Fix size not being reset on resize operation

Author: euchangxian

src/dataStructures/hashSet/openAddressing/HashSet.java

@@ -295,6 +295,7 @@ private void resize(int newCapacity) {
         @SuppressWarnings("unchecked")
         T[] newBuckets = (T[]) new Object[newCapacity];
         this.buckets = newBuckets;
+        this.size = 0;
 
         // re-hashes every element and re-insert into the newly created buckets.
         Arrays.stream(temp)