Mumbaiya_Chori
BAN USER
Data Scientist
- 1
3of 3 votes
AnswerYou want to go for a movie. You will select a day Sun-sat by flipping coins (You have infinite coins) such that the probability of selecting any day is always same.
- Mumbaiya_Chori in India
My answer: flip seven coins, select the coins which have heads if x coins are head, flip head coins. Follow this process until you just have one day left.
The interviewer confused me in this approach and made me believe I am wrong. But later he said that this method may work.
Also the answer he gave is flip 3 coins so outcome will be 2^3 you can discard all heads or alll tails| Report Duplicate | Flag | PURGE
Pubamatic - 12
1of 1 vote
AnswersImplement DFS
- Mumbaiya_Chori in India for Machine learning
After I implemented this, I was told to implement it without recursion. He told me to write pseudo code. I wrote it using stacks.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 6
1of 1 vote
AnswersGiven a matrix (0,0 is to the botto9m left like co-ordinate system)of 0s and 1s and two co-ordinates find if there is a path between them, Also you can only travel via 1s and you can only go up or right.
- Mumbaiya_Chori in India for Machine learning
Answer: Backtracking algorithm| Report Duplicate | Flag | PURGE
Amazon SDE1 - 3
0of 0 votes
Answersgiven K sorted arrays merge them
- Mumbaiya_Chori in India for Machine learning
Answer: Told him how to do using merge of merge sort. He wanted me to do another approach I googled later you can use min heap for it.| Report Duplicate | Flag | PURGE
Amazon SDE1 - 4
2of 2 votes
AnswersGiven an array of integers find the element for which the sum of left = sum of right. example -1 100 1 98 1 should return index of 1 i.e 2
Answer: First told him about Brute Force approach and then told him if we can iterate once and get the total sum
- Mumbaiya_Chori in India for Machine learningint findIndex(A){ int sum =0; for(int i =0;i<A.lenght;i++) { sum+= A[i]; } int lSum=0; for(int i=0;i<A.length;i++) { int rsum = sum - lsum-A[i]; if(lsum==rsum) return i; lsum += A[i]; } return -1; }| Report Duplicate | Flag | PURGE
Amazon SDE1 Algorithm - 5
-1of 1 vote
Answersyou have a sparse matrix with negative values almost 100 times the positive value. How will you retriev these negative values.
- Mumbaiya_Chori in India for Machine Learning
The interviewer was expecting something else other than just negative values.
He said look at it as a table where each seller has negative values for products he doesnt sell. He just wanted a subset of maybe all the negative values.| Report Duplicate | Flag | PURGE
Amazon - 5
1of 1 vote
AnswersYou are given a Matrix of 0's and 1's. An element at (i,j) is connected to another element at (i+-1, j+-1) if both of them are 1. Find the number of clusters formed by this.
- Mumbaiya_Chori in India for Machine learning
Answer: use dfs or bfs to traverse and then mark those positions with -1.| Report Duplicate | Flag | PURGE
Amazon
You can use 2 stacks one for numeric values and other for characters (operands). the calculations will be done using priority of the operands.
- Mumbaiya_Chori December 24, 2014It won't be euclidean distance it will be the distance along the sphere
- Mumbaiya_Chori December 03, 2014- 0
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it just clicked that may be the interviewer was expecting me to just talk about hashing used in databases
- Mumbaiya_Chori December 28, 2014