```java public class SolutionPart1 { public static class Event { String event_type; java.util.Map customer_details; } public java.util.Set solution(java.util.List events) { Set eventData = new HashSet<>(); List piiData = List.of("address","email","phone","ssn"); for(Event event: events){ if(event.customer_details ==null){ continue; } for(String pii: piiData){ if(event.customer_details.containsKey(pii) && event.customer_details.get(pii)!=null){ eventData.add(event.customer_details.get(pii)); } } } return eventData; } } public class SolutionPart2 { public static class Event { public static final String UNDERWRITING ="underwriting"; public static final String FRAUDFLAG ="fraud_flag"; String event_type; java.util.Map customer_details; } public java.util.List solution(java.util.List events) { Set fraudSsn = new HashSet<>(); for(Event event: events){ if (!Event.FRAUDFLAG.equals(event.event_type)) continue; if(event.customer_details !=null && event.customer_details.containsKey("ssn") && event.customer_details.get("ssn")!=null){ fraudSsn.add(event.customer_details.get("ssn")); } } List result = new ArrayList<>(); for(Event event: events){ if (!Event.UNDERWRITING.equals(event.event_type)) continue; result.add(event.customer_details != null &&event.customer_details.containsKey("ssn") && fraudSsn.contains(event.customer_details.get("ssn"))); } return result; } } ```

Quick Overview

Detect fraud events and extract PII