Challenge: Word Formation Using a Hash Table

Try to solve the Word Formation Using a Hash Table problem.

We'll cover the following


Given a list of words words_list, determine whether a given target can be formed by combining two words from the list in any order.


  • 2 \leq words_list.length 103\leq 10^3

  • 1 \leq words_list[i].length 20\leq 20

  • 2 \leq target.length 40\leq 40

  • All words consist of lowercase English letters


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