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DSA · Theory

Merge two sorted arrays with O(1) extra space

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Theory

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Merge two sorted arrays with O(1) extra space

Merge two sorted arrays with O(1) extra space is simple if you keep it on paper. Priya uses it for names A→Z in the roll list.

Keep Merge two sorted arrays with O(1) extra space small. Priya should finish names A→Z in a few lines, not a 40-line dump.

Skip Merge two sorted arrays with O(1) extra space and unstable sort when equal keys matter shows up in the roll list.

Priya ships Merge two sorted arrays with O(1) extra space in the roll list. That is the use case worth saying.

If names A→Z breaks under Merge two sorted arrays with O(1) extra space, check unstable sort when equal keys matter first.

Merge two sorted arrays with O(1) extra space is not a lonely heading. Priya ties it to names A→Z.

Viva for Merge two sorted arrays with O(1) extra space: what it is → n log n vs n² → the mistake (unstable sort when equal keys matter).

Exam tip

For Merge two sorted arrays with O(1) extra space: definition + the roll list + one failure.

Example

# Merge two sorted arrays with O(1) extra space
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 two sorted arrays with O(1) extra space: dry-run [4, 1, 3]. Say the list after one step.

Short notes

  • DefMerge two sorted arrays with O(1) extra space — Priya uses it for names A→Z in the roll list.
  • RuleMerge two sorted arrays with O(1) extra space → n log n vs n².
  • RememberMerge two sorted arrays with O(1) extra space + time vs memory (the roll list).
  • UseMerge two sorted arrays with O(1) extra space in the roll list (names A→Z).
  • TrapMerge two sorted arrays with O(1) extra space — unstable sort when equal keys matter.
  • ExMerge two sorted arrays with O(1) extra space → names A→Z.

Questions

1

Priya asks: why does Merge two sorted arrays with O(1) extra space exist? Use names A→Z.

2

If you skip Merge two sorted arrays with O(1) extra space, what breaks in the roll list?

3

What trap does Priya hit with Merge two sorted arrays with O(1) extra space?

4

Dry-run n log n vs n² and say the result.

Previous← Merge Sort Tree for Range Order StatisticsNextMinimum increment by k operations to make all elements equal →
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