class Solution {
public:
    int countServers(vector<vector<int>>& grid) {
        if (!grid.size())
            return 0;
        int m = grid.size(), n = grid[0].size();
        vector<int> row(m);
        vector<int> col(n);
        int ret = 0, temp = 0;
        for (int i = 0; i < m; i++) {
            for (int j = 0; j < n; j++) {
                ret += grid[i][j];
                row[i] += grid[i][j];
            }
            if (row[i] == 1) temp++;
        }
        for (int i = 0; i < n; i++) {
            int t = -1;
            for (int j = 0; j < m; j++) {
                col[i] += grid[j][i];
                if (grid[j][i])
                    t = j;
            }
            if (col[i] == 1 && row[t] == 1) {
                ret--;
            }
        }
        return ret;
    }
};