MediumNo. 0831
Masking Personal Information — LeetCode 831 Python Solution
- Pattern
- Hash Map
- Topics
- String
- Reading time
- 2 min
- Source
- leetcode.com
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
- Time
- O(n)
- Space · auxiliary
- O(n)where n is the length of the string s
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.
Related problems
| No. | Problem | Difficulty |
|---|---|---|
| 0830 | Positions of Large Groups | Easy |
| 0824 | Goat Latin | Easy |
| 0006 | Zigzag Conversion | Medium |
| 0008 | String to Integer (atoi) | Medium |
| 0038 | Count and Say | Medium |
| 0058 | Length of Last Word | Easy |
Frequently asked questions
- How hard is LeetCode 831. Masking Personal Information?
LeetCode 831. Masking Personal Information is rated Medium on LeetCode.
- What is the time complexity of LeetCode 831. Masking Personal Information?
The Python solution on this page runs in O(n).
- What is the space complexity of LeetCode 831. Masking Personal Information?
The Python solution on this page uses O(n), where n is the length of the string s auxiliary space.
- What topics does LeetCode 831. Masking Personal Information cover?
LeetCode 831. Masking Personal Information is tagged String on LeetCode.