DSA · Theory

Sort an almost sorted array

Theory

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Sort an almost sorted array

Sort an almost sorted array is a DSA topic. In plain words you use it for names A→Z in the roll list. Don’t start with a slogan — start with that picture.

Smallest example: n log n vs n². Type it, run it, and say what you see. If you can do that from memory, you know Sort an almost sorted array.

From the example next to this theory: Sort an almost sorted array — arrays give O(1) index access; matrices are arrays of arrays.

Trap — unstable sort when equal keys matter. Fix that before you talk about advanced DSA.

Viva — what is Sort an almost sorted array? Then show n log n vs n². Then name the trap.

Diagram

  index →  0    1    2
  array → [10,  20,  30]

Exam tip

What is Sort an almost sorted array? Show this: n log n vs n². Trap: unstable sort when equal keys matter.

Example

arr = [10, 20, 30, 40]
print(arr[2], arr[-1])
matrix = [[1, 2], [3, 4]]
print(matrix[1][0])  # 3

Sort an almost sorted array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefSort an almost sorted array — names A→Z in the roll list.
Rulen log n vs n²
Trapunstable sort when equal keys matter
Usethe roll list

DSA · Theory

Sort an almost sorted array

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Theory

541/810

Sort an almost sorted array

Sort an almost sorted array is a DSA topic. In plain words you use it for names A→Z in the roll list. Don’t start with a slogan — start with that picture.

Smallest example: n log n vs n². Type it, run it, and say what you see. If you can do that from memory, you know Sort an almost sorted array.

From the example next to this theory: Sort an almost sorted array — arrays give O(1) index access; matrices are arrays of arrays.

Trap — unstable sort when equal keys matter. Fix that before you talk about advanced DSA.

Viva — what is Sort an almost sorted array? Then show n log n vs n². Then name the trap.

Diagram

  index →  0    1    2
  array → [10,  20,  30]

Exam tip

What is Sort an almost sorted array? Show this: n log n vs n². Trap: unstable sort when equal keys matter.

Example

arr = [10, 20, 30, 40]
print(arr[2], arr[-1])
matrix = [[1, 2], [3, 4]]
print(matrix[1][0])  # 3

Sort an almost sorted array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefSort an almost sorted array — names A→Z in the roll list.
Rulen log n vs n²
Trapunstable sort when equal keys matter
Usethe roll list

Sort an almost sorted array

Example

Short notes

Questions

Sort an almost sorted array

Example

Short notes

Questions