Kth Largest element in an array

Kth Largest element in an array is a DSA topic. In plain words you use it for a short Kth Largest element in an array example in a short dry-run on paper. Don’t start with a slogan — start with that picture.

Smallest example: the smallest Kth Largest element in an array example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Kth Largest element in an array.

From the example next to this theory: Kth Largest element in an array — arrays give O(1) index access; matrices are arrays of arrays.

Trap — only saying “Kth Largest element in an array” with no example. Fix that before you talk about advanced DSA.

Viva: what is Kth Largest element in an array? Then show the smallest Kth Largest element in an array example you can type. Then name the trap.

Diagram

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

Exam tip

What is Kth Largest element in an array? Show this: the smallest Kth Largest element in an array example you can type. Trap: only saying “Kth Largest element in an array” with no example.

Example

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

Kth Largest element in an array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefKth Largest element in an array — a short Kth Largest element in an array example in a short dry-run on paper.
Rulethe smallest Kth Largest element in an array example you can type
Traponly saying “Kth Largest element in an array” with no example
Usea short dry-run on paper

Kth Largest element in an array

Smallest example: the smallest Kth Largest element in an array example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Kth Largest element in an array.

From the example next to this theory: Kth Largest element in an array — arrays give O(1) index access; matrices are arrays of arrays.

Trap — only saying “Kth Largest element in an array” with no example. Fix that before you talk about advanced DSA.

Viva: what is Kth Largest element in an array? Then show the smallest Kth Largest element in an array example you can type. Then name the trap.

Diagram

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

Exam tip

What is Kth Largest element in an array? Show this: the smallest Kth Largest element in an array example you can type. Trap: only saying “Kth Largest element in an array” with no example.

Example

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

Kth Largest element in an array — arrays give O(1) index access; matrices are arrays of arrays.

Short notes

DefKth Largest element in an array — a short Kth Largest element in an array example in a short dry-run on paper.
Rulethe smallest Kth Largest element in an array example you can type
Traponly saying “Kth Largest element in an array” with no example
Usea short dry-run on paper

Kth Largest element in an array

Example

Short notes

Questions

Kth Largest element in an array

Example

Short notes

Questions