Leetcode 题解

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• • 博客地址：http://www.liuchuo.net/

  ID	Title	Difficulty	Java	Python	mycode	C++
  001	Two Sum	Easy	Java	Python		C++
  002	Add Two Numbers	Medium	Java	Python		C++
  003	Longest Substring Without Repeating Characters	Medium	Java	Python		C++
  004	Median of Two Sorted Arrays	Hard	no	no		no
  005	Longest Palindromic Substring	Medium	no	no		C++
  006	ZigZag Conversion	Easy	Java	Python		C++
  007	Reverse Integer	Easy	Java	Python		C++
  008	String to Integer (atoi)	Easy	Java	no		C++
  009	Palindrome Number	Easy	Java	Python		C++
  010	Regular Expression Matching	Hard	Java	no		no
  011	Container With Most Water	Medium	Java	no	no	C++
  012	Integer to Roman	Medium	Java	Python	no	C++
  013	Roman to Integer	Easy	Java	Python	no	C++
  014	Longest Common Prefix	Easy	Java	Python	no	C++
  015	3Sum	Medium	Java	Python	Ruby	C++
  016	3Sum Closest	Medium	Java	no	no	C++
  017	Letter Combinations of a Phone Number	Medium	Java	Python	no	C++
  018	4Sum	Medium	Java	no	no	C++
  019	Remove Nth Node From End of List	Easy	Java	Python	Ruby	C++
  020	Valid Parentheses	Easy	Java	no	no	C++
  021	Merge Two Sorted Lists	Easy	Java	Python	Ruby	C++
  022	Generate Parentheses	Medium	Java	Python	no	C++
  023	Merge k Sorted Lists	Hard	Java	Python	Ruby	no
  024	Swap Nodes in Pairs	Easy	Java	Python	no	C++
  025	Reverse Nodes in k-Group	Hard	Java	no	no	no
  026	Remove Duplicates from Sorted Array	Easy	Java	Python	no	C++
  027	Remove Element	Easy	Java	Python	no	C++
  028	Implement strStr()	Easy	Java	no	no	C++
  029	Divide Two Integers	Medium	Java	no	no	C++
  030	Substring with Concatenation of All Words	Hard	no	no	no	no
  031	Next Permutation	Medium	Java	Python	no	C++
  032	Longest Valid Parentheses	Hard	Java	no	no	no
  033	Search in Rotated Sorted Array	Hard	Java	no	no	no
  034	Search for a Range	Medium	Java	Python	no	C++
  035	Search Insert Position	Medium	Java	Python	no	C++
  036	Valid Sudoku	Easy	Java	no	no	C++
  037	Sudoku Solver	Hard	Java	no	no	no
  038	Count and Say	Easy	Java	no	no	C++
  039	Combination Sum	Medium	Java	Python	no	C++
  040	Combination Sum II	Medium	Java	no	no	C++
  041	First Missing Positive	Hard	Java	Python	no	no
  042	Trapping Rain Water	Hard	Java	no	no	C++
  043	Multiply Strings	Medium	Java	Python	no	no
  044	Wildcard Matching	Hard	no	no	no	no
  045	Jump Game II	Hard	Java	no	no	no
  046	Permutations	Medium	Java	Python	no	C++
  047	Permutations II	Medium	Java	Python	no	C++
  048	Rotate Image	Medium	Java	Python	no	C++
  049	Group Anagrams	Medium	Java	Python	no	no
  050	Pow(x, n)	Medium	Java	Python	no	no
  051	N-Queens	Hard	Java	Python	no	C++
  052	N-Queens II	Hard	Java	Python	no	C++
  053	Maximum Subarray	Medium	Java	Python	no	C++
  054	Spiral Matrix	Medium	Java	Python	no	no
  055	Jump Game	Medium	Java	Python	no	C++
  056	Merge Intervals	Hard	Java	no	no	no
  057	Insert Interval	Hard	Java	Python	no	no
  058	Length of Last Word	Easy	Java	Python	no	C++
  059	Spiral Matrix II	Medium	Java	Python	no	C++
  060	Permutation Sequence	Medium	Java	Python	no	C++
  061	Rotate List	Medium	Java	Python	no	C++
  062	Unique Paths	Medium	Java	Python	no	C++
  063	Unique Paths II	Medium	Java	Python	no	C++
