编程练习：Spell checker

http://poj.org/problem?id=1035

Description


You, as a member of a development team for a new spell checking program, are to write a module that will check the correctness of given words using a known dictionary of all correct words in all their forms. 
If the word is absent in the dictionary then it can be replaced by correct words (from the dictionary) that can be obtained by one of the following operations: 
?deleting of one letter from the word; 
?replacing of one letter in the word with an arbitrary letter; 
?inserting of one arbitrary letter into the word. 
Your task is to write the program that will find all possible replacements from the dictionary for every given word. 
Input


The first part of the input file contains all words from the dictionary. Each word occupies its own line. This part is finished by the single character '#' on a separate line. All words are different. There will be at most 10000 words in the dictionary. 
The next part of the file contains all words that are to be checked. Each word occupies its own line. This part is also finished by the single character '#' on a separate line. There will be at most 50 words that are to be checked. 
All words in the input file (words from the dictionary and words to be checked) consist only of small alphabetic characters and each one contains 15 characters at most. 
Output


Write to the output file exactly one line for every checked word in the order of their appearance in the second part of the input file. If the word is correct (i.e. it exists in the dictionary) write the message: " is correct". If the word is not correct then write this word first, then write the character ':' (colon), and after a single space write all its possible replacements, separated by spaces. The replacements should be written in the order of their appearance in the dictionary (in the first part of the input file). If there are no replacements for this word then the line feed should immediately follow the colon.
Sample Input


i
is
has
have
be
my
more
contest
me
too
if
award
#
me
aware
m
contest
hav
oo
or
i
fi
mre
#
Sample Output


me is correct
aware: award
m: i my me
contest is correct
hav: has have
oo: too
or:
i is correct
fi: i
mre: more me
Source

思路：

根据字典创建 TrieTree, 而后在　TrieTree 执行 mach rule

到没有找到匹配的时候：

?deleting of one letter from the word; 

tree 中直接找到下一个字母，记录单词，并设计 fault_count =1 

?replacing of one letter in the word with an arbitrary letter; 

tree 中随便找一个字母作为下一个，记录单词，并设计 fault_count =1 

前两条　false_count = 2 就舍弃

?inserting of one arbitrary letter into the word. 

（这条规则不好办...)  

枚举单词间隔加入一个字母（新单词有mx26个，m为字母间隔），而后搜索　trietree ，　必须完全匹配