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Imagine you have a string and you want to return False if there are repeat characters in this string, what are the fastest and most space efficient ways to do this. (I clarified and he only wanted to return False if there was a repeat letter or number)
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Software Development Engineer Intern

Interviewed at Microsoft

4★
Nov 7, 2014

Imagine you have a string and you want to return False if there are repeat characters in this string, what are the fastest and most space efficient ways to do this. (I clarified and he only wanted to return False if there was a repeat letter or number)

Implement the MyStack. (A lot of questions about multi-threading) @protocol Stack -(void)pushObject:(nonnull id)obj; -(nonnull id)popObjext; @property(nonatomic,assign)NSInteger count; @end @interface MyStack : NSObject <Stack> @end @implementation MyStack @end
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IOS Developer

Interviewed at Booking.com

4★
Aug 26, 2016

Implement the MyStack. (A lot of questions about multi-threading) @protocol Stack -(void)pushObject:(nonnull id)obj; -(nonnull id)popObjext; @property(nonatomic,assign)NSInteger count; @end @interface MyStack : NSObject <Stack> @end @implementation MyStack @end

(this is a little easier to explain if it's drawn out, but I'll try my best to do it here) Given some integer N = 2^k which represents an NxN matrix, write a function that fills the matrix with 'L' shapes, such that the entire matrix is filled except for 1 empty space. For example, a 2x2 matrix would have 3 spaces filled with one of the corners empty. And a 4x4 matrix would have the entire outer row of spaces filled, with the center 4 filled the same way the 2x2 matrix is filled.
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Android Developer

Interviewed at Vine

3.9★
Apr 19, 2016

(this is a little easier to explain if it's drawn out, but I'll try my best to do it here) Given some integer N = 2^k which represents an NxN matrix, write a function that fills the matrix with 'L' shapes, such that the entire matrix is filled except for 1 empty space. For example, a 2x2 matrix would have 3 spaces filled with one of the corners empty. And a 4x4 matrix would have the entire outer row of spaces filled, with the center 4 filled the same way the 2x2 matrix is filled.

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