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g0201_0300.s0227_basic_calculator_ii.readme.md Maven / Gradle / Ivy

227\. Basic Calculator II

Medium

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 [-231, 231 - 1].

**Note:** You are not allowed to use any built-in function which evaluates strings as mathematical expressions, such as `eval()`.

**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 * 105
*   `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, 231 - 1].
*   The answer is **guaranteed** to fit in a **32-bit integer**.