清除行列

class Clearer {
public:
    vector<vector<int>> clearZero(vector<vector<int>> mat, int n) {
        // write code here
        //vector<vector<int>> res;
        if(mat.size() == 0)
            return mat;
        
        int rowSize = mat.size();
        int colSize = mat[0].size();
        
        bool row[300] = {0};
        bool col[300] = {0};
        
        for(int i = 0;i < rowSize; i++){
            for(int j = 0;j < colSize; j++){
                if(mat[i][j] == 0){
                    row[i] = true;
                    col[j] = true;
                }
            }
        }
          
        for(int i = 0;i < rowSize;i++){
            for(int j = 0;j < colSize;j++){
                if(row[i] || col[j]){
                    mat[i][j] = 0;
                }
            }
        }
        
        return mat;
    }
};