Heron

void CleanStopwords(string& line, vector<string>& stopwords)
{
	long a = 0;
	long b = line.find(' ');

	string t;
	string cleaned;

	while(a != -1)
	{
		if(b != -1)
			t = line.substr(a, b-a);
		else
			t = line.substr(a);

		if(!VectorContainsWord(stopwords, t))
		{
			cleaned += t;
			if(b != -1)
				cleaned += ' ';
		}

		if(b == -1)
			a = -1;
		else
		{
			a = b+1;
			b = line.find(' ', a);
		}
	}

	line = cleaned;
}

bool VectorContainsWord(vector<string>& v, string& s)
{
	unsigned long low = 0;
	unsigned long high = v.size()-1;

	unsigned long pos = (high+low)/2;

	long c;

	bool bFound = false;

	while(low < high-1 && !bFound)
	{
		c = v[pos].compare(s);
		if(c < 0)
		{
			low = pos;
		}
		else if(c > 0)
		{
			high = pos;
		}
		else
		{
			bFound = true;
		}

		pos = (high + low)/2;
	}

	if(low == high && v[low].compare(s) == 0)
	{
		bFound = true;
	}
	else if(low == high-1)
	{
		if(v[low].compare(s) == 0)
		{
			bFound = true;
		}
		else if(v[high].compare(s) == 0)
		{
			bFound = true;
		}
	}

	return bFound;
}