1926. Nearest Exit from Entrance in Maze: RETRY

Author: tan-wei

src/solution/mod.rs

@@ -1451,3 +1451,4 @@ mod s1921_eliminate_maximum_number_of_monsters;
 mod s1922_count_good_numbers;
 mod s1923_longest_common_subpath;
 mod s1925_count_square_sum_triples;
+mod s1926_nearest_exit_from_entrance_in_maze;

src/solution/s1926_nearest_exit_from_entrance_in_maze.rs

@@ -0,0 +1,103 @@
+/**
+ * [1926] Nearest Exit from Entrance in Maze
+ *
+ * You are given an m x n matrix maze (0-indexed) with empty cells (represented as '.') and walls (represented as '+'). You are also given the entrance of the maze, where entrance = [entrancerow, entrancecol] denotes the row and column of the cell you are initially standing at.
+ * In one step, you can move one cell up, down, left, or right. You cannot step into a cell with a wall, and you cannot step outside the maze. Your goal is to find the nearest exit from the entrance. An exit is defined as an empty cell that is at the border of the maze. The entrance does not count as an exit.
+ * Return the number of steps in the shortest path from the entrance to the nearest exit, or -1 if no such path exists.
+ *  
+ * Example 1:
+ * <img alt="" src="https://assets.leetcode.com/uploads/2021/06/04/nearest1-grid.jpg" style="width: 333px; height: 253px;" />
+ * Input: maze = [["+","+",".","+"],[".",".",".","+"],["+","+","+","."]], entrance = [1,2]
+ * Output: 1
+ * Explanation: There are 3 exits in this maze at [1,0], [0,2], and [2,3].
+ * Initially, you are at the entrance cell [1,2].
+ * - You can reach [1,0] by moving 2 steps left.
+ * - You can reach [0,2] by moving 1 step up.
+ * It is impossible to reach [2,3] from the entrance.
+ * Thus, the nearest exit is [0,2], which is 1 step away.
+ *
+ * Example 2:
+ * <img alt="" src="https://assets.leetcode.com/uploads/2021/06/04/nearesr2-grid.jpg" style="width: 253px; height: 253px;" />
+ * Input: maze = [["+","+","+"],[".",".","."],["+","+","+"]], entrance = [1,0]
+ * Output: 2
+ * Explanation: There is 1 exit in this maze at [1,2].
+ * [1,0] does not count as an exit since it is the entrance cell.
+ * Initially, you are at the entrance cell [1,0].
+ * - You can reach [1,2] by moving 2 steps right.
+ * Thus, the nearest exit is [1,2], which is 2 steps away.
+ *
+ * Example 3:
+ * <img alt="" src="https://assets.leetcode.com/uploads/2021/06/04/nearest3-grid.jpg" style="width: 173px; height: 93px;" />
+ * Input: maze = [[".","+"]], entrance = [0,0]
+ * Output: -1
+ * Explanation: There are no exits in this maze.
+ *
+ *  
+ * Constraints:
+ *
+ * 	maze.length == m
+ * 	maze[i].length == n
+ * 	1 <= m, n <= 100
+ * 	maze[i][j] is either '.' or '+'.
+ * 	entrance.length == 2
+ * 	0 <= entrancerow < m
+ * 	0 <= entrancecol < n
+ * 	entrance will always be an empty cell.
+ *
+ */
+pub struct Solution {}
+
+// problem: https://leetcode.com/problems/nearest-exit-from-entrance-in-maze/
+// discuss: https://leetcode.com/problems/nearest-exit-from-entrance-in-maze/discuss/?currentPage=1&orderBy=most_votes&query=
+
+// submission codes start here
+
+impl Solution {
+    pub fn nearest_exit(maze: Vec<Vec<char>>, entrance: Vec<i32>) -> i32 {
+        0
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    #[ignore]
+    fn test_1926_example_1() {
+        let maze = vec![
+            vec!['+', '+', '.', '+'],
+            vec!['.', '.', '.', '+'],
+            vec!['+', '+', '+', '.'],
+        ];
+        let entrance = vec![1, 2];
+
+        let result = 1;
+
+        assert_eq!(Solution::nearest_exit(maze, entrance), result);
+    }
+
+    #[test]
+    #[ignore]
+    fn test_1926_example_2() {
+        let maze = vec![vec!['+', '+', '+'], vec!['.', '.', '.'], ['+', '+', '+']];
+        let entrance = vec![1, 0];
+
+        let result = 2;
+
+        assert_eq!(Solution::nearest_exit(maze, entrance), result);
+    }
+
+    #[test]
+    #[ignore]
+    fn test_1926_example_3() {
+        let maze = vec![vec!['.'], vec!['+']];
+        let entrance = vec![0, 0];
+
+        let result = -1;
+
+        assert_eq!(Solution::nearest_exit(maze, entrance), result);
+    }
+}