Valid Parentheses: Given a string having some brackets, determine if the input string is valid.
Design how to recover a binary tree
OOP questions and multi-thread problems
Given a set of candidate numbers and a target number, determine whether there's a combination in C where the candidate numbers sums to the target number or not.

Question

Valid Parentheses: Given a string having some brackets, determine if the input string is valid. 
Design how to recover a binary tree
OOP questions and multi-thread problems
Given a set of candidate numbers and a target number, determine whether there's a combination in C where the candidate numbers sums to the target number or not.

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