https://leetcode-cn.com/problems/container-with-most-water/
https://leetcode-cn.com/problems/move-zeroes/
https://leetcode.com/problems/climbing-stairs/
https://leetcode-cn.com/problems/3sum/ (高频老题）
两数之和题目： https://leetcode-cn.com/problems/two-sum/

https://leetcode.com/problems/reverse-linked-list/
https://leetcode.com/problems/swap-nodes-in-pairs
https://leetcode.com/problems/linked-list-cycle
https://leetcode.com/problems/linked-list-cycle-ii
https://leetcode.com/problems/reverse-nodes-in-k-group/

https://leetcode-cn.com/problems/remove-duplicates-from-sorted-array/
https://leetcode-cn.com/problems/rotate-array/
https://leetcode-cn.com/problems/merge-two-sorted-lists/
https://leetcode-cn.com/problems/merge-sorted-array/
https://leetcode-cn.com/problems/two-sum/
https://leetcode-cn.com/problems/move-zeroes/
https://leetcode-cn.com/problems/plus-one/

https://leetcode-cn.com/problems/valid-parentheses/
https://leetcode-cn.com/problems/min-stack/
https://leetcode-cn.com/problems/largest-rectangle-in-histogram
https://leetcode-cn.com/problems/sliding-window-maximum
https://leetcode.com/problems/design-circular-deque
https://leetcode.com/problems/trapping-rain-water/

https://leetcode-cn.com/problems/valid-anagram/description/
https://leetcode-cn.com/problems/group-anagrams/
https://leetcode-cn.com/problems/two-sum/description/
https://leetcode-cn.com/problems/binary-tree-inorder-traversal/
https://leetcode-cn.com/problems/binary-tree-preorder-traversal/
https://leetcode-cn.com/problems/n-ary-tree-postorder-traversal/
https://leetcode-cn.com/problems/n-ary-tree-preorder-traversal/
https://leetcode-cn.com/problems/n-ary-tree-level-order-traversal/
https://leetcode-cn.com/problems/climbing-stairs/
https://leetcode-cn.com/problems/generate-parentheses/
https://leetcode-cn.com/problems/invert-binary-tree/description/
https://leetcode-cn.com/problems/validate-binary-search-tree
https://leetcode-cn.com/problems/maximum-depth-of-binary-tree
https://leetcode-cn.com/problems/minimum-depth-of-binary-tree
https://leetcode-cn.com/problems/serialize-and-deserialize-binary-tree/
https://leetcode-cn.com/problems/lowest-common-ancestor-of-a-binary-tree/
https://leetcode-cn.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal
https://leetcode-cn.com/problems/combinations/
https://leetcode-cn.com/problems/permutations/
https://leetcode-cn.com/problems/permutations-ii/

简单：
https://leetcode-cn.com/problems/lemonade-change/description/
https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock-ii/description/
https://leetcode-cn.com/problems/assign-cookies/description/
https://leetcode-cn.com/problems/walking-robot-simulation/description/
使用二分查找，寻找一个半有序数组 [4, 5, 6, 7, 0, 1, 2] 中间无序的地方
说明：同学们可以将自己的思路、代码写在第 3 周的学习总结中
中等：
https://leetcode-cn.com/problems/word-ladder/description/
https://leetcode-cn.com/problems/number-of-islands/
https://leetcode-cn.com/problems/minesweeper/description/
https://leetcode-cn.com/problems/jump-game/
https://leetcode-cn.com/problems/search-in-rotated-sorted-array/
https://leetcode-cn.com/problems/search-a-2d-matrix/
https://leetcode-cn.com/problems/find-minimum-in-rotated-sorted-array/
困难
https://leetcode-cn.com/problems/word-ladder-ii/description/
https://leetcode-cn.com/problems/jump-game-ii/