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Basic Calculator II

**Problem Statement:** Given the required input arguments, write an efficient algorithm to solve the **Basic Calculator II** problem. Implement the required logic as specified by standard definitions for this classic algorithmic challenge. **Hint / Expected Approach:** Sign-aware stack with +/−/× /÷ precedence **Edge Cases to Consider:** - (1) Expression with only one number - (2) Division truncating to zero - (3) Leading/trailing spaces

Examples

Example 1
Input: "3+2*2"
Output: 7
Explanation: Precedence
Example 2
Input: " 3/2 "
Output: 1
Explanation: Spaces, truncation
Example 3
Input: " 3+5 / 2 "
Output: 5
Explanation: 3+2=5

Constraints

  • ▪Input arguments are within valid ranges
  • ▪Optimize for execution speed
  • ▪Handle null/empty inputs gracefully

Watch Out For Edge Cases

  • ▪Expression with only one number
  • ▪Division truncating to zero
  • ▪Leading/trailing spaces
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