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Mobile Software Engineer Interview Questions

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given a matrix where the numbers ascend both in rows & columns, e.g. 1 3 5 7 9 11 13 15 18 20 22 24 26 28 30 31 33 36 38 39 42 44 47 49 50 If you're asked to write a function that provides a boolean (YES or NO) answer to "does this number exist in this matrix", explain how you would design an algorithm to be most optimal.

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I'm not 100% certain if that is the exact same style of matrix that was on the white board (I didn't scribble down my notes fast enough), so it may have been that some ascending numbers might be on the row above. E.G. 1 3 5 7 9 11 13 15 18 25 22 24 26 29 30 where 25 is on row 2 and 22 is on row 3. After some hand wringing and a bit of stress, the questioner dropped a hint that I could look at the beginning and end of a row and rule it out immediately if the beginning and end didn't have the desired number in range. I'm guessing they wanted a much more specific answer than this though, along with big / little O complexity time.

Start from the right-top. Keep going left till our number is greater than the number at [row,col]. Once this col is found, increment the row and move down, Repeat until found.

If one has a collection of N stock options vesting over P periods, describe algorithmically how one would come up with the data for a table listing how many options are awarded per period.

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What's the angle between the hands of a clock if the time is 3:15.

3 Answers

How does the retain/release process work in Objective C?

1 Answer

What is the relationship between C and Objective C?

1 Answer

Design a stack implementation that has "push", "pop" and "peek" functions (look at the top-most value of the stack without popping it off the stack), and then design a function that tells the caller what the "minimum" value in the stack will be.

1 Answer

How to implement xxx feature ? (they will ask you a question from the current system they have)

1 Answer

Here's the one "bigger" question I was asked by the hiring manager on-site: Given an array of strings, e.g.: NSArray * files = @"[@"file2", @"folder22", @"folder10", @"file1", @"folder100", … … …, nil]; Describe how you would write some kind of method or function that would sort the strings in a predictable manner (e.g. "file1", "file2", "folder2", "folder10", "folder100" instead of "folder10", "folder100", "folder2")

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Implement a LinkedList in your language of choice. For me, it was Objective C. So the hiring manager typed this into a shared whiteboard/document browser window: LList * list = [[LList alloc] init]; [list insert:10]; [list insert:20]; [list insert:5]; [list insert:30]; [list insert:12];

1 Answer

What are your salary expectations?

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