Follow up for “Unique Paths”:
Now consider if some obstacles are added to the grids. How many unique paths would there be?
An obstacle and empty space is marked as
0respectively in the grid.
There is one obstacle in the middle of a 3×3 grid as illustrated below.
The total number of unique paths is
Note: m and n will be at most 100.
- Similar to Unique Path except that we need to decide whether a position has obstacle or not
- If yes, the number of ways to it is 0