Operators — Arithmetic Calculator

Implement solve(a, b, op) that performs the arithmetic operation specified by op on numbers a and b.

Supported operations:

• "+" → addition
• "-" → subtraction
• "*" → multiplication
• "/" → float division (raises ZeroDivisionError if b == 0)
• "//" → floor division
• "%" → modulus
• "**" → exponentiation

Raise ValueError("Unknown operator") for anything else.

Examples

• solve(5, 3, "+") → 8
• solve(5, 3, "**") → 125
• solve(7, 2, "//") → 3
• solve(5, 3, "?") → raises ValueError