| 1 | ||
| 2 | 1 | class Board: |
| 3 | 2 | """Count territories of each player in a Go game |
| 4 | 3 | |
| 7 | 6 | """ |
| 8 | 7 | |
| 9 | 8 | def __init__(self, board: list[str]): |
| 10 | pass | |
| 9 | self.board = board | |
| 10 | self.rows = len(board) | |
| 11 | if self.rows > 0: | |
| 12 | self.cols = len(board[0]) | |
| 13 | else: | |
| 14 | self.cols = 0 | |
| 11 | 15 | |
| 12 | 16 | def territory(self, x: int, y: int) -> tuple[str, set[tuple[int, int]]]: |
| 13 | 17 | """Find the owner and the territories given a coordinate on |
| 23 | 27 | second being a set of coordinates, representing |
| 24 | 28 | the owner's territories. |
| 25 | 29 | """ |
| 26 | pass | |
| 30 | # Edge Case: Invalid coordinates (negative) | |
| 31 | if x < 0 or y < 0: | |
| 32 | raise ValueError('Invalid coordinate') | |
| 33 | ||
| 34 | # Edge Case: Invalid coordinates (out of bounds) | |
| 35 | if x >= self.cols or y >= self.rows: | |
| 36 | raise ValueError('Invalid coordinate') | |
| 37 | ||
| 38 | # Edge Case: Coordinate is not empty | |
| 39 | if self.board[y][x] != ' ': | |
| 40 | return ('', set()) | |
| 41 | ||
| 42 | visited = set() | |
| 43 | territory_coords = set() | |
| 44 | owners = set() | |
| 45 | ||
| 46 | def dfs(cx, cy): | |
| 47 | # Edge Case: Out of bounds or already visited | |
| 48 | if (cx < 0 or cx >= self.cols or | |
| 49 | cy < 0 or cy >= self.rows or | |
| 50 | (cx, cy) in visited): | |
| 51 | return | |
| 52 | ||
| 53 | # Edge Case: Encountered a stone | |
| 54 | if self.board[cy][cx] in 'BW': | |
| 55 | owners.add(self.board[cy][cx]) | |
| 56 | return | |
| 57 | ||
| 58 | # Edge Case: Encountered empty space | |
| 59 | if self.board[cy][cx] == ' ': | |
| 60 | visited.add((cx, cy)) | |
| 61 | territory_coords.add((cx, cy)) | |
| 62 | # Explore neighbors | |
| 63 | dfs(cx+1, cy) | |
| 64 | dfs(cx-1, cy) | |
| 65 | dfs(cx, cy+1) | |
| 66 | dfs(cx, cy-1) | |
| 67 | ||
| 68 | dfs(x, y) | |
| 69 | ||
| 70 | # Edge Case: Territory surrounded by one player | |
| 71 | if len(owners) == 1: | |
| 72 | return (list(owners)[0], territory_coords) | |
| 73 | ||
| 74 | # Edge Case: Territory surrounded by both players or none | |
| 75 | return ('', territory_coords) | |
| 27 | 76 | |
| 28 | 77 | def territories(self) -> dict[str, set[tuple[int, int]]]: |
| 29 | 78 | """Find the owners and the territories of the whole board |
| 36 | 85 | , i.e. "W", "B", "". The value being a set |
| 37 | 86 | of coordinates owned by the owner. |
| 38 | 87 | """ |
| 39 | pass | |
| 88 | result = {'B': set(), 'W': set(), '': set()} | |
| 89 | visited = set() | |
| 90 | ||
| 91 | # Edge Case: Empty board | |
| 92 | if self.rows == 0 or self.cols == 0: | |
| 93 | return result | |
| 94 | ||
| 95 | for y in range(self.rows): | |
| 96 | for x in range(self.cols): | |
| 97 | # Edge Case: Only process unvisited empty spaces | |
| 98 | if self.board[y][x] == ' ' and (x, y) not in visited: | |
| 99 | owner, territory_coords = self.territory(x, y) | |
| 100 | result[owner].update(territory_coords) | |
| 101 | visited.update(territory_coords) | |
| 102 | ||
| 103 | return result |
| Test Name | Status |
|---|---|
test_a_stone_and_not_a_territory_on_5x5_board | Pass |
test_black_corner_territory_on_5x5_board | Pass |
test_invalid_because_x_is_too_high_for_5x5_board | Pass |
test_invalid_because_x_is_too_low_for_5x5_board | Pass |
test_invalid_because_y_is_too_high_for_5x5_board | Pass |
test_invalid_because_y_is_too_low_for_5x5_board | Pass |
test_one_territory_is_the_whole_board | Pass |
test_open_corner_territory_on_5x5_board | Pass |
test_two_region_rectangular_board | Pass |
test_two_territory_rectangular_board | Pass |
test_white_center_territory_on_5x5_board | Pass |
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