bool isAnagram(char * s, char * t){
    int n = strlen(s);
    int m = strlen(t);
    
    int cnt_s[1000], cnt_t[1000];
    for (int c = 97; c < 97 + 26; c++)
        cnt_s[c] = cnt_t[c] = 0;

    for (int i = 0; i < n; i++)
        cnt_s[s[i]]++;
    
    for (int i = 0; i < m; i++)
        cnt_t[t[i]]++;
    
    for (int c = 97; c < 97 + 26; c++)
        if (cnt_s[c] != cnt_t[c])
            return false;

    return true;
}