set_matrix_zeros.cpp

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

        for(int i = 0; i < m; i++){
            if(matrix[i][0] == 0)
                firstRow = 1;
        }

        for(int j = 0; j < n; j++){
            if(matrix[0][j] == 0)
                firstCol = 1;
        }

        for(int i = 1; i < m; i++){
            for(int j = 1; j < n; j++){
                if(matrix[i][j] == 0){
                    matrix[i][0] = 0;
                    matrix[0][j] = 0;
                }
            }
        }

        for(int i = 1; i < m; i++){
            for(int j = 1; j < n; j++){
                if(matrix[i][0] == 0 || matrix[0][j] == 0)
                    matrix[i][j] = 0;
            }
        }

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

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