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661. 图片平滑器

class Solution {
   public:    vector
   
    
     > imageSmoother(vector
     
      
       >& M) {
           int m = M.size(), n = M.front().size();        vector
       
        
         > result(m, vector
         
          (n)); for (int i = 0; i < m; ++i) { for (int j = 0; j < n; ++j) { int num = 0, sum = 0; for (int _i = max(0, i-1); _i <= min(m-1, i+1); ++_i) { for (int _j = max(0, j-1); _j <= min(n-1, j+1); ++_j) { sum += M[_i][_j]; ++num; } } result[i][j] = sum / num; } } return result; }};
         
        
       
      
     
    
   

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