DSA · Theory

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

Theory

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If you can teach How to Search, Insert, and Delete in an Unsorted Array using names A→Z, you know it. If you only know the heading, you don’t.

How to Search, Insert, and Delete in an Unsorted Array on the board: n log n vs n². Then say what names A→Z looks like after.

Without How to Search, Insert, and Delete in an Unsorted Array, the roll list gets messy and names A→Z is hard to trust.

Use How to Search, Insert, and Delete in an Unsorted Array when names A→Z must stay clear. If a simpler DSA step works, use that instead.

How to Search, Insert, and Delete in an Unsorted Array miss: unstable sort when equal keys matter. Fix it before you talk about advanced DSA.

After How to Search, Insert, and Delete in an Unsorted Array, Sara should still remember unstable sort when equal keys matter.

Viva for How to Search, Insert, and Delete in an Unsorted Array: what it is → n log n vs n² → the mistake (unstable sort when equal keys matter).

Diagram

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

Exam tip

For How to Search, Insert, and Delete in an Unsorted Array: definition + the roll list + one failure.

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.

DefHow to Search, Insert, and Delete in an Unsorted Array — Sara uses it for names A→Z in the roll list.
RuleHow to Search, Insert, and Delete in an Unsorted Array → n log n vs n².
RememberHow to Search, Insert, and Delete in an Unsorted Array + time vs memory (the roll list).
UseHow to Search, Insert, and Delete in an Unsorted Array in the roll list (names A→Z).
TrapHow to Search, Insert, and Delete in an Unsorted Array — unstable sort when equal keys matter.
ExHow to Search, Insert, and Delete in an Unsorted Array → names A→Z.