README.md

Algorithms

ID	Blog	Solutions	Diffculty	Tags
1137	N-th Tribonacci Number	2 .cpp
701	Insert into a Binary Search Tree	2 .cpp
445	Add Two Numbers II	1 .cpp	MEDIUM	STACK LINKED LIST
997	Find the Town Judge	1 .java
442	Find All Duplicates in an Array	1 .py	MEDIUM
896	Monotonic Array	2 .cpp
1180	Count Substrings with Only One Distinct Letter	4 .cpp
1221	Split a String in Balanced Strings	1 .cpp
1260	Shift 2D Grid	1 .cpp	EASY	GRID SIMULATION
1261	Find Elements in a Contaminated Binary Tree	1 .cpp	MEDIUM	DFS
297	Serialize and Deserialize Binary Tree	1 .cpp
5453	Running Sum of 1d Array	1 .cpp	EASY	PREFIX SUM
994	Rotting Oranges	1 .cpp	EASY	BFS
1502	Can Make Arithmetic Progression From Sequence	1 .cpp	EASY	SORTING
1400	Construct K Palindrome Strings	1 .cpp	MEDIUM	BITSET PALINDROME
280	Wiggle Sort	2 .cpp
246	Strobogrammatic Number	2 .cpp
1020	Partition Array Into Three Parts With Equal Sum	1 .cpp
34	Find First and Last Position of Element in Sorted Array	3 .js .cpp
1087	Brace Expansion	2 .cpp
1614	Maximum Nesting Depth of the Parentheses	1 .cpp	EASY	STRING
362	Design Hit Counter	2 .cpp
1110	Delete Nodes And Return Forest	1 .cpp
949	Largest Time for Given Digits	1 .cpp	EASY	PERMUTATION
515	Find Largest Value in Each Tree Row	2 .cpp
171	Excel Sheet Column Number	1 .py	EASY
929	Unique Email Addresses	3 .js .cpp
1208	Get Equal Substrings Within Budget	1 .cpp
1404	Number of Steps to Reduce a Number in Binary Representation to One	1 .cpp	EASY	BINARY
300	Longest Increasing Subsequence	1 .cpp
1570	Dot Product of Two Sparse Vectors	1 .cpp
999	Available Captures for Rook	1 .cpp
1220	Count Vowels Permutation	1 .cpp	HARD	DP
201	Bitwise AND of Numbers Range	1 .cpp	MEDIUM	BIT
908	Smallest Range I	1 .cpp
52	N-Queens II	1 .cpp	HARD	RECURSION BACKTRACKING DFS
507	Perfect Number	2 .cpp
346	Moving Average from Data Stream	1 .cpp	EASY	DEQUE
1244	Design A Leaderboard	1 .cpp	MEDIUM	HASH MAP MULTI SET
1360	Number of Days Between Two Dates	1 .cpp	EASY	DATE
724	Find Pivot Index	2 .cpp
408	Valid Word Abbreviation	1 .cpp
1491	Average Salary Excluding the Minimum and Maximum Salary	1 .cpp	EASY
985	Sum of Even Numbers After Queries	2 .java .js
367	Valid Perfect Square	4 .cpp
970	Powerful Integers	1 .cpp
350	Intersection of Two Arrays II	4 .js .cpp .java
931	Minimum Falling Path Sum	1 .cpp
1160	Find Words That Can Be Formed by Characters	1 .cpp
1188	Design Bounded Blocking Queue	1 .py	MEDIUM	THREADING
593	Valid Square	2 .java .cpp
1037	Valid Boomerang	3 .cpp
1190	Reverse Substrings Between Each Pair of Parentheses	1 .cpp
1008	Construct Binary Search Tree from Preorder Traversal	3 .java .cpp
1218	Longest Arithmetic Subsequence of Given Difference	1 .cpp
703	Kth Largest Element in a Stream	1 .cpp
860	Lemonade Change	1 .cpp
