Anagram of String.md

int remAnagram(string str1, string str2)
{
    int arr[CHARS] = {0};
    for (int i = 0; i < str1.length(); i++)
        arr[str1[i] - 'a']++;
     
    for (int i = 0; i < str2.length(); i++)
        arr[str2[i] - 'a']--;
     
    long long int ans = 0;
    for(int i = 0; i < CHARS; i++)
        ans +=abs(arr[i]);
    return ans;
}