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Grokking the Coding Interview Patterns in C#

Solution: Word Search II

Explore how to use Trie data structures combined with backtracking to find multiple words in a 2D letter grid efficiently. Understand the implementation details, including depth-first search and prefix matching, and analyze the time and space complexity of this approach to improve your problem-solving skills in coding interviews.

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Statement

You are given a list of strings that you need to find in a 2D grid of letters such that the string can be constructed from letters in sequentially adjacent cells. The cells are considered sequentially adjacent when they are neighbors to each other either horizontally or vertically. The solution should return a list containing the strings from the input list that were found in the grid.

Constraints:

  • 1≤1 \leq rows, columns ≤12\leq 12
  • 1≤1 \leq words.length ≤3×
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