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leetcode63.java

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package leetcode;

/*

* 递归，遇见1返回0

* */

public class leetcode63 {

public static void main(String[] args) {

System.out.println(

new leetcode63().uniquePathsWithObstacles(new int[][]{

{0,0,0},

{0,1,0},

{0,0,0},

{0,0,0}

})

);

}

public int uniquePathsWithObstacles(int[][] obstacleGrid) {

return find(obstacleGrid,0,0);

}

public int find(int[][] obstacleGrid,int y,int x){

if (obstacleGrid[y][x]==1){ //这条路走不通

return 0;

}

if (y==obstacleGrid.length-1&&x==obstacleGrid[0].length-1){

return 1;

}

if (y+1<obstacleGrid.length&&x+1<obstacleGrid[0].length){

return find(obstacleGrid,y+1,x)+find(obstacleGrid,y,x+1);

}

if (y+1<obstacleGrid.length){

return find(obstacleGrid,y+1,x);

}

if (x+1<obstacleGrid.length){

return find(obstacleGrid,y,x+1);

}

return 0;

}

}