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An Eulerian trail (or Eulerian path) is a path in a graph that visits every edge exactly once. Given a directed graph, check whether it has an Eulerian path or not.

Check if removing an edge can split a binary tree into two equal size trees

Given a binary tree, check if removing an edge can split it into two binary trees of equal size.

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Given two height-balanced binary search trees, in-place merge them into a single balanced binary search tree. For each node of a height-balanced tree, the difference between its left and right subtree height is at most 1.