array of +ve nums, find pairs that add up to a given value
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find common ancestor in binary tree
String manipulation related questions were asked
Write code to reverse a linked list from its mid point. So 1->2->3->4->5->6->7 becomes 1->2->3->7->6->5->4
Implement atoi()
Asked question: Using an already implemented method Rand5() that generates a random integer between the ranges 1-5 uniformly. Using this method, implement a a new method that returns a random integer in the range 1-7 uniformly, i.e. Rand7(). Basically this is Rejection Sampling Algorithm. See http://leetcode.com/2010/11/rejection-sampling.html
Tree Data Structure
Program: Let's say U1,U2 are friends and vice versa. So given a list of friends, you need to find unique set of friends. For eg: U1,U2 U2,U3 U4,U5, U2,U1, U4,U5 Should return: U1,U2; U2,U3; U4,U5
How will you find two strings are anagram?
Puzzle
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