题题需要问一下，感恩。

#include <iostream>
#include <vector>
using namespace std;
const int N = 1e6 + 10;
vector<int> Add(vector<int>& A, vector<int>& B)
{
    vector<int> C;
    int t = 0;
    for (unsigned int i = 0; i < A.size() || i < B.size(); i++)
    {
        if (i < A.size()) t += A[i];
        if (i < B.size()) t += B[i];
        C.push_back(t % 10);
        t /= 10;
    }
    if (t) C.push_back(1);
    return C;
}
int main()
{
    string a, b;
    vector<int> A, B;
    cin >> a >> b;
    for (int i = a.size() - 1; i >= 0; i--)
    {
        A.push_back(a[i] - '0');
    }
    for (int i = b.size() - 1; i >= 0; i--)
    {
        B.push_back(b[i] - '0');
    }
    vector<int> C = Add(A, B); //可以写成auto C=Add(A,B) C++11的新特性，自动推断C的类型
    for (int i = C.size() - 1; i >= 0; i--)
    {
        printf("%d", C[i]);
    }
    return 0;
}