Package g0401_0500.s0420_strong_password_checker

Class Solution

java.lang.Object
g0401_0500.s0420_strong_password_checker.Solution
public class Solution extends java.lang.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(java.lang.String s)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • strongPasswordChecker

      public int strongPasswordChecker(java.lang.String s)