DSA · Theory

Merge K Sorted Lists

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Theory

651/810

Merge K Sorted Lists

Merge K Sorted Lists is simple if you keep it on paper. Meera uses it for names A→Z in the roll list.

Merge K Sorted Lists on the board — n log n vs n². Then say what names A→Z looks like after.

Merge K Sorted Lists exists so Meera can keep names A→Z correct in the roll list.

Use Merge K Sorted Lists when names A→Z must stay clear. If a simpler DSA step works, use that instead.

Merge K Sorted Lists trap — unstable sort when equal keys matter. Meera loses marks for that every viva.

After Merge K Sorted Lists, Meera should still remember unstable sort when equal keys matter.

One breath for Merge K Sorted Lists, then names A→Z, then unstable sort when equal keys matter. Sit down.

Exam tip

For Merge K Sorted Lists: definition + the roll list + one failure.

Example

# Merge K Sorted Lists
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Merge K Sorted Lists: dry-run [4, 1, 3]. Say the list after one step.

Short notes

DefMerge K Sorted Lists — Meera uses it for names A→Z in the roll list.
RuleMerge K Sorted Lists → n log n vs n².
RememberMerge K Sorted Lists + a dry-run table (the roll list).
UseMerge K Sorted Lists in the roll list (names A→Z).
TrapMerge K Sorted Lists — unstable sort when equal keys matter.
ExMerge K Sorted Lists → names A→Z.

DSA · Theory

Merge K Sorted Lists

← All stacks

Theory

651/810

Merge K Sorted Lists

Merge K Sorted Lists is simple if you keep it on paper. Meera uses it for names A→Z in the roll list.

Merge K Sorted Lists on the board — n log n vs n². Then say what names A→Z looks like after.

Merge K Sorted Lists exists so Meera can keep names A→Z correct in the roll list.

Use Merge K Sorted Lists when names A→Z must stay clear. If a simpler DSA step works, use that instead.

Merge K Sorted Lists trap — unstable sort when equal keys matter. Meera loses marks for that every viva.

After Merge K Sorted Lists, Meera should still remember unstable sort when equal keys matter.

One breath for Merge K Sorted Lists, then names A→Z, then unstable sort when equal keys matter. Sit down.

Exam tip

For Merge K Sorted Lists: definition + the roll list + one failure.

Example

# Merge K Sorted Lists
data = [4, 1, 3]
print("start", data)
if data[0] > data[1]:
    data[0], data[1] = data[1], data[0]
print("after one step", data)

Merge K Sorted Lists: dry-run [4, 1, 3]. Say the list after one step.

Short notes

DefMerge K Sorted Lists — Meera uses it for names A→Z in the roll list.
RuleMerge K Sorted Lists → n log n vs n².
RememberMerge K Sorted Lists + a dry-run table (the roll list).
UseMerge K Sorted Lists in the roll list (names A→Z).
TrapMerge K Sorted Lists — unstable sort when equal keys matter.
ExMerge K Sorted Lists → names A→Z.

Merge K Sorted Lists

Example

Short notes

Questions

Merge K Sorted Lists

Example

Short notes

Questions