242 valid anagram

242. Valid Anagram

题目： https://leetcode.com/problems/valid-anagram/

难度 : Easy

一行瞬秒：

class Solution(object):
    def isAnagram(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        return collections.Counter(s) == collections.Counter(t)

class Solution(object):
    def isAnagram(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        return sorted(s) == sorted(t)

用字数统计，因为只可能是26个字母

class Solution(object):
    def isAnagram(self, s, t):
        """
        :type s: str
        :type t: str
        :rtype: bool
        """
        if len(s) != len(t):
            return False

        charCnt = [0] * 26

        for i in range(len(s)):
            charCnt[ord(s[i]) - 97] += 1
            charCnt[ord(t[i]) - 97] -= 1 

        for cnt in charCnt:
            if cnt != 0:
                return False
        return True

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