Logic Building
# Take array
n = int(input("Enter array size: "))
arr = []
for i in range(n):
arr.append(int(input(f"Element {i+1}: ")))
# Swap alternate
for i in range(0, len(arr) - 1, 2):
arr[i], arr[i + 1] = arr[i + 1], arr[i]
print(f"After swap: {arr}")Output
Enter array size: 6 Element 1: 1 Element 2: 2 Element 3: 3 Element 4: 4 Element 5: 5 Element 6: 6 After swap: [2, 1, 4, 3, 6, 5]
Swap pairs of adjacent elements.
Key Concepts:
- Loop with step 2
- Swap arr[i] with arr[i+1]
- Process pairs