Build ladder data structure

buildLadderDataStructure.cpp

void buildLadderDataStructure(vector<element> &wordListDS) 
{
    int wordListSize = wordListDS.size();

	for (int i = 0; i < wordListSize; ++i)
	{
		for (int j = i + 1; j < wordListSize; ++j)
		{
			element e1 = wordListDS.at(i);
			element e2 = wordListDS.at(j);

			int diff = getDiffCount(e1.word, e2.word);

			if (diff == 1) {
				wordListDS.at(i).links.push_back(&wordListDS.at(j));
				wordListDS.at(j).links.push_back(&wordListDS.at(i));
			}			
		}
	}
}