/*
 * @lc app=leetcode id=63 lang=java
 *
 * [63] Unique Paths II
 */

// @lc code=start
class Solution {
    public int uniquePathsWithObstacles(int[][] obstacleGrid) {
        int[][] dp = new int[obstacleGrid.length][obstacleGrid[0].length];
        for(int i=0;i<dp.length;i++) {
            for(int j=0;j<dp[0].length;j++) {
                dp[i][j] = 0;
            }
        }
        dp[0][0] = obstacleGrid[0][0]==1?0:1;
        for(int i = 0; i<dp.length; i++) {
            for(int j=0; j<dp[0].length; j++) {
                if(obstacleGrid[i][j] == 1) {
                    continue;
                }
                if(i-1>=0) {
                    dp[i][j] += dp[i-1][j];
                }
                if(j-1>=0) {
                    dp[i][j] += dp[i][j-1];
                }
            }
        }
        return dp[dp.length-1][dp[0].length-1];
    }
}
// @lc code=end