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Number Puzzle #30

April 1, 2013 by puzzler 2 Comments

Find a pythagorean triplet from an array

March 28, 2013 by puzzler 1 Comment

Problem Statement: Given an array a of n integers find all possible Pythagorean triplets from the array. What is Pythagorean triplet? A Pythagorean triple consists of three positive integers a, b, and c, such that a2 + b2 = c2. this formula is … [Continue reading]

Number Puzzle #29

March 28, 2013 by puzzler 1 Comment

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Number Puzzle #28

March 28, 2013 by puzzler 12 Comments

IF 1+2 = 3 3 + 4 = 21 5 + 6 = 55 Then 4 + 5 = ?

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3 SUM problem

March 27, 2013 by puzzler Leave a Comment

Problem Statement: Given a set S of n integers find all possible subsets(a,b,c) such that a + b + c = 0. Solution: Brute force approach is of O(n^4) but we can solve it in O(n^2) by using the approach in Non duplicate pairs that sum to S. First … [Continue reading]