大数加法（高精度加法）

#include<iostream>
#include<cstring>
#include<cstdlib> 
using namespace std;

int main(){
    string s1,s2;
    cin>>s1>>s2;
    string maxx=s1,minn=s2;
    if(s1.size()<s2.length()){
        maxx=s2;
        minn=s1;
    }
    int a=maxx.length()-1,b=minn.length()-1;
    for(int i=b;i>=0;i--){
        maxx[a--]+=minn[i]-'0';
    }

    for(int i=maxx.length()-1;i>0;i--){
        if(maxx[i]>'9'){
            maxx[i]-=10;
            maxx[i-1]++;
        }
    }
    if(maxx[0]>'9'){
        maxx[0]-=10;
        maxx="1"+maxx;
    }
    cout<<maxx;
    return 0;
}