- LeetCode 001 Two Sum
- LeetCode 015 3Sum(可能会问 LeetCode18.4Sum思路)
- LeetCode 020 Valid Parentheses
- LeetCode 021 Merge Two Sorted Lists
- LeetCode 025 Reverse Nodes in k-group
- LeetCode 053 Maximum Subarra
- LeetCode 066 Plus One(等介于:高精度加加法)
- LeetCode 098 Validate Binary Search Tree
- LeetCode 110 Balanced Binary Tree
- LeetCode 134 Gas Station
- LeetCode 136 Single Number
- LeetCode 137 Single Number II
- LeetCode 146 LRU Cache(变形题:带有过期时间的LRU缓存)（Map + 链表）
- LeetCode 206 Reverse Linked List（递归、迭代）
- LeetCode 215 Kth Largest Element in an Array(等价于:快速排序)
- LeetCode 232 Implement Queue using Stacks(每次将新来的元素放到栈底，stack.push())
- LeetCode 328 Odd Even Linked List
- LeetCode 415 Add Strings(等价于:大数加法)
- LeetCode 470 rand70rand100
- LeetCode 496 Next Greater Element I(时间复杂度O(n)(单调栈，使用 Map 映射 stack 的指定位置)
- LeetCode 716 Max Stack(两个栈实现最大栈,要求pop,push, get max都为0(1)
- LeetCode 860 Lemonade Change