DSA · Theory

Sort an Array in Wave Form

Theory

605/810

Sort an Array in Wave Form

Sort an Array in Wave Form 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 Array in Wave Form.

From the example next to this theory: Sort an Array in Wave Form — 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 Array in Wave Form? 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 Array in Wave Form? 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 Array in Wave Form — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefSort an Array in Wave Form — 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 Array in Wave Form

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Theory

605/810

Sort an Array in Wave Form

Sort an Array in Wave Form 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 Array in Wave Form.

From the example next to this theory: Sort an Array in Wave Form — 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 Array in Wave Form? 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 Array in Wave Form? 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 Array in Wave Form — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

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

Sort an Array in Wave Form

Example

Short notes

Questions

Sort an Array in Wave Form

Example

Short notes

Questions