2299. Strong Password Checker II

A password is said to be strong if it satisfies all the following criteria:

• It has at least 8 characters.
• It contains at least one lowercase letter.
• It contains at least one uppercase letter.
• It contains at least one digit.
• It contains at least one special character. The special characters are the characters in the following string: “!@#$%^&*()-+”.
• It does not contain 2 of the same character in adjacent positions (i.e., “aab” violates this condition, but “aba” does not).

Given a string password, return true if it is a strong password. Otherwise, return false.

class Solution {
    bool isspecial(char ch) {
        string sp = "!@#$%^&*()-+";
        return sp.find(ch) != string::npos;
    }
public:
    bool strongPasswordCheckerII(string s) {
        bool lower = false, upper = false, digit = false, special = false;
        if(s.length() < 8) return false;
        for(int i = 0; i < s.length(); i++) {
            if(i + 1 != s.length() and s[i] == s[i+1]) return false;
            if(islower(s[i])) lower = true;
            else if(isupper(s[i])) upper = true;
            else if(isdigit(s[i])) digit = true;
            else if(isspecial(s[i])) special = true;
        }
        return lower and upper and digit and special;
    }
};