693	Binary Number with Alternating Bits	2 .cpp
819	Most Common Word	2 .cpp
859	Buddy Strings	1 .cpp
700	Search in a Binary Search Tree	6 .js .cpp .java
645	Set Mismatch	3 .cpp
1365	How Many Numbers Are Smaller Than the Current Number	1 .cpp	EASY	BINARY SEARCH
1071	Greatest Common Divisor of Strings	1 .cpp
160	Intersection of Two Linked Lists	1 .cpp
951	Flip Equivalent Binary Trees	2 .cpp
18	4Sum	1 .cpp
647	Palindromic Substrings	2 .cpp
21	Merge Two Sorted Lists	4 .cpp
206	Reverse Linked List	1 .js	EASY	RECURSION LINKED LIST
704	Binary Search	1 .java
1513	Number of Substrings With Only 1s	1 .py	MEDIUM	MATH
993	Cousins in Binary Tree	2 .cpp
844	Backspace String Compare	3 .js .cpp .java
82	Remove Duplicates from Sorted List II	1 .cpp	MEDIUM	LINKED LIST
113	Path Sum II	2 .js	MEDIUM	RECURSION BFS BINARY TREE DFS QUEUE
77	Combinations	1 .py	MEDIUM	BITMASK
28	Implement strStr()	1 .cpp
108	Convert Sorted Array to Binary Search Tree	2 .cpp	EASY	RECURSION BINARY TREE
1605	Find Valid Matrix Given Row and Column Sums	1 .cpp	MEDIUM	GREEDY
31	Next Permutation	1 .cpp
1314	Matrix Block Sum	1 .cpp	MEDIUM	DP
1290	Convert Binary Number in a Linked List to Integer	1 .cpp	EASY	BINARY NUMBER LINKED LIST
1085	Sum of Digits in the Minimum Number	4 .py .cpp
804	Unique Morse Code Words	2 .java .cpp
6	ZigZag Conversion	1 .cpp	MEDIUM	SIMULATION STRING
359	Logger Rate Limiter	2 .java .cpp
536	Construct Binary Tree from String	1 .cpp
1171	Remove Zero Sum Consecutive Nodes from Linked List	1 .cpp	MEDIUM	LINKED LIST PREFIX SUM
1154	Day of the Year	1 .cpp	EASY	DATE MATH
106	Construct Binary Tree from Inorder and Postorder Traversal	2 .cpp
110	Balanced Binary Tree	1 .cpp	EASY	RECURSION BINARY TREE
967	Numbers With Same Consecutive Differences	1 .py	MEDIUM	DFS
393	UTF-8 Validation	1 .cpp
1288	Remove Covered Intervals	1 .cpp	MEDIUM	LINE SWEEP SORTING
1196	How Many Apples Can You Put into the Basket	1 .cpp
681	Next Closest Time	1 .cpp
1295	Find Numbers with Even Number of Digits	1 .cpp	EASY	ARRAY
594	Longest Harmonious Subsequence	1 .cpp	EASY	HASH MAP
103	Binary Tree Zigzag Level Order Traversal	2 .cpp
758	Bold Words in String	1 .cpp
1566	Detect Pattern of Length M Repeated K or More Times	1 .py	EASY	BRUTEFORCE
1396	Design Underground System	1 .cpp	MEDIUM	HASH MAP
1436	Destination City	1 .cpp	EASY	TREE
434	Number of Segments in a String	2 .py .cpp
151	Reverse Words in a String	1 .cpp	MEDIUM	STRING
876	Middle of the Linked List	2 .cpp
252	Meeting Rooms	2 .cpp
889	Construct Binary Tree from Preorder and Postorder Traversal	1 .cpp	MEDIUM	RECURSION
532	K-diff Pairs in an Array	3 .cpp
1624	Largest Substring Between Two Equal Characters	1 .cpp	EASY	HASH TABLE
1228	Missing Number In Arithmetic Progression	1 .cpp
1248	Count Number of Nice Subarrays	1 .java	MEDIUM	PREFIX SUM
