https://leetcode.com/problems/maximum-number-of-moves-in-a-grid

medium/maximum_number_of_moves_in_a_grid.py

@@ -0,0 +1,28 @@
+# https://leetcode.com/problems/maximum-number-of-moves-in-a-grid
+from typing import List
+
+DIRS =  [[-1, 1], [0, 1], [1, 1]]
+class Solution:
+    def maxMoves(self, grid: List[List[int]]) -> int:
+        memo = [[-1] * len(l) for l in grid]
+        def recurse(y, x, curr: int) -> int:
+            ret = curr
+            if memo[y][x] != -1:
+                return memo[y][x]
+            for [new_y, new_x] in DIRS:
+                new_y += y
+                new_x += x
+                if new_y >= len(grid) or \
+                    new_y < 0 or \
+                    new_x >= len(grid[0]) or \
+                    new_x < 0 or \
+                    grid[new_y][new_x] <= grid[y][x]:
+                    continue
+                ret = max(ret, recurse(new_y, new_x, curr + 1))
+            memo[y][x] = ret
+            return ret
+        ret = 0
+        for y in range(len(grid)):
+            ret = max(ret, recurse(y, 0, 0))
+        return ret
+