Next
1. Check if Array is Sorted (Ascending)2. Check if Array is Sorted (Descending)3. Find Second Largest4. Find Second Smallest5. Range (Max - Min)6. Sum Except Max & Min7. Count Pairs with Sum K8. Count Elements Greater Than Average9. Frequency of Distinct Elements10. Unique Elements Only11. Find Kth Largest Element12. Rotate Array by K Positions13. Find Missing Number in Sequence14. Find Duplicate Element

Unique Elements Only

Create array with only unique elements.

AdvancedPhase 4 - Level 5: Logical & AppliedExample 10 of 14
unique-elements-only.py
1# Take array
2n = int(input("Enter array size: "))
3arr = []
4for i in range(n):
5    arr.append(int(input(f"Element {i+1}: ")))
6

7# Get unique elements
8unique_arr = []
9seen = set()
10for element in arr:
11    if element not in seen:
12        unique_arr.append(element)
13        seen.add(element)
14

15print(f"Original: {arr}")
16print(f"Unique elements: {unique_arr}")

Output

Enter array size: 6
Element 1: 1
Element 2: 2
Element 3: 2
Element 4: 3
Element 5: 1
Element 6: 4
Original: [1, 2, 2, 3, 1, 4]
Unique elements: [1, 2, 3, 4]

What's going on

Keep only first occurrence of each element.

Key Concepts:

Use set to track seen elements
Add to result if not seen
Preserves order of first occurrence

🔗Related Content

PreviousFrequency of Distinct ElementsNextFind Kth Largest Element