92 - Target Sum - Definition

@Rishi Srivastava You are given an integer array nums and an integer target. You want to build an expression out of nums by adding one of the symbols ’ ’ and ’-’ before each integer in nums and then concatenate all the integers. For example, if nums = [2, 1], you can add a ’ ’ before 2 and a ’-’ before 1 and concatenate them to build the expression “ 2-1“. Return the number of different expressions that you can build, which evaluates to target. Example: Input: nums = [1,1,1,1,1], target = 3 Output: 5 Explanation: There are 5 ways to assign symbols to make the sum of nums be target 3. -1 1 1 1 1 = 3 1 - 1 1 1 1 = 3 1 1 - 1 1 1 = 3 1 1 1 - 1 1 = 3 1 1 1 1 - 1 = 3 Leetcode: