高精度加法编译错误，求调

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

vector<int> add(vector<int> &A, vector<int> &B)
{
    vector<int> C;
    int t = 0;
    for(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 = t / 10;
    }
    if(t)
    {
        C.push_back(t);
    }
    return C;
}

int main()
{
    string a, b;
    cin >> a >> b;
    vector<int> 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');
    }
    auto C = add(A, B);
    for(int i = C.size - 1;i >= 0;i--)
    {
        cout << C[i];
    }
    return 0;
}