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Leetcode 63 Unique Paths II

栏目：php教程时间：2016-12-03 09:45:56

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.

和62题1致，在转移的时候加1个特判条件，只有是空地的时候才转移。

http://blog.csdn.net/accepthjp/article/details/52585069

class Solution { public: int uniquePathsWithObstacles(vector<vector<int>>& obstacleGrid) { if(obstacleGrid.size()==0) return 0; vector<int> row(obstacleGrid[0].size()+1,0); vector<vector<int>> dp(obstacleGrid.size()+1,row); dp[0][1]=1; for(int i=1;i<=obstacleGrid.size();i++) for(int j=1;j<=obstacleGrid[0].size();j++) if(obstacleGrid[i⑴][j⑴]==0) dp[i][j]=dp[i⑴][j]+dp[i][j⑴]; return dp[obstacleGrid.size()][obstacleGrid[0].size()]; } };

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