Largest Number

class Solution:
    def largestNumber(self, nums):
        # Custom sorting function to compare two numbers as strings
        def compare(x, y):
            return int(x + y) - int(y + x)

        # Convert each numbers in nums to strings
        str_nums = [str(num) for num in nums]

        # Sort the strings using the custom comparison function
        str_nums.sort(key=cmp_to_key(compare), reverse=True)
        res = ''.join(str_nums) # Concatenate the sorted strings
        res = res.lstrip('0') # Remove leading zeros

        # If the result is an empty string, return '0'
        return res if res else '0'