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输入:root = [5,4,8,11,null,13,4,7,2,null,null,5,1], targetSum = 22输出:[[5,4,11,2],[5,8,4,5]] 示例2: 输入:root = [1,2,3], targetSum = 5输出:[] 示例3: 输入:root = [1,2], targetSum = 0输出:[] 提示: ...
你可以定义 null 是叶子,也可以定义叶子不能是 null(而是左右子树为 null),怎么定义都可以。但是,定义不同,代码就跟着变了。不同的定义,都能导向正确的代码。 继续加油!:) 0 回复 相似问题叶子节点定义 2735 0 2 2-3树叶子节点是否为空? 955 0 5 关于B-tree叶子节点的问题 1062 0 4 8:20 秒...
1classSolution(object):2defthreeSum(self, nums):3"""4:type nums: List[int]5:rtype: List[List[int]]6"""7nums.sort()#根据python的内置列表排序,实现排序8result =list()9iflen(nums) < 3:10returnresult#判断,如果输入列表小于3,直接返回空值11foriinrange(len(nums) - 2):#只能遍历到len(...
源自:5-3 LeetCode:206.反转链表 835 分享 收起 1回答 lewis 2020-08-05 18:46:28 那只是简写,仔细看下课程里面的链表 0 回复 i杨永安 #1 也就是说 LeetCode 上使用数组描述链表的时候,[1,2]默认是 [{val:1,next:2},{val:2,next:null}]这样吗 回复 2020-09-07 08:58:24 德育处...
Simple simulation with follow up question 代码语言:javascript 代码运行次数:0 运行 AI代码解释 1publicintreverseBits(int n){2int res=0;34for(int i=0;i<32;i++){5int t=n&1;6n=n>>1;7res=res<<1;8res=res|t;910}11returnres;12// return Integer.reverse(n);13}1415publicintreverseBits...
Question The set [1,2,3,…,n] contains a total of n! unique permutations. By listing and labeling all of the permutations in order, We get the following sequence (ie, for n = 3): “123” “132” “213” “231” “312”
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输入:l1 = [2,4,3], l2 = [5,6,4]输出:[7,0,8]解释:342 + 465 = 807. 示例2: 输入:l1 = [0], l2 = [0]输出:[0] 示例3: 输入:l1 = [9,9,9,9,9,9,9], l2 = [9,9,9,9]输出:[8,9,9,9,0,0,0,1] 提示: ...
输入:head = [1,2,3,4,5] 输出:[5,4,3,2,1] 示例2: 输入:head = [1,2] 输出:[2,1] 示例3: 输入:head = [] 输出:[] 提示: 链表中节点的数目范围是 [0, 5000] -5000 <= Node.val <= 5000 进阶:链表可以选用迭代或递归方式完成反转。你能否用两种方法解决这道题?通过...