Python
# Program to remove duplicates from a list while preserving order
items = input("Enter list elements separated by space: ").split()
seen = set()
result = []
for x in items:
if x not in seen:
seen.add(x)
result.append(x)
print("List without duplicates:", result)Output
Enter list elements separated by space: 1 2 2 3 1 List without duplicates: ['1', '2', '3']
We track seen elements in a set and only append new items to the result list to keep the first occurrence.