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word search in python
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| #!/usr/bin/env python3 | |
| # vim:sw=4:ts=4:et: | |
| # | |
| # based on https://www.tutorialspoint.com/word-search-in-python | |
| BOARD = [ | |
| ['A', 'B', 'C', 'E'], | |
| ['S', 'F', 'R', 'S'], | |
| ['A', 'D', 'E', 'E'], | |
| ['T', 'I', 'G', 'R'], | |
| ] | |
| class Solution(object): | |
| def exist(self, board, word, res_board=None): | |
| n = len(board) | |
| m = len(board[0]) | |
| for i in range(n): | |
| for j in range(m): | |
| if word[0] == board[i][j]: | |
| if self.find(board, word, i, j, res_board=res_board): | |
| return True | |
| return False | |
| def find(self, board, word, row, col, i=0, res_board=None): | |
| #print(f'find called: word={word} row={row} col={col} i={i}') | |
| if i == len(word): | |
| return True | |
| if row >= len(board) or row < 0 or col >= len(board[0]) or col < 0 or word[i] != board[row][col]: | |
| return False | |
| board[row][col] = '*' | |
| res = ( | |
| self.find(board, word, row+1, col, i+1, res_board=res_board) or | |
| self.find(board, word, row-1, col, i+1, res_board=res_board) or | |
| self.find(board, word, row, col+1, i+1, res_board=res_board) or | |
| self.find(board, word, row, col-1, i+1, res_board=res_board) | |
| ) | |
| board[row][col] = word[i] | |
| if res and res_board: | |
| res_board[row][col] = word[i] | |
| return res | |
| def print_board(self, board): | |
| for row in board: | |
| print(' '.join(row)) | |
| def empty_board_from(self, board): | |
| res = [] | |
| num_rows = len(board) | |
| num_cols = len(board[0]) | |
| for i in range(num_rows): | |
| res.append([]) | |
| for j in range(num_cols): | |
| res[i].append('.') | |
| return(res) | |
| if __name__ == '__main__': | |
| ws = Solution() | |
| print('Source board:') | |
| ws.print_board(BOARD) | |
| for word in ('SEE', 'CAT', 'TIGR', 'TIGER', 'ERDT', 'AFER'): | |
| empty_board = ws.empty_board_from(BOARD) | |
| rc = ws.exist(BOARD, word, res_board=empty_board) | |
| print(f'Searching for {word}: {rc}') | |
| if rc: | |
| ws.print_board(empty_board) |
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