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Google Software Engineer Interview Question

I interviewed in New York, NY and was asked:
"The question was on n-ary tree data stream. Not unexpected, but there was a misunderstanding between myself and the interviewer. The question is to find the head of the tree given a data stream of key value pairs."
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Answers & Comments

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think of the tree as an acyclic graph, use dfs to obtain topological order, head of the tree is the first node in topological order

- Cathy Liu on Jun 8, 2014

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