题目：

题解：

class Solution {public int uniquePathsWithObstacles(int[][] obstacleGrid) {int n = obstacleGrid.length, m = obstacleGrid[0].length;int[] f = new int[m];f[0] = obstacleGrid[0][0] == 0 ? 1 : 0;for (int i = 0; i < n; ++i) {for (int j = 0; j < m; ++j) {if (obstacleGrid[i][j] == 1) {f[j] = 0;continue;}if (j - 1 >= 0 && obstacleGrid[i][j - 1] == 0) {f[j] += f[j - 1];}}}return f[m - 1];}
}