282. Expression Add Operators
https://leetcode.com/problems/expression-add-operators/
Given a string that contains only digits 0-9 and a target value, return all possibilities to add binary operators (not unary) +, -, or * between the digits so they evaluate to the target value.
Example 1:
Input: num = "123", target = 6
Output: ["1+2+3", "1*2*3"]
Example 2:
Input: num = "232", target = 8
Output: ["2*3+2", "2+3*2"]Example 3:
Input: num = "105", target = 5
Output: ["1*0+5","10-5"]Example 4:
Input: num = "00", target = 0
Output: ["0+0", "0-0", "0*0"]
Example 5:
Input: num = "3456237490", target = 9191
Output: []
--- Clarifying questions
Can target overflow integer range
Can we assume operators are to be single digits only, not combination of more than one digit
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