Leetcode Problem 420. Strong Password Checker

420. Strong Password Checker

Leetcode Solutions

Initialize variables to track the number of deletions, insertions, replacements, and missing character types (lowercase, uppercase, digit).
Calculate the number of deletions required if the password length exceeds 20.
Check for the presence of lowercase, uppercase, and digit characters, and update the missing types count accordingly.
Identify sequences of three or more repeating characters and calculate the number of replacements needed to break them up.
If deletions are required, use them to reduce the number of replacements by targeting sequences that contribute most to the replacement count.
Calculate the number of insertions required if the password length is less than 6.
The total number of steps is the sum of deletions, the maximum of insertions, replacements, and missing types.

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