题目：

题解：

func uniquePathsWithObstacles(obstacleGrid [][]int) int {n, m := len(obstacleGrid), len(obstacleGrid[0])f := make([]int, m)if obstacleGrid[0][0] == 0 {f[0] = 1}for i := 0; i < n; i++ {for j := 0; j < m; j++ {if obstacleGrid[i][j] == 1 {f[j] = 0continue}if j - 1 >= 0 && obstacleGrid[i][j-1] == 0 {f[j] += f[j-1]}}}return f[len(f)-1]
}