问题描述
解法
分析
Python 实现
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
|
class : def isSameTree(self, p, q): """ :type p: TreeNode :type q: TreeNode :rtype: bool """ if p is None and q is None: return True if (p is None and q is not None) or (p is not None and q is None): return False if p.val != q.val: return False if self.isSameTree(p.left, q.left): return self.isSameTree(p.right, q.right) return False
|
Java 实现
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
|
* Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ class { public boolean isSameTree(TreeNode p, TreeNode q) { if(p==null && q==null){ return true; } if((p==null && q!=null) || (p!=null && q==null)){ return false; } if(p.val != q.val){ return false; } if(isSameTree(p.left, q.left)){ return isSameTree(p.right, q.right); } return false; } }
|
时间复杂度
O(n).
空间复杂度
O(1).
链接
100. Same Tree
100. 相同的树
(English version) Algorithm Notes: Leetcode#100 Same Tree
近期评论