661

Author: rongweihe

661.Image-Smoother/main.cpp

@@ -0,0 +1,58 @@
+[link]  https://leetcode.com/problems/image-smoother/description/  
+
+[661]  
+Given a 2D integer matrix M representing the gray scale of an image, you need to design a smoother to make the gray scale of each cell becomes the average gray scale (rounding down) of all the 8 surrounding cells and itself. If a cell has less than 8 surrounding cells, then use as many as you can.  
+Example 1:  
+Input:  
+[[1,1,1],
+ [1,0,1],
+ [1,1,1]]
+Output:
+[[0, 0, 0],  
+ [0, 0, 0],  
+ [0, 0, 0]]  
+Explanation:  
+
+For the point (0,0), (0,2), (2,0), (2,2): floor(3/4) = floor(0.75) = 0  
+
+For the point (0,1), (1,0), (1,2), (2,1): floor(5/6) = floor(0.83333333) = 0  
+
+For the point (1,1): floor(8/9) = floor(0.88888889) = 0  
+
+Note:  
+
+The value in the given matrix is in the range of [0, 255].  
+
+The length and width of the given matrix are in the range of [1, 150].  
+
+[solution]  
+class Solution {
+public:
+    vector<vector<int>> imageSmoother(vector<vector<int>>& M) {
+    vector<vector<int>> ans(M);
+    int sum = 0,cnt=0;
+    int row = M.size();
+    int col= M[0].size();
+    for( int i = 0; i < row; ++i)
+    {
+        for( int j = 0; j < col; ++j)
+        {
+            sum =cnt = 0;
+            for( int ii= i-1; ii<= i+1; ++ii )
+            {
+                for( int jj= j-1; jj <= j+1; ++jj )
+                {
+                    if( ii< 0 || jj < 0 || ii >= row|| jj >= col) continue;
+                    sum += M[ii][jj];
+                    cnt++;
+                }
+            }
+            ans[i][j] = sum / cnt;
+        }
+    }
+        return ans;
+    }
+};
+
+
+