20分求助

#include<cstdio>
#include<iostream>
#include<string>
#include<cstring>
using namespace std;
string w,e;
const int Maxn=500+30;
int a[Maxn],b[Maxn],s[Maxn];
int n;
int main()
{
    cin>>w>>e;
    for(int i=0;i<w.size();++i)
    a[w.size()-i]=w[i]-'0';
    for(int i=0;i<e.size();++i)
    b[e.size()-i]=e[i]-'0';
    n=max(w.size(),e.size());
    for(int i=1;i<=n;++i)
    {
        s[i]=a[i]+b[i];
        if(s[i]>=10)
        {
            s[i+1]++;
            s[i]-=10;
        }
    }
    int p=500+10;
    while(!s[p])p--;
    for(int i=p;i>=1;--i)
    printf("%d",s[i]);
    printf("\n");
    return 0;
}

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