  064	Minimum Path Sum	Medium	Java	Python	no	C++
  065	Valid Number	Hard	no	no	no	no
  066	Plus One	Easy	Java	no	no	C++
  067	Add Binary	Easy	Java	Python	no	C++
  068	Text Justification	Hard	Java	Python	no	no
  069	Sqrt(x)	Medium	Java	Python	no	C++
  070	Climbing Stairs	Easy	Java	Python	no	C++
  071	Simplify Path	Medium	no	no	no	C++
  072	Edit Distance	Hard	Java	Python	no	no
  073	Set Matrix Zeroes	Medium	Java	Python	no	no
  074	Search a 2D Matrix	Medium	Java	Python	no	no
  075	Sort Colors	Medium	Java	Python	no	C++
  076	Minimum Window Substring	Hard	no	no	no	no
  077	Combinations	Medium	Java	Python	no	C++
  078	Subsets	Medium	Java	Python	no	C++
  079	Word Search	Medium	Java	no	no	no
  080	Remove Duplicates from Sorted Array II	Medium	Java	Python	no	C++
  081	Search in Rotated Sorted Array II	Medium	Java	no	no	no
  082	Remove Duplicates from Sorted List II	Medium	Java	Python	no	C++
  083	Remove Duplicates from Sorted List	Easy	Java	Python	no	C++
  084	Largest Rectangle in Histogram	Hard	no	no	no	no
  085	Maximal Rectangle	Hard	no	no	no	no
  086	Partition List	Medium	Java	Python	no	no
  087	Scramble String	Hard	Java	Python	no	no
  088	Merge Sorted Array	Easy	Java	Python	no	C++
  089	Gray Code	Medium	Java	Python	no	no
  090	Subsets II	Medium	Java	Python	no	C++
  091	Decode Ways	Medium	Java	Python	no	C++
  092	Reverse Linked List II	Medium	Java	no	no	no
  093	Restore IP Addresses	Medium	Java	Python	no	C++
  094	Binary Tree Inorder Traversal	Medium	Java	Python	Ruby	C++
  095	Unique Binary Search Trees II	Medium	Java	no	no	no
  096	Unique Binary Search Trees	Medium	Java	Python	no	C++
  097	Interleaving String	Hard	Java	Python	no	no
  098	Validate Binary Search Tree	Medium	Java	Python	Ruby	C++
  099	Recover Binary Search Tree	Hard	no	Python	no	no
  100	Same Tree	Easy	Java	Python	Ruby	C++
  101	Symmetric Tree	Easy	Java	Python	Ruby	C++
  102	Binary Tree Level Order Traversal	Easy	Java	Python	no	C++
  103	Binary Tree Zigzag Level Order Traversal	Medium	Java	Python	no	C++
  104	Maximum Depth of Binary Tree	Easy	Java	Python	Ruby	C++
  105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Java	Python	Ruby	no
  106	Construct Binary Tree from Inorder and Postorder Traversal	Medium	Java	Python	Ruby	no
  107	Binary Tree Level Order Traversal II	Easy	Java	Python	no	C++
  108	Convert Sorted Array to Binary Search Tree	Medium	Java	Python	no	C++
  109	Convert Sorted List to Binary Search Tree	Medium	Java	Python	no	C++
  110	Balanced Binary Tree	Easy	Java	Python	Ruby	C++
  111	Minimum Depth of Binary Tree	Easy	Java	Python	Ruby	C++
  112	Path Sum	Easy	Java	Python	Ruby	C++
  113	Path Sum II	Medium	Java	Python	no	C++
  114	Flatten Binary Tree to Linked List	Medium	Java	Python	no	no
  115	Distinct Subsequences	Hard	no	no	no	no
  116	Populating Next Right Pointers in Each Node	Medium	Java	Python	no	no
  117	Populating Next Right Pointers in Each Node II	Hard	Java	Python	no	no
  118	Pascal's Triangle	Easy	Java	Python	no	C++
  119	Pascal's Triangle II	Easy	Java	Python	no	C++
  120	Triangle	Medium	Java	Python	no	C++
  121	Best Time to Buy and Sell Stock	Easy	Java	no	no	C++
  122	Best Time to Buy and Sell Stock II	Medium	Java	no	no	C++
