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Challenge # 4

Find the Second-Largest Number

Objective

Identify the second-largest number from a list of integers.

You are given a list of integers named nums.
Write a function second_largest(nums) that returns the second-largest number in the list.
Assume the list contains at least two distinct numbers.
Do not use built-in sorting methods like sort() or sorted().
Your solution should work efficiently even for large lists.

Constraints:

Do not use input(). • Assume the list contains at least two distinct elements. • Do not use built-in sort functions like `sort()` or `sorted()`.

Exemple IO

Input: nums = [4, 1, 7, 3, 9, 2]
Output: 7

Input: nums = [10, 20, 5, 20, 8]
Output: 10

Input: nums = [-1, -5, -3, -4]
Output: -3

Output:

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