C++
class Solution {
public:
string multiply(string num1, string num2) {
int l1=num1.size(),l2=num2.size();
string res(l1+l2,'0');
if(l1==0
class Solution {
public:
string multiply(string num1, string num2) {
int l1=num1.size(),l2=num2.size();
string res(l1+l2,'0');
if(l1==0