  123	Best Time to Buy and Sell Stock III	Hard	Java	no	no	no
  124	Binary Tree Maximum Path Sum	Hard	Java	no	no	no
  125	Valid Palindrome	Easy	Java	no	no	C++
  126	Word Ladder II	Hard	no	no	no	no
  127	Word Ladder	Medium	Java	no	no	C++
  128	Longest Consecutive Sequence	Hard	Java	no	no	no
  129	Sum Root to Leaf Numbers	Medium	Java	Python	no	C++
  130	Surrounded Regions	Medium	Java	no	no	C++
  131	Palindrome Partitioning	Medium	Java	no	no	no
  132	Palindrome Partitioning II	Hard	no	no	no	no
  133	Clone Graph	Medium	Java	Python	no	no
  134	Gas Station	Medium	Java	Python	no	C++
  135	Candy	Hard	Java	no	no	no
  136	Single Number	Easy	Java	Python	no	C++
  137	Single Number II	Medium	Java	no	no	C++
  138	Copy List with Random Pointer	Hard	Java	Python	no	no
  139	Word Break	Medium	Java	no	no	no
  140	Word Break II	Hard	Java	no	no	no
  141	Linked List Cycle	Easy	Java	Python	no	C++
  142	Linked List Cycle II	Medium	Java	Python	no	C++
  143	Reorder List	Medium	Java	Python	no	C++
  144	Binary Tree Preorder Traversal	Medium	Java	Python	Ruby	C++
  145	Binary Tree Postorder Traversal	Hard	Java	Python	no	C++
  146	LRU Cache	Hard	Java	Python	no	no
  147	Insertion Sort List	Medium	Java	no	no	no
  148	Sort List	Medium	Java	Python	no	no
  149	Max Points on a Line	Hard	Java	no	no	no
  150	Evaluate Reverse Polish Notation	Medium	Java	no	no	no
  151	Reverse Words in a String	Medium	Java	no	no	C++
  152	Maximum Product Subarray	Medium	Java	no	no	C++
  153	Find Minimum in Rotated Sorted Array	Medium	Java	no	no	C++
  154	Find Minimum in Rotated Sorted Array II	Hard	Java	no	no	no
  155	Min Stack	Easy	Java	no	no	C++
  156	Binary Tree Upside Down	Medium	Java	no	no	no
  157	Read N Characters Given Read4	Easy	no	no	no	no
  158	Read N Characters Given Read4 II - Call multiple times	Hard	no	no	no	no
  159	Longest Substring with At Most Two Distinct Characters	Hard	no	no	no	no
  160	Intersection of Two Linked Lists	Easy	Java	Python	no	C++
  161	One Edit Distance	Medium	Java	no	no	no
  162	Find Peak Element	Medium	Java	no	no	C++
  163	Missing Ranges	Medium	no	no	no	no
  164	Maximum Gap	Hard	Java	no	no	no
  165	Compare Version Numbers	Easy	Java	Python	no	C++
  166	Fraction to Recurring Decimal	Medium	Java	no	no	C++
  167	Two Sum II - Input array is sorted	Medium	Java	no	no	C++
  168	Excel Sheet Column Title	Easy	Java	Python	no	C++
  169	Majority Element	Easy	Java	Python	no	C++
  170	Two Sum III - Data structure design	Easy	no	no	no	no
  171	Excel Sheet Column Number	Easy	Java	Python	no	C++
  172	Factorial Trailing Zeroes	Easy	Java	Python	no	C++
  173	Binary Search Tree Iterator	Medium	Java	no	no	no
  174	Dungeon Game	Hard	no	no	no	no
  179	Largest Number	Medium	Java	Python	no	C++
  186	Reverse Words in a String II	Medium	no	no	no	no
  187	Repeated DNA Sequences	Medium	Java	no	no	no
  188	Best Time to Buy and Sell Stock IV	Hard	no	no	no	no
  189	Rotate Array	Easy	Java	Python	no	C++
  190	Reverse Bits	Easy	Java	Python	no	C++
  191	Number of 1 Bits	Easy	Java	Python	no	C++
  198	House Robber	Easy	Java	Python	no	C++
  199	Binary Tree Right Side View	Medium	Java	Python	no	C++
  200	Number of Islands	Medium	Java	Python	no	no