841	Keys and Rooms	1 .cpp
1143	Longest Common Subsequence	1 .cpp	MEDIUM	DP
1213	Intersection of Three Sorted Arrays	2 .py .cpp
43	Multiply Strings	1 .java	MEDIUM	ARRAY
9	Palindrome Number	1 .cpp	EASY
148	Sort List	1 .cpp	MEDIUM	RECURSION SORT DIVIDE-AND-CONQUER
1282	Group the People Given the Group Size They Belong To	1 .cpp	MEDIUM	HASH MAP GREEDY ALGORITHM
254	Factor Combinations	2 .cpp
686	Repeated String Match	2 .js
1128	Number of Equivalent Domino Pairs	1 .cpp
1281	Subtract the Product and Sum of Digits of an Integer	1 .cpp	EASY	MATH
1317	Convert Integer to the Sum of Two No-Zero Integers	1 .java	EASY	BRUTEFORCE
661	Image Smoother	2 .java .cpp
328	Odd Even Linked List	1 .cpp	MEDIUM	LINKED LIST
653	Two Sum IV Input is a BST	6 .java .cpp
1490	Clone N-ary Tree	1 .cpp	MEDIUM	RECURSION HASH MAP DFS
1602	Find Nearest Right Node in Binary Tree	1 .cpp	MEDIUM	BFS
938	Range Sum of BST	2 .cpp
1018	Binary Prefix Divisible By 5	2 .java .cpp
856	Score of Parentheses	4 .cpp
976	Largest Perimeter Triangle	2 .java .cpp	EASY	GREEDY ARRAY SORTING TRIANGLE
942	DI String Match	2 .java .cpp
1472	Design Browser History	1 .cpp	MEDIUM	DEQUE
965	Univalued Binary Tree	2 .cpp
1026	Maximum Difference Between Node and Ancestor	1 .cpp
401	Binary Watch	1 .cpp
290	Word Pattern	1 .cpp	EASY	HASH MAP
394	Decode String	1 .cpp
261	Graph Valid Tree	2 .cpp
643	Maximum Average Subarray I	4 .js .cpp .java
339	Nested List Weight Sum	1 .cpp
1122	Relative Sort Array	3 .cpp
1528	Shuffle String	1 .py	EASY	STRING
334	Increasing Triplet Subsequence	1 .cpp
572	Subtree of Another Tree	2 .cpp
1175	Prime Arrangements	1 .cpp
1232	Check If It Is a Straight Line	1 .cpp	EASY	GEOMETRY
342	Power of Four	2 .cpp
348	Design Tic-Tac-Toe	1 .cpp
186	Reverse Words in a String II	2 .cpp
443	String Compression	1 .cpp
51	N-Queens	1 .cpp	HARD	RECURSION BACKTRACKING DFS
628	Maximum Product of Three Numbers	2 .cpp
520	Detect Capital	1 .js	EASY	REGEXP STRING
22	Generate Parentheses	2 .cpp
1492	The kth Factor of n	1 .cpp	MEDIUM
905	Sort Array By Parity	4 .cpp
1387	Sort Integers by The Power Value	1 .cpp	MEDIUM	RECURSION DYNAMIC PROGRAMMING
1518	Water Bottles	1 .java	EASY	SIMULATION
1612	Check If Two Expression Trees are Equivalent	1 .cpp	MEDIUM	DFS
1399	Count Largest Group	1 .cpp	EASY
1161	Maximum Level Sum of a Binary Tree	1 .cpp
946	Validate Stack Sequences	1 .cpp	MEDIUM	GREEDY STACK
582	Kill Process	2 .cpp
944	Delete Columns to Make Sorted	1 .cpp
1134	Armstrong Number	1 .py
762	Prime Number of Set Bits in Binary Representation	2 .py .cpp
1272	Remove Interval	1 .cpp	MEDIUM	INTERVAL
958	Check Completeness of a Binary Tree	2 .java .cpp
812	Largest Triangle Area	1 .cpp
392	Is Subsequence	1 .cpp
1344	Angle Between Hands of a Clock	1 .cpp	MEDIUM	GEOMETRY
