2562. Find the Array Concatenation Value

This problem is very similar to quiz 4 — both use two pointers.

I made a mistake when computing the right pointer using a negative index: right = -left + 1. It's tricky to reason about with positive indices, so I switched to right = len(nums) - 1 - left.

Code

class Solution:
    def findTheArrayConcVal(self, nums: List[int]) -> int:
        sums = 0
        for left in range(len(nums)):
            right = len(nums) - 1 - left
            if left == right:
                sums += nums[left]
                break
            elif left < right:
                sums += int(str(nums[left]) + str(nums[right]))
        return sums

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longsizhuo贡献 3 次 · 最近 2026/04/18

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2562. Find the Array Concatenation Value

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