leetcode463. Island Perimeter
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计算周长,遇到一个1加4.
在去判断这个1的周围,如果有1,结果减一。
class Solution {public: int islandPerimeter(vector<vector<int>>& grid) { int r=grid.size(); int c=grid[0].size(); int ans=0; for(int i=0;i<r;i++){ for(int j=0;j<c;j++){ if(grid[i][j]==1){ ans+=4; if(i+1<r&&grid[i+1][j]==1) ans-=1; if(i-1>=0&&grid[i-1][j]==1) ans-=1; if(j+1<c&&grid[i][j+1]==1) ans-=1; if(j-1>=0&&grid[i][j-1]==1) ans-=1;} } } return ans; }};
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