1. Spring简介
1.1 Spring 核心设计思想
1.1.1 Spring 是什么? Spring 是包含了众多⼯具⽅法的 IoC 容器。Spring 指的是 Spring Framework(Spring 框架),它是⼀个开源框架,Spring ⽀持⼴泛的应⽤场景,它…
解题思路:
class Solution {List<TreeNode> list new ArrayList<>();public void flatten(TreeNode root) {recur(root);for (int i 1; i < list.size(); i) {TreeNode pre list.get(i - 1);TreeNode cur list.get(i);pre.left null;pre.right…
题目: 题解:
class Solution:def permute(self, nums):""":type nums: List[int]:rtype: List[List[int]]"""def backtrack(first 0):# 所有数都填完了if first n: res.append(nums[:])for i in range(first, n):# 动…