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# LeetCode题目分类与面试问题整理
# LeetCode topic classification and interview questions collation
## 题目分类
## Subject category
### Hash相关
### Hash related
* [q1_两数之和](/src/hash相关/q1_两数之和)
* [q387_字符串中的第一个唯一字符](/src/hash相关/q387_字符串中的第一个唯一字符)
- [q1_sum of two numbers](/src/hash related/q1_sum of two numbers)
- [q387_the first unique character in the string] (/src/hash related/q387\_ the first unique character in the string)
### 链表操作
### Linked list operation
* [q2_两数相加](/src/链表操作/q2_两数相加)
* [q19_删除链表的倒数第N个节点](/src/链表操作/q19_删除链表的倒数第N个节点)
* [q25_k个一组翻转链表](/src/链表操作/q25_k个一组翻转链表)
* [q61_旋转链表](/src/链表操作/q61_旋转链表)
* [q138_复制带随机指针的链表](/src/链表操作/q138_复制带随机指针的链表)
* [q206_反转链表](/src/链表操作/q206_反转链表)
- [q2_Add two numbers](/src/Link list operation/q2_Add two numbers)
- [q19_delete the Nth node from the bottom of the linked list](/src/list operation/q19_delete the Nth node from the bottom of the linked list)
- [q25_k set of flipped linked lists] (/src/linked list operation/q25_k set of flipped linked lists)
- [q61_rotating linked list](/src/linked list operation/q61_rotating linked list)
- [q138_copy linked list with random pointer](/src/linked list operation/q138_copy linked list with random pointer)
- [q206_reverse linked list](/src/linked list operation/q206_reverse linked list)
### 双指针遍历/滑动窗口
### Double pointer traversal/sliding window
* [q3_无重复字符的最长子串](/src/双指针遍历/q3_无重复字符的最长子串)
* [q11_盛最多水的容器](/src/双指针遍历/q11_盛最多水的容器)
* [q15_三数之和](/src/双指针遍历/q15_三数之和)
* [q16_最接近的三数之和](/src/双指针遍历/q16_最接近的三数之和)
* [q26_删除排序数组中的重复项](/src/双指针遍历/q26_删除排序数组中的重复项)
* [q42_接雨水](/src/双指针遍历/q42_接雨水)
* [q121_买卖股票的最佳时机](/src/双指针遍历/q121_买卖股票的最佳时机)
* [q209_长度最小的子数组](/src/双指针遍历/q209_长度最小的子数组)
- [q3_Longest substring without repeated characters] (/src/Double pointer traversal/q3_Longest substring without repeated characters)
- [q11_Container with the most water](/src/Double pointer traversal/q11_Container with the most water)
- [q15_sum of three numbers](/src/double pointer traversal/q15_sum of three numbers)
- [q16_closest sum of three numbers](/src/dual pointer traversal/q16_closest sum of three numbers)
- [q26_delete duplicates in the sorted array](/src/double pointer traversal/q26_delete duplicates in the sorted array)
- [q42_trapping-rain-water](/src/Dual pointer traversal/q42\_接雨水)
- [q121_The best time to buy and sell stocks] (/src/Dual pointer traversal/q121_The best time to buy and sell stocks)
- [q209_The smallest length sub-array](/src/Double pointer traversal/q209_The smallest length sub-array)
### 快慢指针遍历
### Fast and slow pointer traversal
* [q141_环形链表](/src/快慢指针遍历/q141_环形链表)
* [q202_快乐数](/src/快慢指针遍历/q202_快乐数)
* [q876_链表的中间结点](/src/快慢指针遍历/q876_链表的中间结点)
- [q141_circular linked list](/src/fast and slow pointer traversal/q141_circular linked list)
- [q202_happy number](/src/speed pointer traversal/q202_happy number)
- [q876_intermediate node of linked list] (/src/fast/slow pointer traversal/q876_intermediate node of linked list)
### 区间合并
### Interval merge
* [q56_合并区间](/src/区间合并/q56_合并区间)
- [q56_Merge interval](/src/Merge interval/q56_Merge interval)
### 字符串操作
### String manipulation
* [q6_Z字形变换](/src/字符串操作/q6_Z字形变换)
* [q14_最长公共前缀](/src/字符串操作/q14_最长公共前缀)
* [q763_划分字母区间](/src/字符串操作/q763_划分字母区间)
- [q6_Zigzag transformation](/src/String operation/q6_Zigzag transformation)