  201	Bitwise AND of Numbers Range	Medium	Java	no	no	no
  202	Happy Number	Easy	Java	Python	no	C++
  203	Remove Linked List Elements	Easy	Java	Python	no	C++
  204	Count Primes	Easy	Java	no	no	C++
  205	Isomorphic Strings	Easy	Java	Python	no	C++
  206	Reverse Linked List	Easy	Java	Python	no	C++
  207	Course Schedule	Medium	no	no	no	no
  208	Implement Trie (Prefix Tree)	Medium	Java	no	no	no
  209	Minimum Size Subarray Sum	Medium	no	no	no	C++
  210	Course Schedule II	Medium	no	no	no	no
  211	Add and Search Word - Data structure design	Medium	no	no	no	no
  212	Word Search II	Hard	Java	no	no	no
  213	House Robber II	Medium	Java	Python	no	C++
  214	Shortest Palindrome	Hard	no	no	no	no
  215	Kth Largest Element in an Array	Medium	Java	Python	no	C++
  216	Combination Sum III	Medium	Java	Python	no	C++
  217	Contains Duplicate	Easy	Java	Python	no	C++
  218	The Skyline Problem	Hard	no	no	no	no
  219	Contains Duplicate II	Easy	Java	Python	no	C++
  220	Contains Duplicate III	Medium	no	no	no	C++
  221	Maximal Square	Medium	Java	no	no	no
  222	Count Complete Tree Nodes	Medium	Java	Python	no	C++
  223	Rectangle Area	Easy	Java	Python	no	C++
  224	Basic Calculator	Hard	no	no	no	no
  225	Implement Stack using Queues	Easy	Java	no	no	C++
  226	Invert Binary Tree	Easy	Java	Python	Ruby	C++
  227	Basic Calculator II	Medium	no	no	no	no
  228	Summary Ranges	Medium	Java	Python	no	C++
  229	Majority Element II	Medium	Java	no	no	no
  230	Kth Smallest Element in a BST	Medium	Java	Python	Ruby	C++
  231	Power of Two	Easy	Java	Python	no	C++
  232	Implement Queue using Stacks	Easy	Java	no	no	C++
  233	Number of Digit One	Hard	no	no	no	no
  234	Palindrome Linked List	Easy	Java	no	no	C++
  235	Lowest Common Ancestor of a Binary Search Tree	Easy	Java	Python	no	C++
  236	Lowest Common Ancestor of a Binary Tree	Medium	Java	Python	no	no
  237	Delete Node in a Linked List	Easy	Java	Python	no	C++
  238	Product of Array Except Self	Medium	Java	Python	no	C++
  239	Sliding Window Maximum	Hard	Java	Python	no	no
  240	Search a 2D Matrix II	Medium	Java	no	no	no
  241	Different Ways to Add Parentheses	Medium	no	no	no	no
  242	Valid Anagram	Easy	Java	Python	no	C++
  243	Shortest Word Distance	Easy	no	no	no	no
  244	Shortest Word Distance II	Medium	no	no	no	no
  245	Shortest Word Distance III	Medium	no	no	no	no
  246	Strobogrammatic Number	Easy	no	no	no	no
  247	Strobogrammatic Number II	Medium	no	no	no	no
  248	Strobogrammatic Number III	Hard	no	no	no	no
  249	Group Shifted Strings	Easy	no	no	no	no
  250	Count Univalue Subtrees	Medium	no	no	no	no
  251	Flatten 2D Vector	Medium	no	no	no	no
  252	Meeting Rooms	Easy	no	no	no	no
  253	Meeting Rooms II	Medium	no	no	no	no
  254	Factor Combinations	Medium	no	no	no	no
  255	Verify Preorder Sequence in Binary Search Tree	Medium	no	no	no	no
  256	Paint House	Medium	no	no	no	no
  257	Binary Tree Paths	Easy	Java	Python	no	no
  258	Add Digits	Easy	Java	Python	no	C++
  259	3Sum Smaller	Medium	no	no	no	no
  260	Single Number III	Medium	Java	Python	no	C++
  261	Graph Valid Tree	Medium	no	no	no	no
  263	Ugly Number	Easy	Java	Python	no	C++
  264	Ugly Number II	Medium	Java	no	no	no
  265	Paint House II	Hard	no	no	no	no
