Practice Target Sum
Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.
Problem Statement
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. Return the number of different expressions that you can build, which evaluates to target.
Source: Target Sum on LeetCode. Use the original task for its coding environment and submissions.
Examples
# Example 1
Input
nums = [1,1,1,1,1], target = 3
Output
5
# Example 2
Input
nums = [1], target = 1
Output
1
Constraints
1 <= nums.length <= 20
0 <= nums[i] <= 1000
0 <= sum(nums[i]) <= 1000
-1000 <= target <= 1000
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