Design a data structure that, given an initial list and a stream of added numbers, returns the first integer that appears exactly once at any time. The core challenge is maintaining element frequencies while preserving insertion order so queries for the current first unique remain efficient.
Use esses exemplos para entender em que contexto ela costuma cair e adaptar sua prática.
Got this question on the Depth in Specialization interview. It was phrased as a system to keep track of recurrent visitors vs one time visitors. Should implement two methods: one to post a visit and other to get the first one time visitor.
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