iOS developers have a "dispatch_after(when, queue, block)" Grand Central Dispatch (GCD) function they can utilize but once it's set up, these calls can not be easily cancelled. Describe how you might implement a more convenient version of this named "cancellable_dispatch_after"
Python Questions - 1) Print Max element of a given list 2) Print median of a given list 3) Print the first nonrecurring element in a list 4) Print the most recurring element in a list 5) Greatest common Factor
Given many points, find k points that are closest to the origin.
Coding questions of good standard !
SQL Select the value of a column based on the max of a different column from each grouping of yet a third column. Column A, Column B, Column C. For each group based on Column A, give value of Column B, where Column C is max for that group.
Another question was: what's the difference between an abstract class and an interface. Can a class inherit both from an abstract class and an interface at the same time?
Give an array of Integer which contain duplicate number from 1-100, how to count how many distinct number you have?
Write a code to reverse binary bit pattern for an integer without using any string or utility methods?
How would you implement a top 3 word count in a text editor application?
Find nth last number in a singly linked list.
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