  266	Palindrome Permutation	Easy	no	no	no	no
  267	Palindrome Permutation II	Medium	no	no	no	no
  268	Missing Number	Medium	Java	Python	no	C++
  269	Alien Dictionary	Hard	no	no	no	no
  270	Closest Binary Search Tree Value	Easy	no	no	no	no
  271	Encode and Decode Strings	Medium	no	no	no	no
  272	Closest Binary Search Tree Value II	Hard	no	no	no	no
  273	Integer to English Words	Hard	Java	Python	no	no
  274	H-Index	Medium	Java	no	no	no
  275	H-Index II	Medium	Java	no	no	no
  276	Paint Fence	Easy	no	no	no	no
  277	Find the Celebrity	Medium	no	no	no	no
  278	First Bad Version	Easy	Java	Python	no	C++
  279	Perfect Squares	Medium	Java	no	no	C++
  280	Wiggle Sort	Medium	no	no	no	no
  281	Zigzag Iterator	Medium	no	no	no	no
  282	Expression Add Operators	Hard	no	no	no	no
  283	Move Zeroes	Easy	Java	Python	no	C++
  284	Peeking Iterator	Medium	Java	no	no	no
  285	Inorder Successor in BST	Medium	no	no	no	no
  286	Walls and Gates	Medium	no	no	no	no
  287	Find the Duplicate Number	Hard	Java	Python	no	no
  288	Unique Word Abbreviation	Easy	no	no	no	no
  289	Game of Life	Medium	Java	Python	no	no
  290	Word Pattern	Easy	Java	Python	no	C++
  291	Word Pattern II	Hard	no	no	no	no
  292	Nim Game	Easy	Java	Python	no	C++
  293	Flip Game	Easy	no	no	no	no
  294	Flip Game II	Medium	no	no	no	no
  295	Find Median from Data Stream	Hard	Java	no	no	no
  296	Best Meeting Point	Hard	no	no	no	no
  297	Serialize and Deserialize Binary Tree	Hard	Java	no	no	no
  298	Binary Tree Longest Consecutive Sequence	Medium	no	no	no	no
  299	Bulls and Cows	Easy	Java	Python	no	C++
  300	Longest Increasing Subsequence	Medium	Java	no	no	C++
  301	Remove Invalid Parentheses	Hard	no	no	no	no
  302	Smallest Rectangle Enclosing Black Pixels	Hard	no	no	no	no
  303	Range Sum Query - Immutable	Easy	Java	Python	no	C++
  304	Range Sum Query 2D - Immutable	Medium	no	Python	no	C++
  305	Number of Islands II	Hard	no	no	no	no
  306	Additive Number	Medium	Java	Python	no	no
  307	Range Sum Query - Mutable	Medium	Java	no	no	C++
  308	Range Sum Query 2D - Mutable	Hard	no	no	no	no
  309	Best Time to Buy and Sell Stock with Cooldown	Medium	Java	no	no	no
  310	Minimum Height Trees	Medium	no	no	no	no
  311	Sparse Matrix Multiplication	Medium	no	no	no	no
  312	Burst Balloons	Hard	no	no	no	no
  313	Super Ugly Number	Medium	no	no	no	no
  314	Binary Tree Vertical Order Traversal	Medium	no	no	no	no
  315	Count of Smaller Numbers After Self	Hard	Java	Python	no	no
  316	Remove Duplicate Letters	Hard	Java	no	no	no
  317	Shortest Distance from All Buildings	Hard	no	no	no	no
  318	Maximum Product of Word Lengths	Medium	Java	Python	no	C++
  319	Bulb Switcher	Medium	Java	Python	no	C++
  320	Generalized Abbreviation	Medium	no	no	no	no
  321	Create Maximum Number	Hard	no	no	no	no
  322	Coin Change	Medium	Java	no	no	no
  323	Number of Connected Components in an Undirected Graph	Medium	no	no	no	no
  324	Wiggle Sort II	Medium	no	Python	no	C++
  325	Maximum Size Subarray Sum Equals k	Medium	no	no	no	no
  326	Power of Three	Easy	Java	Python	no	C++
  327	Count of Range Sum	Hard	no	no	no	no
  328	Odd Even Linked List	Medium	Java	Python	no	C++
  329	Longest Increasing Path in a Matrix	Hard	Java	Python	no	no
