Follow up for "Unique Paths":
Now consider if some obstacles are added to the grids. How many unique paths would there be?
An obstacle and empty space is marked
as 1 and 0 respectively in the
grid.
For example,
There is one obstacle in the middle of a 3x3 grid as illustrated below.
[ [0,0,0], [0,1,0], [0,0,0] ]
The total number of unique paths is 2.
Note: m and n will be at most 100.
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public class Solution { public
int uniquePathsWithObstacles(int[][] obstacleGrid) { int
path = 0; int
row = obstacleGrid.length; if(row > 0){ int
column = obstacleGrid[0].length; int[][] paths = new
int[row][column]; if(obstacleGrid[0][0] != 1){ paths[0][0] = 1; for(int
i = 1; i < row; ++i){ if(obstacleGrid[i][0] != 1) paths[i][0] = paths[i - 1][0]; else paths[i][0] = 0; } for(int
i = 1; i < column; ++i){ if(obstacleGrid[0][i] != 1) paths[0][i] = paths[0][i - 1]; else paths[0][i] = 0; } for(int
i = 1; i < row; ++i){ for(int
j = 1; j < column; ++j){ if(obstacleGrid[i][j] != 1) paths[i][j] = paths[i - 1][j] + paths[i][j - 1]; else paths[i][j] = 0; } } path = paths[row - 1][column - 1]; } } return
path; }} |
leetcode--Unique Paths II,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/averillzheng/p/3774551.html
