大整数乘法，简洁写法

#include <bits/stdc++.h>
// #include <string>
// #include <vector>
using namespace std;

const int N = 1e5 + 10;

vector<int> multiplyLargeNumbers(const string &a, const string &b) {
    vector<int> result(a.size() + b.size(), 0);

    for (int i = 0; i < a.size(); i++) {
        int num1 = a[a.size() - 1 - i] - '0';
        for (int j = 0; j < b.size(); j++) {
            int num2 = b[b.size() - 1 - j] - '0';
            result[i + j] += num1 * num2;
            result[i + j + 1] += result[i + j] / 10;
            result[i + j] %= 10;
        }
    }

    while (result.size() > 1 && result.back() == 0) {
        result.pop_back();
    }

    reverse(result.begin(), result.end());
    return result;
}

int main() {
    string a, b;
    cin >> a >> b;

    vector<int> product = multiplyLargeNumbers(a, b);

    for (int digit : product) {
        cout << digit;
    }
    cout << endl;

    return 0;
}