734. Sentence Similarity
Given two sentences words1, words2
(each represented as an array of strings), and a list of similar word pairs pairs
, determine if two sentences are similar.
For example, "great acting skills" and "fine drama talent" are similar, if the similar word pairs are pairs = [["great", "fine"], ["acting","drama"], ["skills","talent"]]
.
Note that the similarity relation is not transitive. For example, if "great" and "fine" are similar, and "fine" and "good" are similar, "great" and "good" are not necessarily similar.
However, similarity is symmetric. For example, "great" and "fine" being similar is the same as "fine" and "great" being similar.
Also, a word is always similar with itself. For example, the sentences words1 = ["great"], words2 = ["great"], pairs = []
are similar, even though there are no specified similar word pairs.
Finally, sentences can only be similar if they have the same number of words. So a sentence like words1 = ["great"]
can never be similar to words2 = ["doubleplus","good"]
.
Note:
The length of
words1
and
words2
will not exceed
1000
.
The length of
pairs
will not exceed
2000
.
The length of each
pairs[i]
will be
2
.
The length of each
words[i]
and
pairs[i][j]
will be in the range
[1, 20]
.
Solution
(1) Java
(2) Python
class Solution:
def areSentencesSimilar(self, words1, words2, pairs):
"""
:type words1: List[str]
:type words2: List[str]
:type pairs: List[List[str]]
:rtype: bool
"""
if not words1 and not words2:
return True
elif not words1 or not words2:
return False
elif len(words1) != len(words2):
return False
for i in range(len(words1)):
word1 = words1[i]
word2 = words2[i]
if word1 == word2:
continue
found = False
for pair in pairs:
if word1 in pair and word2 in pair:
found = True
break
if not found:
return False
return True
Concise code
class Solution(object):
def areSentencesSimilar(self, words1, words2, pairs):
if len(words1) != len(words2): return False
pairset = set(map(tuple, pairs))
return all(w1 == w2 or (w1, w2) in pairset or (w2, w1) in pairset
for w1, w2 in zip(words1, words2))
(3) Scala