[subject line]
First Impl for Word Ladder
[Bug input/output]
input   output  expected
"a", "c", ["a","b","c"] 0   2

[Fix]
See next Commit
[subject line]
fix submission issue related to string cmp
but runtime exceeds
[Bug input/output]
"qa", "sq",
["si","go","se","cm","so","ph","mt","db","mb","sb","kr","ln","tm","le","av","sm","ar","ci","ca","br","ti","ba","to","ra","fa","yo","ow","sn","ya","cr","po","fe","ho","ma","re","or","rn","au","ur","rh","sr","tc","lt","lo","as","fr","nb","yb","if","pb","ge","th","pm","rb","sh","co","ga","li","ha","hz","no","bi","di","hi","qa","pi","os","uh","wm","an","me","mo","na","la","st","er","sc","ne","mn","mi","am","ex","pt","io","be","fm","ta","tb","ni","mr","pa","he","lr","sq","ye"]

[Fix]
see next commit
[subject line]
Using BFS + adjacent List to speed up
but still TLE
see
http://blog.sina.com.cn/s/blog_b9285de20101j1xl.html

[Bug input/output]
Very big input dic
[Fix]
see next commit