Leetcode 951. Flip Equivalent Binary Trees (二叉树翻转题)
FlipEquivalentBinaryTreesSolvedMediumTopicsCompaniesForabinarytreeT,wecandefineaflipoperationasfollows:chooseanynode,andswaptheleftandrightchildsubtrees.AbinarytreeXisflipequivalenttoabinarytreeYifand