Given an array of numbers, return the longest substring in which the difference between every consecutive number pair varies difference in sign (I.e. +-+-)
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Implement a Sudoko puzzle validator - given a 9x9 matrix of numbers (1-9) and "." for empty spaces, return true for a valid puzzle matrix and false if it would not be a valid sudoku puzzle.
Q. Write a function that takes two trees as an argument and returns true if they are equal.
The problems are not hard.
Given a list of number from 1 to N. All of them written three times, except one number (written 1 or 2 times). Find the number
Given a file that represent a graph, write an algorithm that compute the number of triangles in the graph.
Input a string and output the number of words (need to run on coderpad)
Estimation question: Google employment has doubled each year for the last x years.. given the current employment, how many years before Google employs the entire world population of y.
Invert a Map e.g 1: {a,b} 2: {c,d} becomes a:1 b:1 c:2 d2
Given a list of numbers build and place the numbers into a sorted binary tree.
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