题解 | a+b

#include<iostream>
#include<string>
#include<vector>
using namespace std;
int main(){
    string a,b;
    while(cin>>a>>b){

        while(a.size()<b.size()){
            a='0'+a;
        }
        while(b.size()<a.size()){
            b='0'+b;
        }
        vector<int>v;
        int flag=0;
        for(int i=a.size()-1;i>=0;i--){
            if(a[i]-'0'+b[i]-'0'+flag>9){
                v.insert(v.begin(),a[i]-'0'+b[i]-'0'+flag-10);
                flag=1;
            }
            else{
                v.insert(v.begin(),a[i]-'0'+b[i]-'0'+flag);
                flag=0;
            }
        }
        if(flag==1){
            v.insert(v.begin(),1);
        }
        for(auto p:v){
            cout<<p;
        }
        cout<<endl;
    }
}