Code Explanation:
Importing the Required Libraries
import heapq, operator
heapq: A Python module that provides heap queue (priority queue) algorithms.
It maintains a list such that the smallest element is always at index 0.
operator: Provides function equivalents of operators like +, -, *, /.
For example, operator.add(a, b) is equivalent to a + b.
Creating a List of Numbers
nums = [7, 2, 9, 1]
A simple Python list is created with four integers: [7, 2, 9, 1].
At this stage, it is just a normal unsorted list.
Converting the List into a Heap
heapq.heapify(nums)
Converts the list into a min-heap in place.
A min-heap ensures the smallest element is always at index 0.
After heapifying, the internal arrangement becomes something like:
nums = [1, 2, 9, 7]
(The exact internal order can vary, but 1 is always at the root.)
Adding a New Element to the Heap
heapq.heappush(nums, 3)
Adds a new element (3) into the heap while maintaining the heap property.
The heap reorganizes itself so the smallest element remains at the top.
The new heap might look like:
nums = [1, 2, 9, 7, 3]
Removing the Smallest Element
a = heapq.heappop(nums)
Removes and returns the smallest element from the heap.
Here, a = 1 because 1 is the smallest value.
The heap is then rearranged automatically to maintain its structure.
Removing the Next Smallest Element
b = heapq.heappop(nums)
Again removes and returns the next smallest element.
After 1 is removed, the next smallest is 2.
So, b = 2.
The heap now looks like [3, 7, 9].
Adding the Two Smallest Values
print(operator.add(a, b))
operator.add(a, b) performs addition just like a + b.
Adds the two popped values: 1 + 2 = 3.
The result (3) is printed.
Final Output
3





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