题解

#include <iostream>
using namespace std;
int a[100010],b[100010],c[100010];
int main(){
    string s1,s2;
    cin>>s1>>s2;
    int len1=s1.size(),len2=s2.size();
    for (int i=0; i<len1;i++)a[i]=s1[len1-i-1]-'0';
    for (int i=0; i<len2;i++)b[i]=s2[len2-i-1]-'0';
    int len=max(len1,len2); 
    for(int i=0;i<len;i++){
    c[i]+=a[i]+b[i];
    c[i+1]+=c[i]/10;
    c[i]%=10;
    }
    if(c[len])len++;
    for(int i=len-1; i>=0;i--) cout<<c[i];
    return 0;
}