1. ► Heapify operation just takes O(lg(n)) steps

2. ► hash_map is also part of the standard C++

3. ► Merging two heaps is a O(lg(n)) operation

4. ► Heapsort relies on heap to pick the minimum or maximum element

5. ► Hash map guarantees constant time value access

6. ► In a min-heap, value at a node is always less than that of its children

7. ► Elements in hash_map are ordered

8. ► STL map provides access in lg(n) time

9. ► Quick sort always performs better than heapsort

10. ► STL map is unordered

11. ► A pointer map ordering varies from one run to another

12. ► A good hash function will be collision free