Process Logs

Problem Overview

• Identify suspicious users from money transfer logs who appear in at least a given threshold of entries.
• Input: logs[n] strings "sender recipient amount" and an int threshold; Output: user_id strings sorted by numeric value.
• Constraints: n up to 1e5; IDs/amount are 1–9 digits, start non-zero; 1 ≤ threshold ≤ n.
• Context: Analyze application logs to flag potential suspicious activity.
• From Snowflake interviews; a coding interview problem and common interview question.