Login Attempts Log Problem | Dataford Interview Questions

Given a log file of login attempts (each line has status failed/accept, the user who tried to log in and the IP), output the IPs for the user 'hacker' whose attempts have status failed.

Asked in the phone screen stage. Coding problem at the end of the screen.

Input and Output

Implement failed_hacker_ips(log_lines). log_lines is a list of whitespace-separated strings in the format status user ip. Return a list of matching IP strings in their original order. Preserve duplicate IPs. Every input line has exactly three fields and a status of failed or accept.

Constraints

0 <= len(log_lines) <= 10^5
Each line contains exactly three whitespace-separated fields: status, user, and IP
status is either failed or accept
user and IP are non-empty strings
Return every matching attempt, including duplicate IPs, in input order

Function Signature

def failed_hacker_ips(log_lines):

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Problem