Given an array, without using extra space, move all zeros to the end and no-zeros to the beginning. The function should return the number of non-zeros.
Lead Ios Engineer Interview Questions
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- Given an array, remove the duplicates and return a unique array keeping the first occurrence of the duplicates and the order. [@2, @1, @3, @1, @2] --> [@2, @1, @3] - how would you implement call for canceling queued blocks with dispatch_after?
Given nested arrays, write an enumerator class such that next() returns the elements in sequential order, e.g.: [1,[4,3],6,[5,[1,0]]] -> 1, 4, 3, 6, 5, 1, 0 also implement allObjects for this class
Take in an Int array and move all the zeroes to the end in place. It doesn’t matter how the non-zero numbers are ordered. Preferably as efficient and as space efficient as possible. Example: Input : [ 3, 0, 2, 0, 0, 4, 1, 0 ] Accepted Output: [ 4, 2, 3, 1, 0, 0, 0, 0 ]
If you have a program that runs slow, how will you improve it to run faster?
1. Given a 3 array like below NSArray *a = [1,3,4,5]; NSArray *b = [-1,3,0,9]; NSArray *c = [0,31,32,22,6]; Find the elements from the three array which existing in atleast 2 arrays. Eg: [3, 0] Because 3 is presented in array a, b and 0 is presented in array b, c respectively. -(NSArray)find2ElementsAtleastPresentIn2Arrays:(NSArray*)aList b::(NSArray*)bList c::(NSArray*)cList{ // -- your code here. }
One question 3 of the interviewers asked me was "What was the most difficult thing you had to deal with.".
They asked a lot of iOS questions, and some general programming questions. The first question they asked was so obscure that I didn't even really understand it. I was probably dead from that point on. Another question was to figure out a way to combine three lists of items where an item would be placed in a destination array if it existed in any two of the source arrays.
Write a function that determines which function is a mirror number. i.e. 12321 would return YES
The same list, back to inorder binary tree
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