Set Matrix to zero | Shweta Bandagale

class Solution {
public:
    void setZeroes(vector<vector<int>>& matrix) {
       unordered_set<int>r;
        unordered_set<int>c;
        int m = matrix.size();
        int n = matrix[0].size();

        for(int i = 0; i<m; i++){
            for(int j = 0; j<n; j++){
                if(matrix[i][j]==0){
                    r.insert(i);
                    c.insert(j);
                }
            }
        }

        for(auto it = r.begin(); it!=r.end(); it++){
            int i = *it;

            for(int j = 0; j<n; j++){
                matrix[i][j] = 0;
            }
        }

        for(auto it = c.begin(); it!=c.end(); it++){
            int j = *it;

            for(int i = 0; i<m; i++){
                matrix[i][j] = 0;
            }
        }

    }
};