leetCode--same-tree

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.

分析：很简单，先比较父节点是否相同，在比较各自的子节点即可

public class Solution {    public boolean isSameTree(TreeNode p, TreeNode q) {        if(p==null&&q==null){            return true;        }        if(p==null||q==null){            return false;        }        return p.val==q.val&&isSameTree(p.left,q.left)&&isSameTree(p.right,q.right);    }}