LeetCode 242. Valid Anagram

对俩个字符串各自扫一遍

class Solution {
public:
    bool isAnagram(string s, string t) {
        int len_s=s.length();
        int len_t=t.length();
        if(len_s!=len_t){
            return false;
        }
        int dp[30];
        memset(dp,0,sizeof(dp));
         for(string::iterator iter = s.begin();iter != s.end();++iter){
             dp[*iter-'a']++;
         }
         for(string::iterator iter=t.begin();iter!=t.end();iter++){
             dp[*iter-'a']--;
         }
         for(int i=0;i<26;i++){
             if(dp[i]){
                 return false;
             }
         }
         return true;
    }
};