算法

62.不同路径 https://leetcode.com/problems/unique-paths/description/ 不同路径 II https://leetcode.com/problem

斐波那契数 https://leetcode.com/problems/fibonacci-number/description/ 爬楼梯 https://leetcode.com/problems/

合并区间 https://leetcode.com/problems/merge-intervals/description/ 738.单调递增的数字 https://leetcode.com/pro

用最少数量的箭引爆气球 https://leetcode.com/problems/minimum-number-of-arrows-to-burst-balloons/description/ 无重

加油站 https://leetcode.com/problems/gas-station/description/ 分发糖果 https://leetcode.com/problems/candy/

122.买卖股票的最佳时机 II https://leetcode.com/problems/best-time-to-buy-and-sell-stock-ii/description/ 跳跃游戏

455.分发饼干 https://leetcode.com/problems/assign-cookies/description/ 摆动序列 https://leetcode.com/problem

491.递增子序列 https://leetcode.com/problems/non-decreasing-subsequences/description/ 46.全排列 https://leet

93.复原IP地址 https://leetcode.com/problems/restore-ip-addresses/description/ 思路：还是切割字符串 78.子集 https://l

组合总和 https://leetcode.com/problems/combination-sum/description/ 思路：跟第一个题基本一样，就是元素可以重复用 40.组合总和II htt

组合 https://leetcode.com/problems/combinations/ 思路：组合排列这种都是经典题目了 216.组合总和III https://leetcode.com/pro

修剪二叉搜索树 https://leetcode.com/problems/trim-a-binary-search-tree/description/ 思路：主要还是递归的能力 108.将有序数组转

二叉搜索树的最近公共祖先 https://leetcode.com/problems/lowest-common-ancestor-of-a-binary-search-tree/descriptio

530.二叉搜索树的最小绝对差 https://leetcode.com/problems/minimum-absolute-difference-in-bst/description/ 501.二叉

654.最大二叉树 https://leetcode.com/problems/maximum-binary-tree/ 思路：构造二叉树题目 617.合并二叉树 https://leetcode.c

513.找树左下角的值 https://leetcode.com/problems/find-bottom-left-tree-value/description/ 思路：要走到最下面一行找最左边的节

222.完全二叉树的节点个数 https://leetcode.com/problems/count-complete-tree-nodes/submissions/1338509885/ 思路：递归

226.翻转二叉树 https://leetcode.com/problems/invert-binary-tree/description/ 104.二叉树的最大深度 https://leetcod

144.二叉树的前序遍历 思路：这几道题都是用递归代码是比较简单的 迭代法： 145.二叉树的后序遍历 94.二叉树的中序遍历

逆波兰表达式求值 https://leetcode.com/problems/evaluate-reverse-polish-notation/description/