100. Same Tree

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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.

/** * Definition for a binary tree node. * public class TreeNode { *     int val; *     TreeNode left; *     TreeNode right; *     TreeNode(int x) { val = x; } * } */public class Solution {    public boolean isSameTree(TreeNode p, TreeNode q) {        if (p == null && q == null)            return true;        if (p == null || q == null)            return false;        if (p.val != q.val)            return false;        return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);    }}
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