| 1 | package game_of_life_289 |
| 2 | |
| 3 | func gameOfLife(board [][]int) { |
| 4 | for r := 0; r < len(board); r++ { |
| 5 | for c := 0; c < len(board[r]); c++ { |
| 6 | cs := board[r][c] |
| 7 | liveNeighbors := getLiveNeighbors(board, r, c, len(board), len(board[r])) |
| 8 | |
| 9 | if cs == 0 && liveNeighbors == 3 { |
| 10 | // Rule 4: Was a 0 (dead) and going to 1 (alive) |
| 11 | board[r][c] = -2 |
| 12 | } else if cs == 1 && (liveNeighbors < 2 || liveNeighbors > 3) { |
| 13 | // Rule 1,3: Was a 1 (live) and going to 0 (dead) |
| 14 | board[r][c] = -1 |
| 15 | } |
| 16 | } |
| 17 | } |
| 18 | |
| 19 | // Swap -1 (1 -> 0) and -2 (0 -> 1) in place |
| 20 | for r := 0; r < len(board); r++ { |
| 21 | for c := 0; c < len(board[r]); c++ { |
| 22 | if board[r][c] == -1 { |
| 23 | board[r][c] = 0 |
| 24 | } else if board[r][c] == -2 { |
| 25 | board[r][c] = 1 |
| 26 | } |
| 27 | } |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | func getLiveNeighbors(board [][]int, r, c, rows, cols int) int { |
| 32 | cnt := 0 |