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An abbreviation of a word follows the form <first letter><number><last letter>. Below are some examples of word abbreviations:
a) it --> it (no abbreviation)
1
b) d|o|g --> d1g
1 1 1
1---5----0----5--8
c) i|nternationalizatio|n --> i18n
1
1---5----0
d) l|ocalizatio|n --> l10n
Assume you have a dictionary and given a word, find whether its abbreviation is unique in the dictionary. A word‘s abbreviation is unique if no other word from the dictionary has the same abbreviation.
Example:
Given dictionary = [ "deer", "door", "cake", "card" ]
isUnique("dear") -> false
isUnique("cart") -> true
isUnique("cane") -> false
isUnique("make") -> true
1 class ValidWordAbbr { 2 private: 3 unordered_map<string, int> m_map; 4 unordered_set<string> m_set; 5 public: 6 ValidWordAbbr(vector<string> &dictionary) { 7 for (auto word : dictionary) { 8 m_set.insert(word); 9 if (word.length() == 2) ++m_map[word]; 10 else ++m_map[word.front() + to_string(word.length() - 2) + word.back()]; 11 } 12 } 13 14 bool isUnique(string word) { 15 string key; 16 if (word.length() == 2) key = word; 17 else key = word.front() + to_string(word.length() - 2) + word.back(); 18 if (m_set.find(word) == m_set.end()) return m_map[key] < 1; 19 else return m_map[key] < 2; 20 } 21 }; 22 23 24 // Your ValidWordAbbr object will be instantiated and called as such: 25 // ValidWordAbbr vwa(dictionary); 26 // vwa.isUnique("hello"); 27 // vwa.isUnique("anotherWord");
[LeetCode] Unique Word Abbreviation
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原文地址：http://www.cnblogs.com/easonliu/p/4852129.html
