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LeetCode problem 150. Evaluate Reverse Polish Notation [ 30 Jan 2024 ]

🔗 Resources & Links:

📌 Video Overview:
Dive deep into the solution for the LeetCode challenge titled '150. Evaluate Reverse Polish Notation'. Whether you're kickstarting your coding journey or aiming for roles at tech giants like Facebook, Amazon, Apple, Netflix, or Google, this tutorial is tailored for you. We'll break down the problem step-by-step, ensuring clarity and understanding.

🌟 Key Highlights:

A comprehensive walkthrough of the problem statement.
An intuitive explanation for both novice and intermediate coders.
Practical insights for acing interviews with top tech companies.
Code walkthrough to grasp the algorithmic approach.

📌 Chapters:
00:00 Problem Statement
01:49 Approach - Stack
05:51 Time Complexity
06:02 Code - O(N) Time - Stack

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Join me on this coding adventure! Let's learn, grow, and conquer challenges together.

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Problem Statement :

You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation.

Evaluate the expression. Return an integer that represents the value of the expression.

Note that:

The valid operators are '+', '-', '*', and '/'.
Each operand may be an integer or another expression.
The division between two integers always truncates toward zero.
There will not be any division by zero.
The input represents a valid arithmetic expression in a reverse polish notation.
The answer and all the intermediate calculations can be represented in a 32-bit integer.

Example 1:

Input: tokens = ["2","1","+","3","*"]
Output: 9
Explanation: ((2 + 1) * 3) = 9