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20.Valid Parentheses Given a string containing just the characters'(',')','{','}','['and']', determine if the input string is valid. An input string is valid if: Open brackets must be close...

496.Next Greater Element I You are given two arrays(without duplicates)nums1andnums2wherenums1’s elements are subset ofnums2. Find all the next greater numbers fornums1's elements in the co...

682.Baseball Game You're now a baseball game point recorder. Given a list of strings, each string can be one of the 4 following types: Integer(one round's score): Directly represents the number o...

150.Evaluate Reverse Polish Notation Evaluate the value of an arithmetic expression inReverse Polish Notation. Valid operators are+,-,*,/. Each operand may be an integer or another expression....