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512,316 softwareentwickler backend interview questions shared by candidates

Puzzle1 - Given 8 coins, and the fact that one of the coins is heavier than the other, how many times(min) do you need to use a beam balance to figure out which is the anomalous coin? After I answered this, he made it little tougher. Given 9 coins and one anomalous coin(maybe heavier or lighter), figure out which coin it is and whether heavier or lighter. What is the min no of comparisons? This is where i took a while to answer.
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Financial Software Developer

Interviewed at Bloomberg

4★
Nov 16, 2010

Puzzle1 - Given 8 coins, and the fact that one of the coins is heavier than the other, how many times(min) do you need to use a beam balance to figure out which is the anomalous coin? After I answered this, he made it little tougher. Given 9 coins and one anomalous coin(maybe heavier or lighter), figure out which coin it is and whether heavier or lighter. What is the min no of comparisons? This is where i took a while to answer.

given an arrya of numbers see if you can get to index with 0 in it from an index by jumping through the array using the values in the array. So if you have [1,2,1,0,3] you can get to 0, from 0 by jumping 0, you can get to 0 from 3, by jumping 3 index down to 2 and then jumping 2 index up to 0...
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Software Engineer

Interviewed at Pinterest

3.6★
Nov 19, 2012

given an arrya of numbers see if you can get to index with 0 in it from an index by jumping through the array using the values in the array. So if you have [1,2,1,0,3] you can get to 0, from 0 by jumping 0, you can get to 0 from 3, by jumping 3 index down to 2 and then jumping 2 index up to 0...

Given a binary tree, which is not necessarily balanced, print the nodes in the tree in a level-wise manner. Also, nodes on the same level should be printed on a single line. A modification of the question was added later in which I cannot really add a "level" variable in the structure of the node in the tree.
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Software Engineer Intern

Interviewed at Meta

3.6★
Aug 13, 2013

Given a binary tree, which is not necessarily balanced, print the nodes in the tree in a level-wise manner. Also, nodes on the same level should be printed on a single line. A modification of the question was added later in which I cannot really add a "level" variable in the structure of the node in the tree.

Implement a method called printNonComments() which prints out a extract of text with comments removed. For example, the input: hello /* this is a multi line comment */ all Should produce: hello all You have access to a method called getNextLine() which returns the next line in the input string.
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Senior Software Engineer

Interviewed at Meta

3.6★
Jun 30, 2014

Implement a method called printNonComments() which prints out a extract of text with comments removed. For example, the input: hello /* this is a multi line comment */ all Should produce: hello all You have access to a method called getNextLine() which returns the next line in the input string.

1. Tell me about yourself 2. Given each abc letter has a value (a=1, b=2, ... , z=26), compute the number of ways one can decode a given integer. e.g. 23 --> 2 [ 2, 3 ; 23 ], 456 --> 1 [ 4, 5, 6 ], 123 --> 3 [ 1, 2, 3 ; 1, 23 ; 12, 3 ]
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Software Engineer

Interviewed at Meta

3.6★
Feb 23, 2015

1. Tell me about yourself 2. Given each abc letter has a value (a=1, b=2, ... , z=26), compute the number of ways one can decode a given integer. e.g. 23 --> 2 [ 2, 3 ; 23 ], 456 --> 1 [ 4, 5, 6 ], 123 --> 3 [ 1, 2, 3 ; 1, 23 ; 12, 3 ]

(Phone screen questions) 1. For a given binary tree, print paths from root to all leaf nodes, one path per line. 2. Given a sequence of positive integers "seq" and an integer "total", return whether a contiguous sequence of "seq" sums up to "total". (Onsite interview questions are covered by NDA therefore can't post, but it can be said that the knowledge of data structures and handling edge cases are important for the coding interviews)
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Software Engineer

Interviewed at Meta

3.6★
Apr 1, 2019

(Phone screen questions) 1. For a given binary tree, print paths from root to all leaf nodes, one path per line. 2. Given a sequence of positive integers "seq" and an integer "total", return whether a contiguous sequence of "seq" sums up to "total". (Onsite interview questions are covered by NDA therefore can't post, but it can be said that the knowledge of data structures and handling edge cases are important for the coding interviews)

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