Merge K Sorted Lists Using Min Heap in DSA Go - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to initialize the min heap.

DSA Go

minHeap := &[1]{}

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AMinHeap

BListNodeHeap

CHeap

DPriorityQueue

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic name like MinHeap without defining it.

Using PriorityQueue which is not defined in this context.

The min heap is implemented as a ListNodeHeap struct to hold nodes.

2fill in blank

medium

Complete the code to push the first node of each list into the heap.

DSA Go

for _, node := range lists {
    if node != nil {
        heap.[1](minHeap, node)
    }
}

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AInsert

BAdd

CPush

DAppend

Attempts:

3 left

💡 Hint

Common Mistakes

Using Append which is for slices, not heap operations.

Using Add or Insert which do not exist in heap package.

heap.Push is the standard method to add an element to the heap in Go.

3fill in blank

hard

Fix the error in extracting the smallest node from the heap.

DSA Go

smallest := heap.[1](minHeap).(*ListNode)

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ARemove

BExtract

CTop

DPop

Attempts:

3 left

💡 Hint

Common Mistakes

Using Remove without an index causes errors.

Using Extract or Top which are not defined in heap package.

heap.Pop removes and returns the smallest element from the heap.

4fill in blank

hard

Fill both blanks to link nodes and push the next node into the heap.

DSA Go

current.Next = smallest
if smallest.[1] != nil {
    heap.[2](minHeap, smallest.Next)
}

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ANext

BPrev

CPush

DPop

Attempts:

3 left

💡 Hint

Common Mistakes

Using Prev instead of Next to access the next node.

Using Pop instead of Push to add nodes.

We check if smallest.Next exists, then push it into the heap.

5fill in blank

hard

Fill all three blanks to define the Less method for the min heap.

DSA Go

func (h ListNodeHeap) Less(i, j int) bool {
    return h[i].[1] < h[j].[2]
}

func (h ListNodeHeap) [3]() int {
    return len(h)
}

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AVal

BValue

CLen

DSize

Attempts:

3 left

💡 Hint

Common Mistakes

Using Value instead of Val which is the correct field name.

Using Size instead of Len for the length method.

The Less method compares node values using .Val, and Len returns the heap size.