Hat’s Words
Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 8482 Accepted Submission(s): 3053
Problem Description
A hat’s word is a word in the dictionary that is the concatenation of exactly two other words in the dictionary.
You are to find all the hat’s words in a dictionary.
Input
Standard input consists of a number of lowercase words, one per line, in alphabetical order. There will be no more than 50,000 words.
Only one case.
Output
Your output should contain all the hat’s words, one per line, in alphabetical order.
Sample Input
a
ahat
hat
hatword
hziee
word
Sample Output
ahat
hatword
大意：给定若干个字符串，找出这种字符串——它可由其它两个字符串拼接得到。
分析：考虑两种特殊情况：
input-----
a
bc
ab
c
abc
output----
abc
input-----
b
ba
baab
baabb
output----
baabb
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