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![Coding Interview Tutorial 138 - Count Complete Tree Nodes [LeetCode]](/_next/image?url=https%3A%2F%2Fi.ytimg.com%2Fvi%2F8BPKe6N8xdk%2Fhq720.jpg%3Fsqp%3D-oaymwEXCNAFEJQDSFryq4qpAwkIARUAAIhCGAE%3D%26rs%3DAOn4CLAcvzZ6QZcI0qt2hFalf3T61j6cPw&w=256&q=75)
