DSA · Theory

How to Search, Insert, and Delete in an Unsorted Array

Theory

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How to Search, Insert, and Delete in an Unsorted Array

How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted Array.

From the example next to this theory: How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted 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

How to Search, Insert, and Delete in an Unsorted Array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefHow to Search, Insert, and Delete in an Unsorted Array — names A→Z in the roll list.
Rulen log n vs n²
Trapunstable sort when equal keys matter
Usethe roll list

DSA · Theory

How to Search, Insert, and Delete in an Unsorted Array

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Theory

305/810

How to Search, Insert, and Delete in an Unsorted Array

How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted Array.

From the example next to this theory: How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted 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 How to Search, Insert, and Delete in an Unsorted 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

How to Search, Insert, and Delete in an Unsorted Array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefHow to Search, Insert, and Delete in an Unsorted Array — names A→Z in the roll list.
Rulen log n vs n²
Trapunstable sort when equal keys matter
Usethe roll list

How to Search, Insert, and Delete in an Unsorted Array

Example

Short notes

Questions

How to Search, Insert, and Delete in an Unsorted Array

Example

Short notes

Questions