251	Flatten 2D Vector	2 .cpp
690	Employee Importance	4 .java .cpp
1002	Find Common Characters	2 .java .cpp	EASY	ARRAY STRING
1222	Queens That Can Attack the King	1 .cpp	MEDIUM	ARRAY HASHSET
766	Toeplitz Matrix	2 .cpp
560	Subarray Sum Equals K	4 .cpp
744	Find Smallest Letter Greater Than Target	4 .js .cpp
217	Contains Duplicate	1 .js	EASY	HASH SET
987	Vertical Order Traversal of a Binary Tree	1 .cpp
867	Transpose Matrix	1 .cpp
1356	Sort Integers by The Number of 1 Bits	1 .cpp	EASY	BIT HACKS SORTING
1230	Toss Strange Coins	1 .cpp
476	Number Complement	5 .java .cpp .js
921	Minimum Add to Make Parentheses Valid	1 .cpp
1120	Maximum Average Subtree	1 .cpp
1380	Lucky Numbers in a Matrix	1 .cpp	EASY	MATRIX
1598	Crawler Log Folder	1 .cpp	EASY	SIMULATION
1027	Longest Arithmetic Sequence	1 .cpp	MEDIUM	DP
791	Custom Sort String	2 .cpp
537	Complex Number Multiplication	2 .js .cpp
1275	Find Winner on a Tic Tac Toe Game	1 .cpp	EASY	GAME BRUTEFORCE
33	Search in Rotated Sorted Array	2 .java .cpp
557	Reverse Words in a String III	3 .java .cpp
74	Search a 2D Matrix	3 .cpp
1005	Maximize Sum Of Array After K Negations	2 .cpp	EASY	ARRAY PRIORITY QUEUE
541	Reverse String II	1 .cpp
991	Broken Calculator	1 .cpp
59	Spiral Matrix II	1 .java	MEDIUM	SIMULATION
1273	Delete Tree Nodes	1 .cpp
671	Second Minimum Node In a Binary Tree	5 .java
1118	Number of Days in a Month	1 .cpp
884	Uncommon Words from Two Sentences	2 .java
1099	Two Sum Less Than K	2 .cpp
1315	Sum of Nodes with Even-Valued Grandparent	1 .java	MEDIUM	RECURSION DFS
1060	Missing Element in Sorted Array	2 .cpp
311	Sparse Matrix Multiplication	1 .cpp
250	Count Univalue Subtrees	5 .java .cpp
873	Length of Longest Fibonacci Subsequence	2 .cpp	MEDIUM	FIBONACCI DP BRUTEFORCE LONGEST INCREASE SEQUENCE
228	Summary Ranges	1 .cpp	MEDIUM	TWO POINTERS
941	Valid Mountain Array	2 .java .cpp
937	Reorder Data in Log Files	1 .cpp	EASY	SORTING
24	Swap Nodes in Pairs	1 .cpp	MEDIUM	RECURSION
1342	Number of Steps to Reduce a Number to Zero	1 .cpp	EASY
917	Reverse Only Letters	3 .java .cpp
353	Design Snake Game	1 .cpp
953	Verifying an Alien Dictionary	1 .cpp
125	Valid Palindrome	1 .cpp
1135	Connecting Cities With Minimum Cost	2 .cpp
482	License Key Formatting	2 .cpp
892	Surface Area of 3D Shapes	2 .cpp	EASY	COUNTING GEOMETRY
15	3Sum	2 .cpp
747	Largest Number At Least Twice of Others	1 .cpp
492	Construct the Rectangle	3 .java
1080	Insufficient Nodes in Root to Leaf Paths	1 .java
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	1 .cpp	EASY	STRING
1302	Deepest Leaves Sum	2 .cpp	MEDIUM	DFS BFS
1100	Find K-Length Substrings With No Repeated Characters	2 .cpp
347	Top K Frequent Elements	2 .cpp
1558	Minimum Numbers of Function Calls to Make Target Array	1 .cpp	MEDIUM	MATH
166	Fraction to Recurring Decimal	1 .java	MEDIUM	MATH HASH MAP
