Parameterize references to generic types. (#5078)

* chore: remove unused imports

* fix: parameterize references to generic types


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Co-authored-by: vil02 <65706193+vil02@users.noreply.github.com>

src/main/java/com/thealgorithms/searches/UnionFind.java

@@ -45,7 +45,7 @@ public class UnionFind {
     }
 
     public int count() {
-        List parents = new ArrayList();
+        List<Integer> parents = new ArrayList<>();
         for (int i = 0; i < p.length; i++) {
             if (!parents.contains(find(i))) {
                 parents.add(find(i));