[LeetCode] - Masking Personal Information

pesudo code

1
decide if it is an email or phone

2-1 (email case)
Split string array into 3 strings

3-1
Get the first element of a divided string array

4-1
Extracting the first and last characters of an imported string

5-1
Put 5 astarisks in the extracted string and return

6-1
Concatenate the created string with the rest of the string array and return it

2-2 (phone case)
Create a phone number by extracting only numbers with ASCII code, 
and check the presence or absence of a country code 
by obtaining the number of digits of the phone number.

3-2
In case of country code with +,-, etc.
Separating the rest of the last 10 digits by country code

4-2
Separate 10 numbers into a string array with lengths of 3,3,4

5-2
Replace the first and second elements of the divided array with Astaris

6-2
The separated country code and area code are combined with-and returned.

3-3
If the country code is not marked with +,-, etc.
Separate 10 numbers into a string array with lengths of 3,3,4

4-3
Replace the first and second elements of the divided array with Astaris

5-3
Returned by appending '-' to the substituted string

 

1차 시도

class Solution {
    public String maskPII(String S) {
        boolean check = false;
        check = S.contains("@");
        
        if(check) {
            // Email Case
            S = S.toLowerCase();
            String[] emailArr = new String[3];
            emailArr = seperateEmail(emailArr, S);
            emailArr[0] = appendingAsterisk(emailArr[0]);
            return makeEmail(emailArr);
        }else {
            // Phone Case
            String temp = extractNumber(S);
            int numberLength = temp.length();
            if(numberLength < 12){
                // has not Country Code
                String[] numberArr = new String[3];
                if(numberLength == 10){
                    numberArr[0] = temp.substring(0,3);
                    numberArr[1] = temp.substring(3,6);
                    numberArr[2] = temp.substring(6,10);
                }else {
                    numberArr[0] = temp.substring(0,3);
                    numberArr[1] = temp.substring(3,7);
                    numberArr[2] = temp.substring(7,11);
                }
                return makePhoneNumber(numberArr); 
            }else {
                // has Country Code
                String[] numberArr = new String[4];
                if(numberLength == 12){
                    numberArr[0] = temp.substring(0,2);
                    numberArr[1] = temp.substring(2,5);
                    numberArr[2] = temp.substring(5,8);
                    numberArr[3] = temp.substring(8,12);
                }else {
                    numberArr[0] = temp.substring(0,3);
                    numberArr[1] = temp.substring(3,6);
                    numberArr[2] = temp.substring(6,9);
                    numberArr[3] = temp.substring(9,13);
                }
                return makePhoneNumber(numberArr);
        }
    }
}
    public String[] seperateEmail(String[] emailArr, String s) {
        String[] temp = s.split("@");
        emailArr[0] = temp[0];
        temp = temp[1].split("\\.");
        emailArr[1] = temp[0];
        emailArr[2] = temp[1];
        return emailArr;
    }
    
    public String appendingAsterisk(String first) {
        String temp = "";
        temp += first.charAt(0);
        temp += "*****";
        temp += first.charAt(first.length()-1);
        return temp;
    }
    
    public String makeEmail(String[] emailArr){
        String temp = "";
        temp += emailArr[0];
        temp += "@";
        temp += emailArr[1];
        temp += ".";
        temp += emailArr[2];
        return temp;
    }
    
    public String extractNumber(String s){
        // 0 ~ 9 ASCII CODE -> 48 ~ 57 
        String temp = "";
		for(int i = 0; i < s.length(); i++) {
			if(48 <=s.charAt(i) && s.charAt(i) <= 57) {
				temp += s.charAt(i);
			}
		}
        return temp;
    }
    
    public String makePhoneNumber(String[] numberArr) {
        
        String temp = "";
        String middle = "";
        if(numberArr.length < 4){
            middle = makeAsterisk(numberArr[1].length());
            temp += "***-"+middle+"-"+numberArr[2];
        }else{
            temp += "+"+makeAsterisk(numberArr[0].length());
            middle = makeAsterisk(numberArr[2].length());
            temp += "-***-"+middle+"-"+numberArr[3];
        }
        
        return temp;
    }
    
    public String makeAsterisk(int number) {
        String asterisk = "";
        for(int i = 0; i < number; i++) {
            asterisk += "*";
        }
        return asterisk;
    }
}
Error Case
Input: "+86(88)1513-7-74"
Output: "***-****-3774"
Expected: "+*-***-***-3774"

 

