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9장 전화번호목록 효율성 테스트 케이스 4번 실패 수정 #4

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9장 전화번호목록 효율성 테스트 케이스 4번 실패 수정 #4

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20 changes: 12 additions & 8 deletions 9장/전화번호목록.java
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Original file line number Diff line number Diff line change
Expand Up @@ -4,20 +4,24 @@

public class Solution {
public boolean solution(String[] phoneBook) {
Set<String> prefixes = new HashSet<>();
Set<String> phoneNumbers = new HashSet<>();

phoneBook = Arrays.stream(phoneBook)
.sorted((p1, p2) -> {
return p1.length() - p2.length();
})
.toArray(String[]::new);

for (String phone : phoneBook) {
for (int end = 1; end < phone.length(); end++) {
prefixes.add(phone.substring(0, end));
}
}
String prefix = phone.substring(0, end);

for (String phone : phoneBook) {
if (prefixes.contains(phone)) {
return false;
if(phoneNumbers.contains(prefix)) return false;
}

phoneNumbers.add(phone);
}

return true;
}
}
}