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#include "leetcode.h"
class Solution {
public:
string multiply(string num1, string num2) {
if (num1 == "0" || num2 == "0")
return "0";
vector<int> res(num1.size() + num2.size(), 0);
for (int i = num1.size() - 1; i >= 0; i--) {
for (int j = num2.size() - 1; j >= 0; j--) {
res[i + j + 1] += (num1[i] - '0') * (num2[j] - '0');
res[i + j] += res[i + j + 1] / 10;
res[i + j + 1] %= 10;
}
}
int i = 0;
string ans = "";
while (res[i] == 0)
i++;
while (i < res.size())
ans += to_string(res[i++]);
return ans;
}
};
int main() {}
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