class Solution{
    public:
        int numSpecial(vector<vector<int>> &mat){
            int ans = 0;
            int r = mat.size();
            int c = mat[0].size();
            for(int row=0;row<r;row++){
                for(int col = 0;col<c;col++){
                    if(mat[row][col]==0) continue;
                    bool good = true;
                    for(int m = 0;m<r;m++){
                        if(m!=row && mat[m][col] == 1){
                            good = false;
                            break;
                        }
                    }
                      for(int n = 0;n<c;n++){
                        if(n!=col && mat[row][n] == 1){
                            good = false;
                            break;
                        }
                    }
                      if(good) ans++;


                }
            }
            return ans;
        }
};

//TC : o(r.c(r+c))  SC: o(1)