add 2212_Stolen_Jewel
intend to use double array...
wrote Trie
wrote Trie, but TLE
change cost memorizing way
implemented AhoCorasick, but it didn't work well
AhoCorasick didn't work well
set<int> is useless
AhoCorasick probably works well
solve 2212_Stolen_Jewel
Merge branch 'feature-2212'