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In our previous lesson, we saw one simple application of stack we saw that stack can be used to reverse a list or collection or may be to simply traverse a list or collection in reverse order. In this lesson, we will discuss another famous problem that can be solved using stack. And this is also a popular programming interview question and the problem is, given an expression in the form of a string comprising of lets say constants,variables, operators and parenthesis and when I say parenthesis I also want to include curly braces and brackets and my definition of parenthesis. so my expression or string can contain characters that can be upper or lower case letters, symbols for operators and an opening or closing parenthesis or an opening or closing curly brace on an opening or closing square bracket. Lets write down some expressions here. Im going to write a simple expression. We have one simple expression with one pair of opening and closing parenthesis. Here in this expression we
