UVa 343 What Base Is This? Solution

#include<iostream>
#include<list>
#include<string>
#include<cstring>
#include<sstream>
#include<cctype>
#include<string.h>
#include<algorithm>
#include<cmath>
#include<stack>
#include<fstream>
#include<cstdlib>
#include<vector>
#include<map>
#include<utility>
#include<iomanip>
#include<queue>
using namespace std;
#define clr(a) memset(a,0,sizeof(a))
#define fill(a,v) memset(a,v,sizeof(a))
#define PB push_back
#define pi acos(-1.0)
#define eps 1e-9


int main()
{
    string s1,s2;
    bool check,conti;
    long base1,base2,power,i,sum1,sum2;
    while(cin>>s1>>s2)
    {
        check=false;

        for(base1=2;base1<=36;base1++)
            {
                for(base2=2;base2<=36;base2++)

                {
                    sum1=0;
                    power=0;
                    conti=false;

                    for(i=s1.length()-1;i>=0;i--)
                    {
                        if(s1[i]>47 && s1[i]<58)
                        {
                            sum1+=(s1[i]-48)*pow(base1,power++);
                            if(s1[i]-48>=base1)
                            conti=true;
                        }

                        else
                        {
                            sum1+=(s1[i]-55)*pow(base1,power++);
                            if(s1[i]-55>=base1)
                            conti=true;
                        }
                    }


                    sum2=0;
                    power=0;

                    for(i=s2.length()-1;i>=0;i--)
                    {
                        if(s2[i]>47 && s2[i]<58)
                        {
                            sum2+=(s2[i]-48)*pow(base2,power++);
                            if(s2[i]-48>=base2)
                            conti=true;
                        }

                        else
                        {
                            sum2+=(s2[i]-55)*pow(base2,power++);
                            if(s2[i]-55>=base2)
                            conti=true;
                        }
                    }
                    if(conti)
                    continue;

                    if(sum1==sum2)
                    {
                        check=true;
                        cout<<s1<<" (base "<<base1<<") = "<<s2<<" (base "<<base2<<")"<<endl;
                        break;
                    }
                }
                if(check)
                break;
            }
        if(!check)
        cout<<s1<<" is not equal to "<<s2<<" in any base 2..36"<<endl;
    }
return 0;
}