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Grokking the Coding Interview Patterns in Go

Solution: Word Search

Explore the implementation of a backtracking algorithm to solve the Word Search problem in a character grid. Learn how depth-first search checks sequential neighbors, manages visited cells, and backtracks when paths fail. Understand the time and space complexities involved while efficiently finding if a word exists by connecting adjacent letters in the grid.

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Statement

Given an m x n grid of characters, board, and a string word, return TRUE if word exists in the grid.

The word can be formed by connecting letters of sequentially adjacent cells. The cells are considered sequentially adjacent when neighbors are either horizontally or vertically neighbors. Each cell can be used only once while forming the word.

Constraints:

  • m ==== board.length

  • n == board[i].length, where 0≤0 \leq i << m

  • ...