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g0401_0500.s0420_strong_password_checker.readme.md Maven / Gradle / Ivy

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 `'!'`.