[코테 연습] All Elements in Two Binary Search Trees

leetcode.com/problems/all-elements-in-two-binary-search-trees/

All Elements in Two Binary Search Trees - LeetCode

Given two binary search trees root1 and root2.

Return a list containing all the integers from both trees sorted in ascending order.

 

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아예 트리를 주지 않는 경우가 있었다.. ㄴㅇㄱ