DSA · Theory

Program for mean and median of an unsorted array

Theory

736/810

Program for mean and median of an unsorted array is a DSA idea you prove with names A→Z, not with a slogan.

Program for mean and median of an unsorted array on the board: n log n vs n². Then say what names A→Z looks like after.

Skip Program for mean and median of an unsorted array and unstable sort when equal keys matter shows up in the roll list.

Use Program for mean and median of an unsorted array when names A→Z must stay clear. If a simpler DSA step works, use that instead.

Program for mean and median of an unsorted array miss: unstable sort when equal keys matter. Fix it before you talk about advanced DSA.

Place Program for mean and median of an unsorted array next to nearby DSA work — n log n vs n² is the link.

Close Program for mean and median of an unsorted array with: “If I skip it, names A→Z goes wrong like this: unstable sort when equal keys matter.”

Diagram

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

Exam tip

Say Program for mean and median of an unsorted array in one breath, then n log n vs n², then unstable sort when equal keys matter.

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

Program for mean and median of an unsorted array — arrays give O(1) index access; matrices are arrays of arrays.

DefProgram for mean and median of an unsorted array — Riya uses it for names A→Z in the roll list.
RuleProgram for mean and median of an unsorted array → n log n vs n².
RememberProgram for mean and median of an unsorted array + a dry-run table (the roll list).
UseProgram for mean and median of an unsorted array in the roll list (names A→Z).
TrapProgram for mean and median of an unsorted array — unstable sort when equal keys matter.
ExProgram for mean and median of an unsorted array → names A→Z.