Given two binary trees, write a function to check if they are equal or not. Two binary trees are considered equal if they are structurally identical and the nodes have the same value. 给出两个二叉树,写一个方法判断两个二叉树是否相等, 如果两个二叉树相等,说明结构相同并且每个节点的值相同. 如果两个节点都为空,则说…