Given a non-empty list of integers, return a new list containing exactly two elements: the minimum value at index 0 and the maximum value at index 1. Find both values in a single pass without sorting.
Examples:
Input: nums = [3, 1, 4, 1, 5, 9, 2, 6]
Output: [1, 9]
Explanation: Minimum is 1, maximum is 9
Input: nums = [5]
Output: [5, 5]
Explanation: Single element is both minimum and maximum
Input: nums = [-3, -1, -7, 0, 2]
Output: [-7, 2]
Explanation: Minimum is -7, maximum is 2
Input: nums = [10, 10, 10]
Output: [10, 10]
Explanation: All elements equal, both min and max are 10
Input: nums = [100, 50, 75, 25]
Output: [25, 100]
Explanation: Minimum is 25, maximum is 100
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