uva : 343 - What Base Is This?

#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;
char a[10000],b[10000];
long long c[10000],d[10000];

long long base(char e[],long long ba)
{
    long long sum=0;
    for(long long i=0;i<strlen(e);i++)
    {
        long long m;
        if(e[i]>='A'&&e[i]<='Z')m=e[i]-'A'+10;
        else m=e[i]-'0';
        sum=sum*ba+m;
    }
    return sum;
}

int main()
{
    //freopen("output.txt","w",stdout);
   // freopen("input.txt","r",stdin);
    while(scanf("%s %s",&a,&b)==2)
    {
        long long m1=0,m2=0;
        for(long long i=0;i<strlen(a);i++)
        {
            long long n;
            if(a[i]>='A'&&a[i]<='Z')n=a[i]-'A'+10;
            else n=a[i]-'0';
            c[i]=n;
            if(m1<n)m1=n;
        }
        for(long long i=0;i<strlen(b);i++)
        {
            long long n;
            if(b[i]>='A'&&b[i]<='Z')n=b[i]-'A'+10;
            else n=b[i]-'0';
            d[i]=n;
            if(m2<n)m2=n;
        }
        long long flag=0;
        if(m1==0)m1=1;
        if(m2==0)m2=1;
        for(int i=m1+1;i<37&&flag==0;i++)
        {
            for(int j=m2+1;j<37&&flag==0;j++)
            {
                long long m=base(a,i);
                long long n=base(b,j);
               // printf("%d %d %d %d %s %s\n",m,n,i,j,a,b);
                if(m==n){printf("%s (base %d) = %s (base %d)\n",a,i,b,j);flag=1;}
            }
        }
        if(flag==0)printf("%s is not equal to %s in any base 2..36\n",a,b);
    }
    return 0;
}