Sum of All Values

Fulltimeflexport

Problem Overview

  • Given a digit string, insert '+' between characters (no adjacent '+') to form all possible expressions and compute the sum of their values.
  • Input: string num of digits; Output: integer equal to the total sum modulo 1e9+7.
  • Constraints are unspecified; result may be large, so modulus is required.
  • Context: a school scholarship exam in HackerLand focusing on addition expressions.
  • A Flexport interviews coding interview problem and common interview question.

Example

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Input Variables
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