# Python: Reorder numbers in increasing/decreasing order based on whether the first plus last element is even/odd

## Python Programming Puzzles: Exercise-75 with Solution

Write a Python program to reorder numbers from a given array in increasing/decreasing order based on whether the first plus last element is odd/even.

Input: [3, 7, 4] Output: [3, 4, 7] Input: [2, 7, 4] Output: [7, 4, 2] Input: [1, 5, 6, 7, 4, 2, 8] Output: [1, 2, 4, 5, 6, 7, 8] Input: [1, 5, 6, 7, 4, 2, 9] Output: [9, 7, 6, 5, 4, 2, 1]

**Visual Presentation:**

**Sample Solution:**

**Python Code:**

```
# License: https://bit.ly/3oLErEI
# Define a function named 'test' that takes a list of numbers as input
def test(nums):
# Use the sorted function to reorder the numbers based on whether the sum of the first and last element is odd/even
return sorted(nums, reverse=(False if (nums[0] + nums[-1]) % 2 else True))
# Print a message indicating the purpose of the code
print("Reorder numbers of a given array in increasing/decreasing order based on whether the first plus last element is odd/even.")
# Example 1
nums1 = [3, 7, 4]
print("\nList of numbers:", nums1)
print("Result:")
print(test(nums1))
# Example 2
nums2 = [2, 7, 4]
print("\nList of numbers:", nums2)
print("Result:")
print(test(nums2))
# Example 3
nums3 = [1, 5, 6, 7, 4, 2, 8]
print("\nList of numbers:", nums3)
print("Result:")
print(test(nums3))
# Example 4
nums4 = [1, 5, 6, 7, 4, 2, 9]
print("\nList of numbers:", nums4)
print("Result:")
print(test(nums4))
```

Sample Output:

Reorder numbers of a give array in increasing/decreasing order based on whether the first plus last element is odd/even.: List of numbers: [3, 7, 4] Result: [3, 4, 7] List of numbers: [2, 7, 4] Result: [7, 4, 2] List of numbers: [1, 5, 6, 7, 4, 2, 8] Result: [1, 2, 4, 5, 6, 7, 8] List of numbers: [1, 5, 6, 7, 4, 2, 9] Result: [9, 7, 6, 5, 4, 2, 1]

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