would you create and the methods used with paramerters and return types.

[redacted]

Given a sparse matrix, implement below two methods:
void set(int row, int col, int val) /*Update value at given row and col*/

int sum(int row, int col) /*give sum from top left corner to given row, col sub-matrix*/

A company is looking for algorithm to show item recommendations.

If a customer bought A and B items and another buys A item, B should come as recommendations.
There are two types of recommendations based on the connections
1) Two items are strongly connected if a customer buys those items.
2) Two items are weakly connected if each items are strongly/weakly connected to another third item.

Provided the sample input
ABC

10

first:ABC
first:HIJ
sec:HIJ
sec:KLM
third:NOP
fourth:ABC
fourth:QRS
first:DEF
fifth:KLM
fifth:TUV

first, sec, third.. represents the customer names
ABC, HIJ... represents the item codes

For the Input item Id "ABC", since "ABC" is strongly connected to HIJ, DEF, QRS
and whereas ABC is weakly connected to KLM and TUV

the output should be count of strong and weak connection i.e., [3,2]

interview would be easy. For freshers it would be okay
for experienced no salary hike is available

pair programming example question with code for thoughworks interview

Design unix file system in database.

Suggest a data structure and implement efficient phrase search along with word search in a huge chunk of text.

There are n+1 loading docks. a permutation of boxes 1->n is placed on the first n. there is a fork that can move one box to an empty location at a time. Give an algorithm to sort then boxes with minimum number of moves.
Follow up: minimum distance

Given a dictionary and a string, find all the substrings that are valid words in dictionary.

I was thinking of a Trie solution but I'm not sure a Trie will work easily to match sub words that begin in the middle of the string.

Given an array: 1,2,3 ,5,8,7,6,9,5,7,3,0,5
subarry:5,7

Find the subarray in the large array and return the minimum length and index where you can find the subarray. Note: that the subarray may be present in the large array non-contiguous.

In the above case : the answer is length = 2 and
index = 8

An unsorted array is given . Find the no of greater elements on right side on current element in array. Find this for every element of array Expected time complexity is lesser then O(n^2)

A monotonically increasing function F(X) exists. For a given no N , find the value of X when F(X) = N.

Given a random function with equal probability of getting 1 or 0 ie 50% each. write a custom function which uses the above random function such that your function should return 1 with 75% probability and 0 with 25% probability