Checking if two strings are permutations of each other

Question

How to determine if two strings are permutations of each other

Answer 1

bool is_permutation1(string str1, string str2) {
    sort(str1.begin(), str1.end());
    sort(str2.begin(), str2.end());
    for (int i = 0; i < str1.length(); i++) {    
        if (str1[i] != str2[i]) {
            return false;
        }
    }
    return true;
}