2차시도

class Solution {
    public String maskPII(String S) {
        boolean check = false;
        check = S.contains("@");
        
        if(check) {
            // Email Case
            S = S.toLowerCase();
            String[] emailArr = new String[3];
            emailArr = seperateEmail(emailArr, S);
            emailArr[0] = appendingAsterisk(emailArr[0]);
            return makeEmail(emailArr);
        }else {
            // Phone Case
            String temp = extractNumber(S);
            int numberLength = temp.length();
            if(numberLength < 11){
                // has not Country Code
                String[] numberArr = new String[3];
                numberArr[0] = temp.substring(0,3);
                numberArr[1] = temp.substring(3,6);
                numberArr[2] = temp.substring(6,10);
                return makePhoneNumber(numberArr); 
            }else {
                // has Country Code
                String[] numberArr = new String[4];
                if(numberLength == 11){
                    numberArr[0] = temp.substring(0,1);
                    numberArr[1] = temp.substring(1,4);
                    numberArr[2] = temp.substring(4,7);
                    numberArr[3] = temp.substring(7,11);
                }else if(numberLength == 12){
                    numberArr[0] = temp.substring(0,2);
                    numberArr[1] = temp.substring(2,5);
                    numberArr[2] = temp.substring(5,8);
                    numberArr[3] = temp.substring(8,12);
                }else {
                    numberArr[0] = temp.substring(0,3);
                    numberArr[1] = temp.substring(3,6);
                    numberArr[2] = temp.substring(6,9);
                    numberArr[3] = temp.substring(9,13);
                }
                return makePhoneNumber(numberArr);
        }
    }
}
    public String[] seperateEmail(String[] emailArr, String s) {
        String[] temp = s.split("@");
        emailArr[0] = temp[0];
        temp = temp[1].split("\\.");
        emailArr[1] = temp[0];
        emailArr[2] = temp[1];
        return emailArr;
    }
    
    public String appendingAsterisk(String first) {
        String temp = "";
        temp += first.charAt(0);
        temp += "*****";
        temp += first.charAt(first.length()-1);
        return temp;
    }
    
    public String makeEmail(String[] emailArr){
        String temp = "";
        temp += emailArr[0];
        temp += "@";
        temp += emailArr[1];
        temp += ".";
        temp += emailArr[2];
        return temp;
    }
    
    public String extractNumber(String s){
        // 0 ~ 9 ASCII CODE -> 48 ~ 57 
        String temp = "";
		for(int i = 0; i < s.length(); i++) {
			if(48 <=s.charAt(i) && s.charAt(i) <= 57) {
				temp += s.charAt(i);
			}
		}
        return temp;
    }
    
    public String makePhoneNumber(String[] numberArr) {
        
        String temp = "";
        String middle = "";
        if(numberArr.length < 4){
            middle = makeAsterisk(numberArr[1].length());
            temp += "***-"+middle+"-"+numberArr[2];
        }else{
            temp += "+"+makeAsterisk(numberArr[0].length());
            middle = makeAsterisk(numberArr[2].length());
            temp += "-***-"+middle+"-"+numberArr[3];
        }
        
        return temp;
    }
    
    public String makeAsterisk(int number) {
        String asterisk = "";
        for(int i = 0; i < number; i++) {
            asterisk += "*";
        }
        return asterisk;
    }
}
Runtime: 11 ms
Memory Usage: 38.1 MB

 

---

0MS 답안

class Solution {
    public String maskPII(String S) {
        S = S.toLowerCase();
        int idx = S.indexOf('@');
        StringBuilder res = new StringBuilder();
        if (idx > 0) {
            res.append(S.charAt(0));
            res.append("*****");
            res.append(S.charAt(idx-1));
            res.append(S.substring(idx));
        } else {
            StringBuilder digits = new StringBuilder();
            for (char c : S.toCharArray())
                if (Character.isDigit(c)) digits.append(c);
            if (digits.length() == 10) {
                res.append("***-***-");
                res.append(digits.substring(6));
            } else {
                res.append('+');
                for (int i = 0; i < digits.length()-10; ++i) res.append('*');
                res.append('-');
                res.append("***-***-");
                res.append(digits.substring(digits.length()-4));
            }
        }
        return res.toString();
    }
}

제공하는 답안

class Solution {
    public String maskPII(String S) {
        int atIndex = S.indexOf('@');
        if (atIndex >= 0) { // email
            return (S.substring(0, 1) + "*****" + S.substring(atIndex - 1)).toLowerCase();
        } else { // phone
            String digits = S.replaceAll("\\D+", "");
            String local = "***-***-" + digits.substring(digits.length() - 4);
            if (digits.length() == 10) return local;
            String ans = "+";
            for (int i = 0; i < digits.length() - 10; ++i)
                ans += "*";
            return ans + "-" + local;
        }
    }
}