In a BST write a program to find 2 nodes x and y such that X+y=k
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Take a ladder with 5 steps, write a function that gives all the possible combinations of either 1,2, or 3 steps, in any order, to get to the 5th step, and returns the total number of combinations. So some of the possibilities would be [1,1,1,1,1], [1,1,1,2], [1,1,2,1], etc. Then he asked the same question with order not being considered, so [1,1,1,2] and [1,1,2,1] are the same solution.
Reverse an integer. Looking for optimized solution and definitely no tostring type of solution
1. Reverse string except spaces. A string has mix of alphabets and spaces. Your task is to reverse the string, but preserve the positions of spaces. For example, reverse of " a if" is " f ia" 2. An array of size n has all but one numbers between 1 and n+1. Find the missing one.
Find the character with longest repitition in the string e.g. aaacccddddeefffffffg the result should be 'f'.
Write a function to find the maximum sum of sub array where the array can have negative and positive numbers.
find duplicated item from an array, output the duplicated item with their times
what was a technical difficulty and how have you overcome it.
Given an array of items of three different colors red, green, blue. How would you sort the items in the array so that all the items with a certain color would be grouped together.
Print a binary tree level by level in zigzag order
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