Python
# Program to flatten a nested list (one level)
items = eval(input("Enter a nested list (e.g., [[1, 2], [3, 4]]): "))
flattened = [elem for sublist in items for elem in sublist]
print("Flattened list:", flattened)Output
Enter a nested list (e.g., [[1, 2], [3, 4]]): [[1, 2], [3, 4]] Flattened list: [1, 2, 3, 4]
We use a nested list comprehension to iterate over sublists and their elements.