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Practice Basic Calculator II

Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.

Medium#227
LeetCode Problem

Basic Calculator II

MathStringStack

Problem Statement

Given a string s which represents an expression, evaluate this expression and return its value. The integer division should truncate toward zero. You may assume that the given expression is always valid. All intermediate results will be in the range of [-2^31, 2^31 - 1]. Note: You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as eval().

Source: Basic Calculator II on LeetCode. Use the original task for its coding environment and submissions.

Examples

# Example 1

Input
s = "3+2*2"
Output
7

# Example 2

Input
s = " 3/2 "
Output
1

# Example 3

Input
s = " 3+5 / 2 "
Output
5

Constraints

1 <= s.length <= 3 * 10^5
s consists of integers and operators ('+', '-', '*', '/') separated by some number of spaces.
s represents a valid expression.
All the integers in the expression are non-negative integers in the range [0, 2^31 - 1].
The answer is guaranteed to fit in a 32-bit integer.

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