A+B Problem

今天教大家做A+B Problem

#include <iostream>
#include <vector>
#include <string>
using std::cout;
using std::cin;
using std::vector;
using std::string;
using std::ios;
class IO{
    public:
    template<typename T>T read(){
        T IN;cin>>IN;
        return IN;
    }
    template<typename ...T>void write(T...args){
        (cout<<...<<args);
    }
    template<typename ...T>void writeln(T...args){
        write(args...,"\n");
    }
};
class AB{
    private:
    string A,B;
    IO * io = new IO();
    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,int argc,const char* argv[]){
        if(YES_RUN_GO){
            this->A=io->read<string>(),this->B=io->read<string>();
        }
    }
    void __init__(bool YES_INIT_GO){
        if(YES_INIT_GO){
            vector<int> a = this->stb(this->A);
            vector<int> b = this->stb(this->B);
            vector<int> c = this->add(a,b);
            for(int i = c.size()-1;i>=0;i--){
                io->write(int(c[i]));
            }
            io->writeln();
        }
    }
    
};
static bool AB_PROBLEM_YES=true;
int main(int argc,const char* argv[]){
    ios::sync_with_stdio(0);
    cin.tie(0);
    AB * ab = new AB(AB_PROBLEM_YES,
                    argc,
                    argv);
    ab->__init__(AB_PROBLEM_YES);
    delete ab;
}

短短75行，包含了类、对象、函数、折叠表达式、模板、指针、维克托vector等基础，太简单了！