Count Repeated IP Addresses | Dataford Interview Questions

Given a list of log lines as strings, return the IP address that appears most often. Each valid line starts with an IPv4 address followed by a space and the rest of the message. Ignore malformed lines that do not start with a valid IPv4 address. If multiple IPs have the same highest count, return the lexicographically smallest one. If no valid IP exists, return an empty string.

Constraints

1 <= len(logs) <= 10^4
0 <= len(logs[i]) <= 200
Each line is a string
A valid IPv4 address has exactly 4 numeric parts
Each IPv4 part must be in the range 0 to 255

Function Signature

def most_frequent_ip(logs):

Your question is Count Repeated IP Addresses. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.

Problem

Constraints

1 <= len(logs) <= 10^4
0 <= len(logs[i]) <= 200
Each line is a string
A valid IPv4 address has exactly 4 numeric parts
Each IPv4 part must be in the range 0 to 255

Function Signature

def most_frequent_ip(logs):

Your question is Count Repeated IP Addresses. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.