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23S-Section-Solution

23S-Section-Solution - CS106X Winter 2008 Handout 23S...

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CS106X Handout 23S Winter 2008 February 6 – 8, 2008 Section Solution Problem 1: Generating Anagrams bool FindAnagramWithFixedPrefix(string prefix, string rest, Lexicon& lex, Vector<string>& words) { if (!lex.containsPrefix(prefix)) return false; if (lex.containsWord(prefix) && prefix.length() >= 4) { if (rest == "" || FindAnagram(rest, lex, words)) { words.add(prefix); return true; } } for (int i = 0; i < rest.length(); i++) { if (FindAnagramWithFixedPrefix(prefix + rest[i], rest.substr(0, i) + rest.substr(i + 1), lex, words)) return true; } return false; } bool FindAnagram(string letters, Lexicon& lex, Vector<string>& words) { return FindAnagramWithFixedPrefix("", letters, lex, words); } Problem 2: Creating Word Wreck Tangles /** * Function: IsReasonableToContinue * -------------------------------- * Contemplates the given board, which is assumed to be populated * from left to right, top to bottom with visible characters, all * the way through the (row, col) entry. We assume that this (row, col) * character is the most recently placed character and is the only * character that could have invalidated the partial board. We
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