Description

Submission

class Solution {
public:
    vector<vector<int>> imageSmoother(vector<vector<int>>& img) {
        int m = img.size();
        int n = img[0].size();

        vector<vector<int>> rets(m, vector<int>(n));

        for(int i = 0; i < m; ++i) {
            for(int j = 0; j < n; ++j) {
                int cnt = 0, sum = 0;
                for(int k = -1; k <= 1; ++k) {
                    int x = i + k;
                    if(x < 0 || x >= m) continue;
                    for(int t = -1; t <= 1; ++t) {
                        int y = j + t;
                        if(y < 0 || y >= n) continue;
                        sum += img[x][y];
                        ++cnt;
                    }
                }

                rets[i][j] = floor(sum * 1.0 / cnt);
            }
        }
        return rets;
    }
};