Python: List integers containing exactly three distinct values, such that no integer repeats twice consecutively

Python Programming Puzzles: Exercise-9 with Solution

Write a Python program to find list integers containing exactly four distinct values, such that no integer repeats twice consecutively among the first twenty entries.

Note: The list needs to have length greater than ten.)

Input:
[1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
Output:
True

Input:
[1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3]
Output:
False

Input:
[1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
Output:
False

Pictorial Presentation:

Sample Solution:

Python Code:

#License: https://bit.ly/3oLErEI
def test(nums):
    return all([nums[i] != nums[i + 1] for i in range(len(nums)-1)]) and len(set(nums)) == 4
nums = [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
print("Original list:")
print(nums)
print("Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:")
print(test(nums))
nums = [1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3]
print("\nOriginal list:")
print(nums)
print("Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:")
print(test(nums))
nums = [1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
print("\nOriginal list:")
print(nums)
print("Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:")
print(test(nums))

Sample Output:

Original list:
[1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4]
Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:
True

Original list:
[1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3, 1, 2, 3, 3]
Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:
False

Original list:
[1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3, 1, 2, 3]
Check said list of integers containing exactly four distinct values, such that no integer repeats  twice consecutively:
False

Flowchart:

Visualize Python code execution:

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Python Code Editor :

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