题解

        #include<iostream>
        #include<string>
        using namespace std;
        int a1[20000]={0},a2[20000]={0},a3[20000]={0};
        int main(){
            string s,s1;
            cin>>s>>s1;
            for(int i=0;i<s.size();i++)
                a1[i]=s[s.size()-1-i]-'0';
            for(int i=0;i<s1.size();i++)
                a2[i]=s1[s1.size()-1-i]-'0';
            int maxlen=max(s.size(),s1.size());
            for(int i=0;i<maxlen;i++){
                a3[i]+=a1[i]+a2[i];
                if(a3[i]>=10){
                    a3[i+1]+=a3[i]/10;
                    a3[i]%=10;
                }
            }
            if(a3[maxlen]!=0)
                maxlen++;
            for(int i=maxlen-1;i>=0;i--){
                cout<<a3[i];
            }
        	return 0;
    }