325	Maximum Size Subarray Sum Equals k	5 .cpp
518	Coin Change 2	1 .cpp
842	Split Array into Fibonacci Sequence	1 .cpp
1506	Find Root of N-Ary Tree	1 .cpp	MEDIUM	HASH SET
111	Minimum Depth of Binary Tree	1 .cpp	EASY	RECURSION DFS
961	N-Repeated Element in Size 2N Array	12 .java .cpp .js .py .php
633	Sum of Square Numbers	2 .cpp
525	Contiguous Array	1 .cpp	MEDIUM	ARRAY HASH MAP PREFIX SUM
205	Isomorphic Strings	1 .cpp
637	Average of Levels in Binary Tree	3 .cpp
1207	Unique Number of Occurrences	1 .cpp
366	Find Leaves of Binary Tree	2 .java .cpp
1522	Diameter of N-Ary Tree	1 .cpp	MEDIUM	DFS
5087	Letter Tile Possibilities	1 .cpp
609	Find Duplicate File in System	1 .js	MEDIUM	HASH MAP
501	Find Mode in Binary Search Tree	3 .cpp
504	Base 7	3 .cpp
973	K Closest Points to Origin	2 .java .cpp
266	Palindrome Permutation	2 .cpp
170	Two Sum III - Data structure design	3 .cpp
733	Flood Fill	2 .cpp
654	Maximum Binary Tree	2 .cpp
680	Valid Palindrome II	1 .cpp
806	Number of Lines to Write String	3 .java .cpp
1362	Closest Divisors	1 .cpp	MEDIUM	MATH
1022	Sum of Root To Leaf Binary Numbers	2 .java .cpp
1215	Stepping Numbers	1 .cpp
1200	Minimum Absolute Difference	1 .cpp
508	Most Frequent Subtree Sum	1 .cpp
821	Shortest Distance to a Character	2 .cpp
49	Group Anagrams	1 .cpp	MEDIUM	SORTING
437	Path Sum III	1 .cpp
669	Trim a Binary Search Tree	1 .cpp
409	Longest Palindrome	1 .cpp
1382	Balance a Binary Search Tree	1 .cpp	MEDIUM	RECURSION BINARY TREE
1046	Last Stone Weight	1 .java	EASY	PRIORITY QUEUE
1017	Convert to Base -2	2 .cpp
1291	Sequential Digits	2 .cpp	MEDIUM	DFS BFS
1328	Break a Palindrome	1 .js	MEDIUM
91	Decode Ways	1 .cpp
1021	Remove Outermost Parentheses	1 .cpp
836	Rectangle Overlap	1 .cpp	EASY	GEOMETRY
1237	Find Positive Integer Solution for a Given Equation	2 .cpp	EASY	BINARY SEARCH TWO POINTER
746	Min Cost Climbing Stairs	2 .cpp
1167	Minimum Cost to Connect Sticks	2 .py .cpp
1539	Kth Missing Positive Number	1 .cpp	EASY	HASH SET
37	Sudoku Solver	1 .cpp	HARD	BACKTRACKING DFS
1253	Reconstruct a 2-Row Binary Matrix	1 .cpp	MEDIUM	GREEDY
969	Pancake Sorting	1 .cpp	MEDIUM	ARRAY
1458	Max Dot Product of Two Subsequences	1 .cpp	HARD	DP
543	Diameter of Binary Tree	1 .cpp	EASY	RECURSION DFS
760	Find Anagram Mappings	3 .java .cpp
1325	Delete Leaves With a Given Value	1 .java	MEDIUM	RECURSION DFS BINARY TREE
814	Binary Tree Pruning	2 .cpp
1094	Car Pooling	2 .cpp	MEDIUM	GREEDY HASH MAP
1352	Product of the Last K Numbers	1 .cpp
230	Kth Smallest Element in a BST	8 .java .cpp
1265	Print Immutable Linked List in Reverse	2 .cpp	MEDIUM	RECURSION LINKED LIST STACK
1422	Maximum Score After Splitting a String	1 .cpp	EASY	PREFIX SUM
845	Longest Mountain in Array	1 .cpp	MEDIUM	ARRAY
915	Partition Array into Disjoint Intervals	1 .cpp
