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class Solution(object):
    def isSameTree(self, p, q):
        """
        :type p: TreeNode
        :type q: TreeNode
        :rtype: bool
        """
        
        if not p and not q:
            return True;
        elif not p or not q:
            return False;
        elif p.val != q.val:
            return False;
        else:
            return self.isSameTree(p.left,q.left) and self.isSameTree(p.right,q.right);

/**
 * 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;
        else if(p == null || q == null) return false;
        else if(p.val != q.val) return false;
        else return isSameTree(p.left, q.left) && isSameTree(p.right, q.right);
    }
}