Google Code Jam : Alien Numbers

// practice problems, April 12, 2008

// http://code.google.com/codejam/contest/dashboard?c=32003#s=p0

// @BEGIN_OF_SOURCE_CODE

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <string>
#include <cctype>
#include <stack>
#include <queue>
#include <vector>
#include <map>
#include <sstream>
#include <set>
#include <math.h>
#define For(i, a) for ( i = 0; i < a; i++ )
#define Rep(i, a, b) for ( i = a; i <= b; i++ )
#define N 1000000
using namespace std;

int returnBase (char *a, char *s)
{
    string baseFormat;
    char *pch;

    for ( int i = 0; a [i]; i++ ) {
        pch = strchr (s, a [i]);
        //printf ("%d\n", pch - s + 1);
        baseFormat += ((pch - s) + '0');
    }

    //cout << baseFormat;

    int output = 0;
    int sLength = strlen (s);
    int baseLength = baseFormat.length () - 1;
    int power = 0;

    while ( baseLength > -1 ) {
        //int p = ceil (pow (sLength, power));
        //int t = (baseFormat.at (baseLength) - '0');
        //output += (p * t);
        output += ((baseFormat.at (baseLength) - '0') * ceil (pow (sLength, power)));
        baseLength--;
        power++;
    }

    return output;
}

void printOutput (char *a, int n)
{
    int length = strlen (a);
    string convertBase;

    while ( n ) {
        convertBase += (( n % length) + '0');
        //cout << convertBase;
        n /= length;
    }

    reverse (convertBase.begin (), convertBase.end ());
    //cout << convertBase;

    for ( unsigned int i = 0; i < convertBase.size (); i++ ) {
        cout << a [convertBase [i] - '0'];
    }

    cout << endl;

}

int main ()
{
    freopen ("A-large.in", "r", stdin);
    freopen ("out-large.out", "w", stdout);
    int n;
    scanf ("%d", &n);
    int cases = 0;

    while ( n-- ) {
        char alienNumber [1000];
        char sourceLanguage [1000];
        char targetLanguage [1000];

        scanf ("%s %s %s", alienNumber, sourceLanguage, targetLanguage);

        printf ("Case #%d: ", ++cases);
        int nthNumber = returnBase (alienNumber, sourceLanguage);
        //printf ("%d\n", nthNumber);
        printOutput (targetLanguage, nthNumber);
    }

    return 0;
}

// @END_OF_SOURCE_CODE