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1. New Array of Squares2. New Array with Only Even Elements3. Replace Negatives with 04. Replace Evens with 1, Odds with 05. Swap First & Last Elements6. Reverse Array7. Rotate Left by 18. Rotate Right by 19. Swap Alternate Elements10. Copy Array Manually

Swap Alternate Elements

Swap alternate elements in array.

IntermediatePhase 4 - Level 3: TransformationExample 9 of 10
swap-alternate-elements.py
1# Take array
2n = int(input("Enter array size: "))
3arr = []
4for i in range(n):
5    arr.append(int(input(f"Element {i+1}: ")))
6

7# Swap alternate
8for i in range(0, len(arr) - 1, 2):
9    arr[i], arr[i + 1] = arr[i + 1], arr[i]
10

11print(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]

What's going on

Swap pairs of adjacent elements.

Key Concepts:

Loop with step 2
Swap arr[i] with arr[i+1]
Process pairs

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