Welcome to another coding tutorial! In this video, we'll delve into the fascinating world of LeetCode with problem 150: Evaluate Reverse Polish Notation. Whether you're a coding enthusiast or preparing for technical interviews, understanding and solving this problem is a must.
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Question Link
Leetcode:- leetcode.com/p...
In this video, I have solved the leetcode-150 problem named Evaluate Reverse Polish Notation.
In this question, the basic approach to solving this question is using stacks.
We solve it in three steps.
1. Iterate through the vector, accessing each element of the vector.
2. If the current element is an operand, then simply push it into the stack.
3. If the current element is an operator, then pop out the top two elements from the stack. The first element which gets poped out will be our operand-2 and the second element which gets poped out will be our operand-1
Now perform the operation based on the particular operator on these two operands, and whatever result you get, just simply push it back into the stack.
4. And finally, at last, when the loop gets over whatever value is remaining in the stack, the top is our answer.
TC: O(N) for traversing the vector.
SC: O(N) for taking extra space in the form of a stack.
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