Pergunta de entrevista da empresa Overleap

Problem Description: Given a string s representing a basic mathematical expression with non-negative integers and operators (+, -, *, /), evaluate the expression following the standard operator precedence: Multiplication (*) and Division (/) have higher precedence than Addition (+) and Subtraction (-). Division is integer division (truncate towards zero). No parentheses are included. Example: Input: "3+7*7-9/3" Output: 49