- [q14_longest common prefix](/src/string operation/q14_longest common prefix)
- [q763_Dividing letter interval](/src/String operation/q763_Dividing letter interval)
### 数字操作
### Digital operation
* [q7_整数反转](/src/数字操作/q7_整数反转)
* [q8_字符串转换整数](/src/数字操作/q8_字符串转换整数)
* [q9_回文数](/src/数字操作/q9_回文数)
* [q43_字符串相乘](/src/数字操作/q43_字符串相乘)
* [q172_阶乘后的零](/src/数字操作/q172_阶乘后的零)
* [q258_各位相加](/src/数字操作/q258_各位相加)
- [q7_integer inversion](/src/digital operation/q7_integer inversion)
- [q8_string conversion integer](/src/number operation/q8_string conversion integer)
- [q9_Palindrome Number](/src/Number Operation/q9_Palindrome Number)
- [q43_string multiplication](/src/number operation/q43_string multiplication)
- [q172_zero after factorial](/src/digital operation/q172_zero after factorial)
- [q258_Add everybody](/src/Digital operation/q258_Add everybody)
### 数组操作
### Array operations
* [q54_螺旋矩阵](/src/数组操作/q54_螺旋矩阵)
* [q73_矩阵置零](/src/数组操作/q73_矩阵置零)
* [q78_子集](/src/数组操作/q78_子集)
* [q384_打乱数组](/src/数组操作/q384_打乱数组)
* [q581_最短无序连续子数组](/src/数组操作/q581_最短无序连续子数组)
* [q945_使数组唯一的最小增量](/src/数组操作/q945_使数组唯一的最小增量)
- [q54_spiral matrix](/src/array operation/q54_spiral matrix)
- [q73_Zero Matrix](/src/Array Operation/q73_Zero Matrix)
- [q78_subset](/src/array operation/q78_subset)
- [q384_scrambling array](/src/array operation/q384_scrambling array)
- [q581_shortest unordered continuous subarray](/src/array operation/q581_shortest unordered continuous subarray)
- [q945_Minimum increment to make the array unique] (/src/Array operation/q945_Minimum increment to make the array unique)
### 栈相关
### Stack related
* [q20_有效的括号](/src/栈相关/q20_有效的括号)
* [q32_最长有效括号](/src/栈相关/q32_最长有效括号)
* [q155_最小栈](/src/栈相关/q155_最小栈)
* [q224_基本计算器](/src/栈相关/q224_基本计算器)
* [q232_用栈实现队列](/src/栈相关/q232_用栈实现队列)
* [q316_去除重复字母](/src/栈相关/q316_去除重复字母)
- [q20_valid brackets](/src/stack related/q20_valid brackets)
- [q32_longest valid bracket](/src/stack related/q32_longest valid bracket)
- [q155_Minimal stack](/src/stack related/q155_Minimal stack)
- [q224_basic calculator](/src/stack related/q224_basic calculator)
- [q232_implement queue with stack](/src/stack related/q232_implement queue with stack)
- [q316_remove duplicate letters](/src/stack related/q316_remove duplicate letters)
### 堆相关
### Heap related
* [q215_数组中的第K个最大元素](/src/堆相关/q215_数组中的第K个最大元素)
* [q347_前K个高频元素](/src/堆相关/q347_前K个高频元素)
- [q215_the Kth largest element in the array] (/src/heap-related/q215_the Kth largest element in the array)
- [q347_top K high frequency elements](/src/heap related/q347_top K high frequency elements)
### 递归
### Recursion
* [q21_合并两个有序链表](/src/递归/q21_合并两个有序链表)
* [q101_对称二叉树](/src/递归/q101_对称二叉树)
* [q104_二叉树的最大深度](/src/递归/q104_二叉树的最大深度)
* [q226_翻转二叉树](/src/递归/q226_翻转二叉树)
* [q236_二叉树的最近公共祖先](/src/递归/q236_二叉树的最近公共祖先)
- [q21_merge two ordered linked lists](/src/recursion/q21_merge two ordered linked lists)
- [q101_symmetric binary tree](/src/recursion/q101_symmetric binary tree)
- [q104_Maximum Depth of Binary Tree](/src/Recursion/q104_Maximum Depth of Binary Tree)
- [q226_flip binary tree](/src/recursion/q226_flip binary tree)
- [q236_The nearest common ancestor of the binary tree](/src/recursion/q236_The nearest common ancestor of the binary tree)
### 分治法/二分法
### Divide and Conquer/Dichotomy
* [q23_合并K个排序链表](/src/分治法/q23_合并K个排序链表)
* [q33_搜索旋转排序数组](/src/分治法/q33_搜索旋转排序数组)
* [q34_在排序数组中查找元素的第一个和最后一个位置](/src/分治法/q34_在排序数组中查找元素的第一个和最后一个位置)
