* Testcase Example: '["MyHashSet","add","add","contains","contains","add","contains","remove","contains"]\n[[],[1],[2],[1],[3],[2],[2],[2],[2]]' * Design a HashSet ...
There are several ways to find duplicates in a Java List, array or other collection class. The following list describes some of the most commonly used approaches: Use a method in the Java Streams API ...
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