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g0001_0100.s0063_unique_paths_ii.readme.md Maven / Gradle / Ivy

63\. Unique Paths II

Medium

You are given an `m x n` integer array `grid`. There is a robot initially located at the **top-left corner** (i.e., `grid[0][0]`). The robot tries to move to the **bottom-right corner** (i.e., `grid[m-1][n-1]`). The robot can only move either down or right at any point in time.

An obstacle and space are marked as `1` or `0` respectively in `grid`. A path that the robot takes cannot include **any** square that is an obstacle.

Return _the number of possible unique paths that the robot can take to reach the bottom-right corner_.

The testcases are generated so that the answer will be less than or equal to 2 * 109.

**Example 1:**

![](https://assets.leetcode.com/uploads/2020/11/04/robot1.jpg)

**Input:** obstacleGrid = [[0,0,0],[0,1,0],[0,0,0]]

**Output:** 2

**Explanation:** There is one obstacle in the middle of the 3x3 grid above. 

There are two ways to reach the bottom-right corner: 

1. Right -> Right -> Down -> Down 

2. Down -> Down -> Right -> Right

**Example 2:**

![](https://assets.leetcode.com/uploads/2020/11/04/robot2.jpg)

**Input:** obstacleGrid = [[0,1],[0,0]]

**Output:** 1

**Constraints:**

*   `m == obstacleGrid.length`
*   `n == obstacleGrid[i].length`
*   `1 <= m, n <= 100`
*   `obstacleGrid[i][j]` is `0` or `1`.