Leetcode Problem 425. Word Squares

425. Word Squares

Leetcode Solutions

Build a Trie from the list of words, where each node contains a character and a list of word indices that pass through this node.
Start backtracking, attempting to build a word square row by row.
For each row, determine the prefix that the next word must match. This prefix is derived from the current state of the word square.
Query the Trie for all words that start with the current prefix.
For each word that matches the prefix, add it to the current word square and proceed to the next row.
If a word square of the required size is constructed, add it to the list of solutions.
If no word can be found that satisfies the prefix requirement, backtrack to the previous row and try a different word.
Repeat steps 3-7 until all possible word squares are found.

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