Leetcode 63 Unique Paths II

triplebee

发布于 2018-01-12 15:04:45

4260

发布于 2018-01-12 15:04:45

文章被收录于专栏：计算机视觉与深度学习基础计算机视觉与深度学习基础

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题一致，在转移的时候加一个特判条件，只有是空地的时候才转移。

https://cloud.tencent.com/developer/article/1019268

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[i-1][j-1]==0)
                    dp[i][j]=dp[i-1][j]+dp[i][j-1];
        return dp[obstacleGrid.size()][obstacleGrid[0].size()];  
    }
};

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原始发表：2016-09-19 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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