Find largest element in an unsorted array
Implement find_largest(nums) to return the largest integer in a non-empty array. Scan the array without sorting it.
Input: nums, a non-empty list of integers. Output: the largest integer.
Examples: find_largest([3, 1, 7, 2]) returns 7; find_largest([-5, -2, -9]) returns -2.
Constraints: 1 <= len(nums) <= 10^4; values range from -10^9 to 10^9.
def find_largest(nums):