  330	Patching Array	Hard	no	no	no	C++
  331	Verify Preorder Serialization of a Binary Tree	Medium	Java	Python	no	no
  332	Reconstruct Itinerary	Medium	no	no	no	no
  333	Largest BST Subtree	Medium	no	no	no	no
  334	Increasing Triplet Subsequence	Medium	Java	Python	no	no
  335	Self Crossing	Hard	no	no	no	no
  336	Palindrome Pairs	Hard	no	no	no	no
  337	House Robber III	Medium	Java	Python	no	no
  338	Counting Bits	Medium	Java	Python	no	C++
  339	Nested List Weight Sum	Easy	no	no	no	no
  340	Longest Substring with At Most K Distinct Characters	Hard	no	no	no	no
  341	Flatten Nested List Iterator	Medium	Java	Python	no	no
  342	Power of Four	Easy	Java	Python	no	no
  343	Integer Break	Medium	Java	Python	no	C++
  344	Reverse String	Easy	Java	Python	no	C++
  345	Reverse Vowels of a String	Easy	Java	Python	no	C++
  346	Moving Average from Data Stream	Easy	no	no	no	no
  347	Top K Frequent Elements	Medium	Java	Python	no	C++
  348	Design Tic-Tac-Toe	Medium	no	no	no	no
  349	Intersection of Two Arrays	Easy	Java	no	no	C++
  350	Intersection of Two Arrays II	Easy	Java	no	no	C++
  351	Android Unlock Patterns	Medium	no	no	no	no
  352	Data Stream as Disjoint Intervals	Hard	Java	no	no	no
  353	Design Snake Game	Medium	no	no	no	no
  354	Russian Doll Envelopes	Hard	Java	no	no	no
  355	Design Twitter	Medium	Java	no	no	no
  356	Line Reflection	Medium	no	no	no	no
  357	Count Numbers with Unique Digits	Medium	Java	no	no	C++
  358	Rearrange String k Distance Apart	Hard	no	no	no	no
  359	Logger Rate Limiter	Easy	no	no	no	no
  360	Sort Transformed Array	Medium	no	no	no	no
  361	Bomb Enemy	Medium	no	no	no	no
  362	Design Hit Counter	Medium	no	no	no	no
  363	Max Sum of Rectangle No Larger Than K	Hard	Java	no	no	no
  364	Nested List Weight Sum II	Medium	no	no	no	no
  365	Water and Jug Problem	Medium	Java	no	no	C++
  366	Find Leaves of Binary Tree	Medium	no	no	no	no
  367	Valid Perfect Square	Medium	Java	no	no	C++
  368	Largest Divisible Subset	Medium	Java	no	no	no
  369	Plus One Linked List	Medium	no	no	no	no
  370	Range Addition	Medium	no	no	no	no
  371	Sum of Two Integers	Easy	Java	no	no	C++
  372	Super Pow	Medium	Java	no	no	no
  373	Find K Pairs with Smallest Sums	Medium	Java	no	no	no
  374	Guess Number Higher or Lower	Easy	Java	no	no	C++
  375	Guess Number Higher or Lower II	Medium	Java	no	no	no
  376	Wiggle Subsequence	Medium	Java	no	no	no
  377	Combination Sum IV	Medium	Java	no	no	no
  378	Kth Smallest Element in a Sorted Matrix	Medium	Java	no	no	C++
  379	Design Phone Directory	Medium	no	no	no	no
  380	Insert Delete GetRandom O(1)	Hard	Java	no	no	no
  381	Insert Delete GetRandom O(1) - Duplicates allowed	Hard	Java	no	no	no
  382	Linked List Random Node	Medium	Java	no	no	C++
  383	Ransom Note	Easy	Java	no	no	C++
  384	Shuffle an Array	Medium	Java	no	no	C++
  385	Mini Parser	Medium	Java	no	no	no
  386	Lexicographical Numbers	Medium	Java	no	no	no
  387	First Unique Character in a String	Easy	Java	no	no	C++
  388	Longest Absolute File Path	Medium	Java	no	no	no
  389	Find the Difference	Easy	Java	no	no	C++
  390	Elimination Game	Medium	Java	no	no	no
  391	Perfect Rectangle	Hard	Java	no	no	no
  392	Is Subsequence	Medium	Java	no	no	C++
