#include <bits/stdc++.h>
using namespace std;
int main()
{
    char s1[502],s2[502];
    int a[502],b[502],c[502];
    int i,l1,l2,l3,f=0;
    memset(a,0,sizeof(a));
    memset(b,0,sizeof(b));
    memset(c,0,sizeof(c));
    scanf("%s",s1);
    l1=strlen(s1);
    scanf("%s",s2);
    l2=strlen(s2);
    for (i=l1-1;i>=0;i--)
    {
        a[i]=s1[i]-'0';
    }
    for (i=l2-1;i>=0;i--)
    {
        b[i]=s2[i]-'0';
    }
    for (i=0;i<=max(l1,l2);i++)
    {
        c[i]=a[i]+b[i]+f;
        f=c[i]/10;
        c[i]=c[i]%10;
    }
    l3=max(l1,l2);
    while (c[l3]==0&&l3!=0) 
    {
        l3-=1;
    }
    for (i=0;i<=l3;i++)
    {
        printf("%d",c[i]);
    }
    return 0;
}

一直都是WA QAQ