Logic Building
# Take array
n = int(input("Enter array size: "))
arr = []
for i in range(n):
arr.append(int(input(f"Element {i+1}: ")))
# Reverse array
print(f"Original: {arr}")
for i in range(len(arr) // 2):
arr[i], arr[len(arr) - 1 - i] = arr[len(arr) - 1 - i], arr[i]
print(f"Reversed: {arr}")Output
Enter array size: 5 Element 1: 1 Element 2: 2 Element 3: 3 Element 4: 4 Element 5: 5 Original: [1, 2, 3, 4, 5] Reversed: [5, 4, 3, 2, 1]
Swap elements from both ends.
Key Concepts:
- Swap arr[i] with arr[len-1-i]
- Loop only to middle
- In-place reversal