[LeetCode]50. Valid Anagram有效变位词

Given two strings s and t, write a function to determine if t is an anagram of s.

For example,
s = "anagram", t = "nagaram", return true.
s = "rat", t = "car", return false.

Note:
You may assume the string contains only lowercase alphabets.

Follow up:
What if the inputs contain unicode characters? How would you adapt your solution to such case?

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解法：很简单的一道题。因为题目限定字符在26个小写字母之间，因此以vector作为Hash Table，分别统计两个字符串字母出现次数，然后再比较即可。

class Solution {
public:
    bool isAnagram(string s, string t) {
        int ss = s.size(), ts = t.size();
        if(ss != ts) return false;
        vector<int> v1(26, 0), v2(26, 0);
        for(int i = 0; i < ss; ++i)
        {
            ++v1[s[i] - 'a'];
            ++v2[t[i] - 'a'];
        }
        for(int i = 0; i < 26; ++i)
            if(v1[i] != v2[i]) return false;
        return true;
    }
};