49 add union find data structure - #62
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added 30 commits
May 25, 2026 13:52
…tor implementation
…concerns and notes in a comment
…t for subsets to HashMap
… mismatches that will be sorted out later on if I decide to stick with HashMaps
…by size in UnsortedUnionFind
…w private method contains(T e)
…ure maps fulfil set requirement
…) as static method problematic due to variable type
…ionFind; adapt interfaces accordingly
…by size in SortedUnionFindTest
added 30 commits
August 14, 2026 14:54
… functions accordingly
…he class ParentPointerTree anymore
…need the class ParentPointerTree anymore
…which union is to be performed via a constructor parameter
…patibility issues
…arentPointerTreeUnionFind immutable
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So far, this includes the interfaces UnionFind, SortedUnionFind, PersistentUnionFind and PersistentSortedUnionFind as well as the abstract classes AbstractImmutableUnionFind and AbstractImmutableSortedUnionFind. It also contains a naive implementation of SortedUnionFind based on a HashMap of TreeSets (SortedTreeSetUnionFind). There is a set of tests (SortedUnionFindTest), but there seems to be some kind of problem regarding null values which is causing the JDK21 PackageSanityTest to fail. This in particular is something I'd appreciate input on. Thanks!