There is an integer array nums that consists of n unique elements, but you have forgotten it. However, you do remember every pair of adjacent elements in nums.
You are given a 2D integer array adjacentPairs of size n - 1 where each adjacentPairs[i] = [ui, vi] indicates that the elements ui and vi are adjacent in nums.
It is guaranteed that every adjacent pair of elements nums[i] and nums[i+1] will exist in adjacentPairs, either as [nums[i], nums[i+1]] or [nums[i+1], nums[i]]. The pairs can appear in any order.
Return the original array nums. If there are multiple solutions, return any of them.
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Example 1:
\n\n\nInput: adjacentPairs = [[2,1],[3,4],[3,2]]\nOutput: [1,2,3,4]\nExplanation: This array has all its adjacent pairs in adjacentPairs.\nNotice that adjacentPairs[i] may not be in left-to-right order.\n\n\n
Example 2:
\n\n\nInput: adjacentPairs = [[4,-2],[1,4],[-3,1]]\nOutput: [-2,4,1,-3]\nExplanation: There can be negative numbers.\nAnother solution is [-3,1,4,-2], which would also be accepted.\n\n\n
Example 3:
\n\n\nInput: adjacentPairs = [[100000,-100000]]\nOutput: [100000,-100000]\n\n\n
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Constraints:
\n\nnums.length == nadjacentPairs.length == n - 1adjacentPairs[i].length == 22 <= n <= 105-105 <= nums[i], ui, vi <= 105nums that has adjacentPairs as its pairs.Compiled with clang 11 using the latest C++ 17 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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