During his long sea voyages, Captain Cook was often absent in the evenings and eventually the crew began to joke that he must have a mistress in his cabin. When they discovered that the Captain had simply been playing this game with the ship s scien

关于二叉树的插入，先序遍历，后序遍历，中序遍历，叶子节点个数，树的深度，路径查找。-Binary tree insertion, preorder, postorder traversal, preorder, the number of leaf nodes, the depth of the tree, the path to find.