-[q23\_Merge K sorted lists](/src/divide and conquer/q23_Merge K sorted lists) -[q33\_Search rotating sorted array](/src/divide and conquer/q33_search rotating sorted array) -[q34\_Find the first and last position of an element in the sorted array](/src/divide and conquer/q34_Find the first and last position of an element in the sorted array)
### 动态规划
### Dynamic Planning
* [q5_最长回文子串](/src/动态规划/q5_最长回文子串)
* [q53_最大子序和](/src/动态规划/q53_最大子序和)
* [q62_不同路径](/src/动态规划/q62_不同路径)
* [q64_最小路径和](/src/动态规划/q64_最小路径和)
* [q70_爬楼梯](/src/动态规划/q70_爬楼梯)
* [q118_杨辉三角](/src/动态规划/q118_杨辉三角)
* [q300_最长上升子序列](/src/动态规划/q300_最长上升子序列)
* [q1143_最长公共子序列](/src/动态规划/q1143_最长公共子序列)
* [q1277_统计全为1的正方形子矩阵](/src/动态规划/q1277_统计全为1的正方形子矩阵)
-[q5\_longest palindrome substring](/src/dynamic programming/q5*longest palindrome substring) -[q53\_Maximum Subsequence Sum](/src/Dynamic Programming/q53_Max Subsequence Sum) -[q62\_different path](/src/dynamic programming/q62_different path) -[q64\_Minimum path sum](/src/dynamic programming/q64_Minimum path sum) -[q70\_stair climbing](/src/dynamic programming/q70_stair climbing) -[q118\_杨辉 Triangle](/src/Dynamic Programming/q118*杨辉 Triangle) -[q300\_Longest Ascending Subsequence](/src/Dynamic Programming/q300_Longest Ascending Subsequence) -[q1143\_longest common subsequence](/src/dynamic programming/q1143_longest common subsequence) -[q1277\_square submatrix with all 1s](/src/dynamic programming/q1277_square submatrix with all 1s)
### 回溯法
### Backtracking
* [q10_正则表达式匹配](/src/回溯法/q10_正则表达式匹配)
* [q22_括号生成](/src/回溯法/q22_括号生成)
* [q40_组合总和2](/src/回溯法/q40_组合总和2)
* [q46_全排列](/src/回溯法/q46_全排列)
-[q10\_regular expression matching](/src/backtracking/q10_regular expression matching) -[q22\_bracket generation](/src/backtracking/q22_bracket generation) -[q40\_combined sum 2](/src/backtracking/q40_combined sum 2) -[q46\_all permutation](/src/backtracking/q46_all permutation)
### 树的遍历
### Tree traversal
* [q94_二叉树的中序遍历](/src/树的遍历/q94_二叉树的中序遍历)
* [q102_二叉树的层次遍历](/src/树的遍历/q102_二叉树的层次遍历)
* [q110_平衡二叉树](/src/树的遍历/q110_平衡二叉树)
* [q144_二叉树的前序遍历](/src/树的遍历/q144_二叉树的前序遍历)
* [q145_二叉树的后序遍历](/src/树的遍历/q145_二叉树的后序遍历)
-[q94\_In-order traversal of binary tree](/src/Tree traversal/q94_In-order traversal of binary tree) -[q102\_Binary tree traversal](/src/Tree traversal/q102_Binary tree traversal) -[q110\_balanced binary tree](/src/tree traversal/q110_balanced binary tree) -[q144\_Preorder traversal of binary tree](/src/Tree traversal/q144_Preorder traversal of binary tree) -[q145\_Post-order traversal of binary tree](/src/Traversal of tree/q145_Post-order traversal of binary tree)
### 二叉搜索树相关
### Binary search tree related
* [q98_验证二叉搜索树](/src/二叉搜索树相关/q98_验证二叉搜索树)
* [q450_删除二叉搜索树中的节点](/src/二叉搜索树相关/q450_删除二叉搜索树中的节点)
* [q701_二叉搜索树中的插入操作](/src/二叉搜索树相关/q701_二叉搜索树中的插入操作)
-[q98\_Verify Binary Search Tree](/src/Binary Search Tree Related/q98_Verify Binary Search Tree) -[q450\_delete nodes in binary search tree](/src/binary search tree related/q450_delete nodes in binary search tree) -[q701\_insert operation in binary search tree](/src/binary search tree related/q701_insert operation in binary search tree)
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## 面试问题整理
## Interview questions finishing
* [面试问题整理](/Rocket.md)
-[Interview Questions Finishing](/Rocket.md)

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