Package g0401_0500.s0420_strong_password_checker

Class Solution

java.lang.Object

g0401_0500.s0420_strong_password_checker.Solution

public class Solution
extends Object

420 - Strong Password Checker.

Hard

A password is considered strong if the below conditions are all met:

• It has at least 6 characters and at most 20 characters.
• It contains at least one lowercase letter, at least one uppercase letter, and at least one digit.
• It does not contain three repeating characters in a row (i.e., "...aaa..." is weak, but "...aa...a..." is strong, assuming other conditions are met).

Given a string password, return the minimum number of steps required to make password strong. if password is already strong, return 0.

In one step, you can:

• Insert one character to password,
• Delete one character from password, or
• Replace one character of password with another character.

Example 1:

Input: password = “a”

Output: 5

Example 2:

Input: password = “aA1”

Output: 3

Example 3:

Input: password = “1337C0d3”

Output: 0

Constraints:

• 1 <= password.length <= 50
• password consists of letters, digits, dot '.' or exclamation mark '!'.

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	strongPasswordChecker(String s)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

strongPasswordChecker

public int strongPasswordChecker(String s)