【leetcode】463. Island Perimeter

problem

​​463. Island Perimeter​​

solution:

class Solution {
public:
    int islandPerimeter(vector<vector<int>>& grid) {
        if(grid.empty()) return 0;
        int m=grid.size(), n=grid[0].size();
        int ans = 0;
        for(int i=0; i<m; i++)
        {
            for(int j=0; j<n; j++)
            {
                if(grid[i][j]==0) continue;
                if(j==0 || grid[i][j-1]==0) ans++;
                if(j==n-1 || grid[i][j+1]==0) ans++;
                if(i==0 || grid[i-1][j]==0) ans++;
                if(i==m-1 || grid[i+1][j]==0) ans++;
            }
        }
        return ans;
    }
};

 

 

参考

1. ​​Leetcode_463. Island Perimeter​​;

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