Created
August 29, 2016 17:37
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import collections | |
class TrieNode(object): | |
def __init__(self, letter=None): | |
self.letter = letter | |
self.freq = 1 | |
self.suffixes = collections.OrderedDict() | |
def add(self, word): | |
node = self | |
for letter in word: | |
if not letter in node.suffixes: | |
node.suffixes[letter] = TrieNode(letter) | |
else: | |
node.suffixes[letter].freq += 1 | |
node = node.suffixes[letter] | |
def __str__(self): | |
s = str(self.letter) + ':' + str(self.freq) + '{' | |
for v in self.suffixes.values(): | |
s += str(v) | |
s += '}' | |
return s | |
class Solution: | |
# @param A : list of strings | |
# @return a list of strings | |
def prefix(self, A): | |
trie = TrieNode() | |
for word in A: | |
trie.add(word) | |
print(trie) | |
res = [] | |
def dfs(node, path=None): | |
if not path: | |
path = [] | |
if node: | |
if node.letter and len(node.suffixes) < 2 and node.freq == 1: | |
res.append(''.join(path[1:]+[node.letter])) | |
else: | |
for suffix in node.suffixes: | |
dfs(node.suffixes[suffix], path+[node.letter]) | |
dfs(trie) | |
return res | |
if __name__ == '__main__': | |
s = Solution() | |
print(s.prefix(['abde', 'abc', 'bc'])) | |
print(s.prefix(['zebra', 'dog', 'duck', 'dove'])) | |
print(s.prefix([ "bearcat", "bert" ])) |
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