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Problem tl;dr: Given a string of digits   S , insert a minimum number of opening and closing parentheses into it such that the resulting...

Problem Vestigium means "trace" in Latin. In this problem we work with Latin squares and matrix traces. The   trace   of a s...

This article is based on how to be more productive while working from home. We have seen that all of the world gone into a lockdown situati...

There is a robot starting at position (0, 0), the origin, on a 2D plane. Given a sequence of its moves, judge if this robot  ends up at (0...

Given a balanced expression, find if it contains duplicate parenthesis or not. A set of parenthesis are duplicate if the same subexpression...

Given a Binary tree, print the maximum depth of a left node.( the node needs to be a left child ) (if the node is right child of the left c...

Given a binary tree, determine whether or not it is height-balanced. A height-balanced binary tree can be defined as one in which the heigh...