  393	UTF-8 Validation	Medium	Java	no	no	no
  394	Decode String	Medium	Java	no	no	no
  395	Longest Substring with At Least K Repeating Characters	Medium	Java	no	no	no
  396	Rotate Function	Easy	Java	no	no	C++
  397	Integer Replacement	Medium	Java	no	no	no
  398	Random Pick Index	Medium	Java	no	no	C++
  399	Evaluate Division	Medium	no	no	no	no
  400	Nth Digit	Easy	Java	no	no	C++
  401	Binary Watch	Easy	Java	no	no	C++
  402	Remove K Digits	Medium	Java	no	no	C++
  403	Frog Jump	Hard	Java	no	no	no
  404	Sum of Left Leaves	Easy	Java	no	no	C++
  405	Convert a Number to Hexadecimal	Easy	Java	no	no	C++
  406	Queue Reconstruction by Height	Medium	Java	no	no	C++
  407	Trapping Rain Water II	Hard	no	no	no	no
  408	Valid Word Abbreviation	Easy	no	no	no	no
  409	Longest Palindrome	Easy	Java	no	no	C++
  410	Split Array Largest Sum	Hard	no	no	no	no
  411	Minimum Unique Word Abbreviation	Hard	no	no	no	no
  412	Fizz Buzz	Easy	no	no	no	C++
  413	Arithmetic Slices	Medium	no	no	no	C++
  415	Add Strings	Easy	Java	no	no	C++
  416	Partition Equal Subset Sum	Medium	Java	no	no	no
  417	Pacific Atlantic Water Flow	Medium	Java	no	no	no
  418	Sentence Screen Fitting	Medium	no	no	no	no
  419	Battleships in a Board	Medium	no	no	no	C++
  423	Reconstruct Original Digits from English	Medium	no	no	no	C++
  434	Number of Segments in a String	Easy	no	no	no	C++
  437	Path Sum III	Easy	no	no	no	C++
  438	Find All Anagrams in a String	Easy	no	no	no	C++
  441	Arranging Coins	Easy	no	no	no	C++
  442	Find All Duplicates in an Array	Medium	no	no	no	C++
  445	Add Two Numbers II	Medium	no	no	no	C++
  447	Number of Boomerangs	Easy	no	no	no	C++
  448	Find All Numbers Disappeared in an Array	Easy	no	no	no	C++
  451	Sort Characters By Frequency	Medium	no	no	no	C++
  453	Minimum Moves to Equal Array Elements	Easy	no	no	no	C++
  454	4Sum II	Medium	no	no	no	C++
  455	Assign Cookies	Easy	no	no	no	C++
  459	Repeated Substring Pattern	Easy	no	no	no	C++
  461	Hamming Distance	Easy	no	no	no	C++
  462	Minimum Moves to Equal Array Elements II	Medium	no	no	no	C++
  463	Island Perimeter	Easy	no	no	no	C++
  464	Can I Win	Medium	no	no	no	C++
  468	Validate IP Address	Medium	no	no	no	C++
  475	Heaters	Easy	no	no	no	C++
  476	Number Complement	Easy	no	no	no	C++
  477	Total Hamming Distance	Medium	no	no	no	C++
  481	Magical String	Medium	no	no	no	C++
  482	License Key Formatting	Medium	no	no	no	C++
  485	Max Consecutive Ones	Easy	no	no	no	C++
  486	Predict the Winner	Medium	no	no	no	C++
  491	Increasing Subsequences	Medium	no	no	no	C++
  492	Construct the Rectangle	Medium	no	no	no	C++
  494	Target Sum	Medium	no	no	no	C++
  495	Teemo Attacking	Medium	no	no	no	C++
  496	Next Greater Element I	Easy	no	no	no	C++
  498	Diagonal Traverse	Medium	no	no	no	C++
  500	Keyboard Row	Easy	no	no	no	C++
  501	Find Mode in Binary Search Tree	Medium	no	no	no	C++
  503	Next Greater Element II	Medium	no	no	no	C++
  504	Base 7	Easy	no	no	no	C++
  506	Relative Ranks	Easy	no	no	no	C++
  508	Most Frequent Subtree Sum	Medium	no	no	no	C++
  513	Find Bottom Left Tree Value	Medium	no	no	no	C++
  515	Find Largest Value in Each Tree Row	Medium	no	no	no	C++
  516	Longest Palindromic Subsequence	Medium	no	no	no	C++