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Solution: Number of Pairs of Strings With Concatenation Equal to Target
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Problem Statement

You are given a list called nums where each item is a string made up of digits. You're also given a target string, also made of digits. Count how many different pairs of indices (i, j) exist such that:

  • i is not equal to j, and
  • when you join nums[i] + nums[j], it forms exactly the target string.

Return the total number of such valid pairs.

Examples

Example 1

  • Input: nums = ["4", "44", "444"], target = "4444"
  • Expected Output: 2
  • Explanation:
    Valid pairs:
    • (0,2) → "4" + "444" = "4444"

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