[100]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.

思路

迭代，依次判断每个子树看两棵树是否相同。

Code

Java

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) && isSameTree(p.left, q.left) && isSameTree(p.right, q.right))
            return true;
        else
            return false;
    }
}