1249	Minimum Remove to Make Valid Parentheses	1 .cpp	MEDIUM	GREEDY PARENTHESES
415	Add Strings	1 .cpp
606	Construct String from Binary Tree	1 .cpp
55	Jump Game	1 .cpp	MEDIUM	GREEDY
451	Sort Characters By Frequency	2 .cpp
986	Interval List Intersections	1 .cpp	MEDIUM	TWO POINTER
830	Positions of Large Groups	2 .java .cpp
247	Strobogrammatic Number II	1 .cpp	MEDIUM	RECURSION
897	Increasing Order Search Tree	3 .cpp
874	Walking Robot Simulation	1 .cpp	EASY	HASH SET SIMULATION
538	Convert BST to Greater Tree	2 .cpp
105	Construct Binary Tree from Preorder and Inorder Traversal	1 .cpp
1415	The k-th Lexicographical String of All Happy Strings of Length n	1 .cpp	MEDIUM	RECURSION DFS
1485	Clone Binary Tree With Random Pointer	1 .cpp	MEDIUM	RECURSION HASH MAP
50	Pow(x, n)	1 .cpp	MEDIUM	RECURSION
1165	Single-Row Keyboard	2 .cpp	EASY	HASH MAP STRING
1185	Day of the Week	1 .cpp
883	Projection Area of 3D Shapes	1 .cpp
47	Permutations II	1 .cpp	MEDIUM	HASH SET PERMUTATION DFS
1003	Check If Word Is Valid After Substitutions	1 .cpp	MEDIUM	STACK
988	Smallest String Starting From Leaf	1 .cpp	MEDIUM	DFS
1299	Replace Elements with Greatest Element on Right Side	1 .cpp	EASY	ARRAY
1474	Delete N Nodes After M Nodes of a Linked List	1 .cpp	EASY	LINKED LIST
1437	Check If All 1's Are at Least Length K Places Away	1 .cpp	MEDIUM	ARRAY
477	Total Hamming Distance	1 .cpp
256	Paint House	1 .cpp
679	24 Game	1 .cpp
322	Coin Change	2 .cpp
912	Sort an Array	3 .py .js .cpp
39	Combination Sum	1 .cpp
1392	Longest Happy Prefix	1 .py
709	To Lower Case	3 .cpp .c
1006	Clumsy Factorial	1 .cpp
374	Guess Number Higher or Lower	2 .cpp
1133	Largest Unique Number	5 .py .js .cpp
1413	Minimum Value to Get Positive Step by Step Sum	1 .cpp	PREFIX	EASY
131	Palindrome Partitioning	1 .cpp	MEDIUM	DFS
922	Sort Array By Parity II	3 .cpp
16	3Sum Closest	1 .cpp
1410	HTML Entity Parser	1 .cpp	MEDIUM	STRING
23	Merge k Sorted Lists	1 .cpp	HARD	RECURSION DIVIDE-AND-CONQUER
1047	Remove All Adjacent Duplicates In String	4 .py .cpp
933	Number of Recent Calls	2 .java .cpp
1469	Find All the Lonely Nodes	1 .cpp	EASY	DFS
1119	Remove Vowels from a String	1 .cpp
438	Find All Anagrams in a String	2 .py .cpp
566	Reshape the Matrix	4 .cpp
811	Subdomain Visit Count	2 .cpp
13	Roman to Integer	2 .cpp
133	Clone Graph	2 .java .cpp
276	Paint Fence	1 .cpp
416	Partition Equal Subset Sum	1 .cpp	MEDIUM	DP DFS

Database

ID	Blog	Solutions	Diffculty	Tags
627	Swap Salary	2 .sql
608	Tree Node	4 .sql
577	Employee Bonus	1 .sql
584	Find Customer Referee	1 .sql
612	Shortest Distance in a Plane	4 .sql
619	Biggest Single Number	1 .sql
570	Managers with at Least 5 Direct Reports	2 .sql

Total 355 Questions: 7 Database, 348 Algorithms

Index generated by script at 24/10/2020 17:46:36