661. Image Smoother
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].
解题思路:
暂时想不到好办法。。用最蠢的M*N*8算了。
- class Solution {
- public:
- vector<vector<int>> imageSmoother(vector<vector<int>>& M) {
- if(M.size()==0) return M;
- vector<vector<int>> ret = M;
- vector<vector<int>> store;
- for(int i=0;i<M.size();i++)
- for(int j=0;j<M[0].size();j++)
- ret[i][j]=0;
- for(int i=0;i<M.size();i++){
- for(int j=0;j<M[0].size();j++){
- int sum=0;
- int count=0;
- sum+=M[i][j];count++;
- if(j-1>=0) {sum+=M[i][j-1];count++;}
- if(j+1<M[0].size()) {sum+=M[i][j+1];count++;}
- if(i-1>=0){
- sum+=M[i-1][j];count++;
- if(j-1>=0) {sum+=M[i-1][j-1];count++;}
- if(j+1<M[0].size()) {sum+=M[i-1][j+1];count++;}
- }
- if(i+1<M.size()){
- sum+=M[i+1][j];count++;
- if(j-1>=0) {sum+=M[i+1][j-1];count++;}
- if(j+1<M[0].size()) {sum+=M[i+1][j+1];count++;}
- }
- ret[i][j]= sum/count;
- }
- }
- return ret;
- }
- };