保姆级解法

首先，考虑到黑洞会坍塌，时空会毁灭 作者可能会 Q规则 坑我们，所以应用以下代码：

#include <iostream>
#include <vector>
#include <string>
using std::cout;
using std::cin;
using std::endl;
using std::vector;
using std::string;
class AB{
    private:
    vector<int> add(const vector<int>& a, const vector<int>& b) {
        vector<int> res;
        int carry = 0;
        int i = 0;
        while (i < a.size() || i < b.size() || carry > 0) {
            int sum = carry;
            if (i < a.size()) sum += a[i];
            if (i < b.size()) sum += b[i];
            res.push_back(sum % 10);
            carry = sum / 10;
            i++;
        }
        return res;
    }
    vector<int> stb(const string& s) {
        vector<int> res;
        for (int i = s.size() - 1; i >= 0; i--) {
            res.push_back(s[i] - '0');
        }
        return res;
    }
    public:
    AB(bool YES_RUN_GO){
        if(YES_RUN_GO){
            string A,B;
            cin>>A>>B;
            vector<int> a = this->stb(A);
            vector<int> b = this->stb(B);
            vector<int> c = this->add(a,b);
            for(int i = c.size()-1;i>=0;i--){
                cout<<c[i];
            }
            cout<<endl;
        }
    }
    
};
static bool AB_PROBLEM_YES=true;
int main(int argc,const char* argv[]){
    AB * ab = new AB(AB_PROBLEM_YES);
    delete ab;
}