Ref
[1] https://leetcode.com/problems/minimum-height-trees/
OJ
[2] https://leetcode.com/discuss/71656/c-solution-o-n-time-o-n-space
[1] https://leetcode.com/problems/minimum-height-trees/
OJ
[2] https://leetcode.com/discuss/71656/c-solution-o-n-time-o-n-space
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