1. ► Elements in hash_map are ordered

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

3. ► STL map is unordered

4. ► Quick sort always performs better than heapsort

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

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

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

8. ► Hash map guarantees constant time value access

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

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

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

12. ► A good hash function will be collision free