20240504 Finished

src/problem/mod.rs

@@ -121,3 +121,4 @@ mod p36_valid_sudoku;
 mod p54_spiral_matrix;
 mod p48_rotate_image;
 mod p73_set_matrix_zeroes;
+mod p289_game_of_life;

src/problem/p289_game_of_life.rs

@@ -0,0 +1,73 @@
+/**
+ * [289] Game of Life
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn game_of_life(board: &mut Vec<Vec<i32>>) {
+        let m = board.len();
+        let n = board[0].len();
+
+        let directions = vec![(-1, -1), (0, -1), (1, -1), (1, 0), (1, 1), (0, 1), (-1, 1), (-1, 0)];
+
+        for i in 0..m {
+            for j in 0..n {
+                let mut count = 0;
+                
+                for (delta_x, delta_y) in directions.iter() {
+                    let x = i as i32 + *delta_x;
+                    let y = j as i32 + *delta_y;
+
+                    if x >= 0 && x < m as i32 && y >= 0 && y < n as i32 {
+                        let (x, y) = (x as usize, y as usize);
+
+                        // 本来就是活细胞或者刚死的活细胞
+                        if board[x][y] == 1 || board[x][y] == -1 {
+                            count += 1;
+                        }
+                    }
+                }
+
+                if board[i][j] == 1 {
+                    if count < 2 || count > 3 {
+                        // 死亡的活细胞
+                        board[i][j] = -1;
+                    }
+                }
+
+                if board[i][j] == 0 {
+                    if count == 3 {
+                        // 诞生的新细胞
+                        board[i][j] = 2;
+                    }
+                }
+            }
+        }
+
+        for i in 0..m {
+            for j in 0..n {
+                if board[i][j] == 2 {
+                    board[i][j] = 1;
+                }
+
+                if board[i][j] == -1 {
+                    board[i][j] = 0;
+                }
+            }
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_289() {
+    }
+}