Implement a data structure like a stack but with a way to find a max at O(1) time.
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What is the most appropiate DS to implement a T9 dictionary
Given two different strings, find the common characters between the two. For example if string A is "hello" and string B is "elbow" the common characters would be ['e', 'l', 'o']. Give a method that returns unique or duplicate entries.
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Generate all possible parenthesis for a given n
diagonally print a matrix
Write code in java to return a list of all the nodes at the greatest depth of a binary tree.
How to tell if a number is even or odd without using if else conditions
What's the difference between an abstract class and an interface.
Which is faster in c++: post-increment or pre-increment?
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