Question at position 5 The algorithm works by repeatedly:Reversing the listCopying the listRemoving valuesChecking values and swapping them if neededClear my selection

Question

Question at position 5 The algorithm works by repeatedly:Reversing the listCopying the listRemoving valuesChecking values and swapping them if neededClear my selection

BlackTom AI · Accepted Answer

Bubble sort repeatedly compares adjacent elements and swaps them when they are in the wrong order, so "Checking values and swapping them if needed" is the correct description.

Relevant concepts:
- Sorting by adjacent comparisons: Bubble sort makes multiple passes through the list, comparing each pair of neighbors.
- Swap operation: If a left element is greater than the right (for ascending order), the two are exchanged.
- Termination: Repeated passes continue until a full pass makes no swaps.

Step-by-step reasoning with an example:
Start with the list [5, 2, 4, 1, 3].

Pass 1 (compare adjacent pairs left→right):
- Compare 5 and 2: 5 > 2 → swap → [2, 5, 4, 1, 3]
- Compare 5 and 4: 5 > 4 → swap → [2, 4, 5, 1, 3]
- Compare 5 and 1: 5 > 1 → swap → [2, 4, 1, 5, 3]
- Compare 5 and 3: 5 > 3 → swap → [2, 4, 1, 3, 5]
(After pass 1 the largest element 5 has "bubbled" to the end.)

Pass 2:
- Compare 2 and 4: 2 ≤ 4 → no swap → [2, 4, 1, 3, 5]
- Compare 4 and 1: 4 > 1 → swap → [2, 1, 4, 3, 5]
- Compare 4 and 3: 4 > 3 → swap → [2, 1, 3, 4, 5]
- Compare 4 and 5: 4 ≤ 5 → no swap

Pass 3:
- Compare 2 and 1: 2 > 1 → swap → [1, 2, 3, 4, 5]
- Remaining comparisons produce no swaps → algorithm terminates.

Why the correct answer is correct:
The core operation repeatedly performed by bubble sort is checking adjacent values and swapping when necessary; this process is what sorts the list over multiple passes.

Why other options are incorrect:
- Reversing the list: That flips order once and does not sort in general.
- Copying the list: Making copies is not the defining repeated action of the sort.
- Removing values: Deletion is unrelated to bubble sort’s mechanism.

Final confirmation: The correct answer, "Checking values and swapping them if needed," matches the provided answer.

Question at position 5 The algorithm works by repeatedly:Reversing the listCopying the listRemoving valuesChecking values and swapping them if neededClear my selection单项选择题

类似问题

In bubble sort, what is the main operation performed repeatedly?

Question at position 4 The inner loop is responsible for:Checking if the list is emptyChecking each pair and swapping if neededCounting list lengthReversing the listClear my selection

Question at position 3 Why does Bubble Sort use "n-i-1" in the inner loop?To track memory usageTo sort backwardsTo avoid checking values already bubbled to the rightTo make the code shorterClear my selection

Question at position 2 What is the main purpose of the Bubble Sort algorithm?To sort values in a listTo reverse a listTo compress dataTo search itemsClear my selection

Question at position 1 Bubble Sort compares elements until:The largest is on the leftEvery element is in correct positionThe smallest is on the rightAll elements are removedClear my selection

What will the code print?

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