Given a pattern and a string str, find if str follows the same pattern.
Here follow means a full match, such that there is a bijection between a letter in pattern and a non-empty word in str.
Examples:
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pattern = "abba", str = "dog cat cat dog" should return true.
pattern = "abba", str = "dog cat cat fish" should return false.
pattern = "aaaa", str = "dog cat cat dog" should return false.
pattern = "abba", str = "dog dog dog dog" should return false.
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Notes:
You may assume pattern contains only lowercase letters, and str contains lowercase letters separated by a single space.
代码
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public boolean wordPattern(String pattern, String str) {
String[] strs = str.split(" ");
if(pattern.length() != strs.length) return false;
Map<Character, String> map = new HashMap<Character, String>();
for(int i=0;i<pattern.length();i++) {
if(!map.containsKey(pattern.charAt(i))) {
if(map.containsValue(strs[i])) return false;
map.put(pattern.charAt(i), strs[i]);
}else {
if(strs[i].equals(map.get(pattern.charAt(i)))) continue;
else return false;
}
}
return true;
}
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