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1506. Find Root of N-Ary Tree You are given all the nodes of an N-ary tree as an array of Node objects, where each node has a unique value. Return the root of the N-ary tree. Custom testing: An N-ary tree can be serialized as represented in its level order traversal where each group of children is separated by the null value (see examples). For example, the above tree is serialized as [1,null,2,3,4,5,null,null,6,7,null,8,null,9,10,null,null,11,null,12,null,13,null,null,14]. The testing will be ...