我的代码

#include<iostream>
#include<vector>
#include<cstdio>
using namespace std;
const int N=1e6+10;
vector<int> ADD(vector<int>& A,vector<int>& B)
{
    if(A.size()<B.size())return ADD(B,A);
    vector<int> C;
    int t=0;
    for(int i=0;i<A.size();i++)
    {
        t+=A[i];
        if(i<B.size())t+=B[i];
        C.push_back(t%10);
        t/=10;
    }
    if(t>0)C.push_back(t);
    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');
    auto C=ADD(A,B);
    for(int i=C.size()-1;i>=0;i--)printf("%d",C[i]);
    printf("\n");
    return 0;
}