在Citadel这样的顶尖科技与金融公司，技术面试以其高难度和严谨的追问而闻名。面试不仅考察候选人的算法与数据结构能力，还要求其在紧张的时间限制下清晰表达思路，并应对复杂的追问情景。以下将通过还原一道真实Citadel面试题的全过程，展现CSOAHELP如何帮助候选人保持自信并顺利应对。 面试官提出了如下问题： "There is a directed graph of n nodes

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