Write a function that checks if a number's divisors sum up to that number, i.e. whether it's a perfect number or not.
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You are given two buckets. One holds 3 gallons and the other holds 5 gallons. Have do you make 4 gallons of water?
how much memory is int[3000][3000] in bytes and then in MB's. should this size of memory be allocated or static?
Longest palindrome in a string.
How to save resources' IDs used by an activity and access them in O(1), assuming there could be an infinite number of resources?
Hardest question was how to sort a linked list using recursion only. I knew the iterative solution but couldn't come up with recursion. Very difficult.
Clone a linked list that has a cycle (do not fix the cycle). Is there a way to uniquely identify a node without relying on a hash code?
Given an int array and an int X, find out if two elements sum up to X
Display the first 3 character of a word(string)
given binary tree inorder & preorder traversal, return postorder traversal
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