Expression Add Operators to Reach Target

meta Given a string num that contains only digits and an integer target, return all possibilities for inserting the binary operators +, -, and * between the digits in num such that the expressions evaluate to the target value. Do not include leading zeros in the expressions. Input: num: A string containing only digits target: An integer Output: A list of valid expressions that evaluate to the target value Example: Input: num = "123", target = 6 Output: ["1+2+3", "1*2*3"] Constraints: 1 <= num.length <= 10 num contains only digits -2^31 <= target <= 2^31 - 1 Example Input num = "123", target = 6