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Author: assassint2017

Unique Paths II/Unique_Paths_II.py

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+# 动态规划
+# 36ms 99.37%
+class Solution:
+    def uniquePathsWithObstacles(self, obstacleGrid):
+        """
+        :type obstacleGrid: List[List[int]]
+        :rtype: int
+        """
+        m, n = len(obstacleGrid), len(obstacleGrid[0])
+        if m is 0 or n is 0 or obstacleGrid[0][0] is 1:
+            return 0
+
+        score = [[0 for j in range(n)] for i in range(m)]
+        for i in range(1, m):
+            if 1 in [row[0] for row in obstacleGrid[:i + 1]]:
+                score[i][0] = 0
+            else:
+                score[i][0] = 1
+        for j in range(n):
+            if 1 in obstacleGrid[0][:j + 1]:
+                score[0][j] = 0
+            else:
+                score[0][j] = 1
+        for i in range(1, m):
+            for j in range(1, n):
+                if obstacleGrid[i][j] is 1:
+                    score[i][j] = 0
+                else:
+                    score[i][j] = score[i-1][j] + score[i][j-1]
+        return score[-1][-1]