Parsing

2 articles

dsa8 min read

Basic Calculator II — Stack-Based Expression Evaluation with Precedence

Solve LeetCode 227 Basic Calculator II using a stack to handle operator precedence for plus, minus, multiplication, and division. A FAANG interview classic at Google, Amazon, Meta, and Uber.

March 19, 2026Read →

dsa8 min read

Basic Calculator — Stack-Based Expression Parsing with Parentheses

Solve LeetCode 224 Basic Calculator with a single-pass stack approach handling +, -, parentheses, and arbitrary whitespace in O(n). A FAANG hard parsing classic.

March 19, 2026Read →