288. Unique Word Abbreviation

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An abbreviation of a word follows the form . Below are some examples of word abbreviations:

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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:

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Given dictionary = [ "deer", "door", "cake", "card" ]
isUnique("dear") ->
false
isUnique("cart") ->
true
isUnique("cane") ->
false
isUnique("make") ->
true

解法1：

莫名其妙的一题。。
C++

1

Java

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public class ValidWordAbbr {
    HashMap<String, Integer> map = null;
    HashMap<String, Integer> countMap = null;
    public ValidWordAbbr(String[] dictionary) {
        map = new HashMap<>();
        countMap = new HashMap<>();
        for (String str : dictionary) {
            String abbr = getAbbr(str);
            map.put(abbr, map.getOrDefault(abbr, 0) + 1);
            countMap.put(str, countMap.getOrDefault(str, 0) + 1);
        }
    }
    private String getAbbr(String str) {
        if (str.length() <= 2) {
            return str;
        }
        return str.substring(0, 1) + Integer.toString(str.length() - 2) + str.substring(str.length() - 1, str.length());
    }
    public boolean isUnique(String word) {
        String key = getAbbr(word);
        int abbrCount = map.getOrDefault(key, 0);
        int count = countMap.getOrDefault(word, 0);
        return abbrCount <= count;
    }
}
/**
 * Your ValidWordAbbr object will be instantiated and called as such:
 * ValidWordAbbr obj = new ValidWordAbbr(dictionary);
 * boolean param_1 = obj.isUnique(word);
 */