Masking Personal Information — LeetCode 831 Python Solution

The problem

You are given a personal information string s, representing either an email address or a phone number. Return the masked personal information using the below rules.

Example

Input

s = "LeetCode@LeetCode.com"

Output

"l*****e@leetcode.com"

Explanation

s is an email address.

Python solution

class Solution:
    def maskPII(self, s: str) -> str:
        if s[0].isalpha():
            s = s.lower()
            return s[0] + '*****' + s[s.find('@') - 1 :]
        s = ''.join(c for c in s if c.isdigit())
        cnt = len(s) - 10
        suf = '***-***-' + s[-4:]
        return suf if cnt == 0 else f'+{"*" * cnt}-{suf}'

Complexity

Pattern: Hash Map

Trade memory for time: remember what you have seen so the second pass never happens. LeetCode 831. Masking Personal Information is filed here because the reference solution below belongs to the algorithm family this hub collects, even though its LeetCode tags point elsewhere.

The hash map guide has the Python template for the pattern and the 709 LeetCode problems that use it.

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