# 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 a list of 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

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