Logic Building
# Take array
n = int(input("Enter array size: "))
arr = []
for i in range(n):
arr.append(int(input(f"Element {i+1}: ")))
# Get unique elements
unique_arr = []
seen = set()
for element in arr:
if element not in seen:
unique_arr.append(element)
seen.add(element)
print(f"Original: {arr}")
print(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]
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