小题解（老师online教的...

#include<bits/stdc++.h>
using namespace std;
int main(){
    char ch1[500],ch2[500];
    cin>>ch1>>ch2;
    int len,len1=strlen(ch1),len2=strlen(ch2),a[500]={0},b[500]={0};
    for(int i=1;i<=len1;i++){
        a[i]=ch1[len1-i]-'0';
    }
    for(int i=1;i<=len2;i++){
        b[i]=ch2[len2-i]-'0';
    }
    len=max(len1,len2);
    for(int i=1;i<=len;i++){
        a[i]+=b[i];
        a[i+1]+=a[i]/10;
        a[i]%=10;
    }
    len++;
    while((a[len]==0)&&len>1){
        len--;
    }
    for(int i=len;i>=1;i--){
        cout<<a[i];
    }
    return 0; 
}