2025-08-20 15:54:48 +0000 UTC

class Solution:
    def findTheArrayConcVal(self, nums: List[int]) -> int:
        def concat(num1: int, num2: int) -> int:
            res = 0
            count = 0
            for num in (num2, num1):
                while num > 0:
                    res += (num % 10) * (10 ** count)
                    count += 1
                    num //= 10
            return res
        left, right = 0, len(nums) - 1
        res = 0
        while left <= right:
            num1, num2 = nums[left], nums[right]
            if left == right:
                res += num1
            else:
                res += concat(num1, num2)
            left += 1
            right -= 1
        return res