README.md

Algorithms

ID	Blog	Solutions	Diffculty	Tags
1220	Count Vowels Permutation	1 .cpp	HARD	DP
433	Minimum Genetic Mutation	1 .py	MEDIUM	BFS
942	DI String Match	2 .java .cpp
844	Backspace String Compare	3 .java .cpp .js
783	Minimum Distance Between BST Nodes	1 .py	EASY	RECURSION DFS
1087	Brace Expansion	2 .cpp
895	Maximum Frequency Stack	1 .cpp	HARD	STACK HASH MAP
367	Valid Perfect Square	4 .cpp
594	Longest Harmonious Subsequence	1 .cpp	EASY	HASH MAP
43	Multiply Strings	1 .java	MEDIUM	ARRAY
933	Number of Recent Calls	2 .java .cpp
150	Evaluate Reverse Polish Notation	1 .py	MEDIUM	STACK
791	Custom Sort String	2 .cpp
606	Construct String from Binary Tree	1 .cpp
237	Delete Node in a Linked List	1 .py	EASY	LINKED LIST
1232	Check If It Is a Straight Line	1 .cpp	EASY	GEOMETRY
1020	Partition Array Into Three Parts With Equal Sum	1 .cpp
1926	Nearest Exit from Entrance in Maze	1 .py	MEDIUM	BFS
1413	Minimum Value to Get Positive Step by Step Sum	1 .cpp	EASY	PREFIX SUM
350	Intersection of Two Arrays II	4 .java .cpp .js
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	2 .py	MEDIUM	BFS DFS GRAPH
876	Middle of the Linked List	2 .cpp
1137	N-th Tribonacci Number	2 .cpp
1528	Shuffle String	1 .py	EASY	STRING
2259	Remove Digit From Number to Maximize Result	1 .py	EASY	BRUTEFORCE
2248	Intersection of Multiple Arrays	1 .py	EASY	HASH MAP
347	Top K Frequent Elements	2 .cpp
125	Valid Palindrome	1 .cpp
393	UTF-8 Validation	1 .cpp
515	Find Largest Value in Each Tree Row	2 .cpp
389	Find the Difference	1 .py	EASY	XOR
2229	Check if an Array Is Consecutive	1 .py	EASY	SORTING
206	Reverse Linked List	1 .js	EASY	RECURSION LINKED LIST
2133	Check if Every Row and Column Contains All Numbers	1 .py	EASY	MATH
958	Check Completeness of a Binary Tree	2 .java .cpp
1314	Matrix Block Sum	1 .cpp	MEDIUM	DP
915	Partition Array into Disjoint Intervals	1 .cpp
516	Longest Palindromic Subsequence	1 .py	MEDIUM	DP
1248	Count Number of Nice Subarrays	1 .java	MEDIUM	PREFIX SUM
415	Add Strings	2 .py .cpp	EASY	MATH
929	Unique Email Addresses	3 .cpp .js	MEDIUM	HASH MAP
986	Interval List Intersections	1 .cpp	MEDIUM	TWO POINTER
392	Is Subsequence	1 .cpp
1360	Number of Days Between Two Dates	1 .cpp	EASY	DATE
1522	Diameter of N-Ary Tree	1 .cpp	MEDIUM	DFS
31	Next Permutation	1 .cpp
1935	Maximum Number of Words You Can Type	1 .py	EASY	HASH MAP
297	Serialize and Deserialize Binary Tree	1 .cpp
23	Merge k Sorted Lists	1 .cpp	HARD	RECURSION DIVIDE-AND-CONQUER
762	Prime Number of Set Bits in Binary Representation	2 .py .cpp
1884	Egg Drop With 2 Eggs and N Floors	1 .py	MEDIUM	DP
2446	Determine if Two Events Have Conflict	1 .py	EASY	MATH
133	Clone Graph	2 .java .cpp
1273	Delete Tree Nodes	1 .cpp
2582	Pass the Pillow	1 .py	EASY	MATH
340	Longest Substring with At Most K Distinct Characters	1 .cpp	HARD	TWO POINTER SLIDING WINDOW
693	Binary Number with Alternating Bits	2 .cpp
1396	Design Underground System	1 .cpp	MEDIUM	HASH MAP
988	Smallest String Starting From Leaf	1 .cpp	MEDIUM	DFS
663	Equal Tree Partition	1 .py	MEDIUM	DFS
171	Excel Sheet Column Number	1 .py	EASY
1295	Find Numbers with Even Number of Digits	1 .cpp	EASY	ARRAY
186	Reverse Words in a String II	2 .cpp
845	Longest Mountain in Array	1 .cpp	MEDIUM	ARRAY
1614	Maximum Nesting Depth of the Parentheses	1 .cpp	EASY	STRING
1404	Number of Steps to Reduce a Number in Binary Representation to One	1 .cpp	EASY	BINARY
559	Maximum Depth of N-ary Tree	1 .py	EASY	BFS
1624	Largest Substring Between Two Equal Characters	1 .cpp	EASY	HASH MAP
1008	Construct Binary Search Tree from Preorder Traversal	3 .java .cpp
148	Sort List	1 .cpp	MEDIUM	SORTING RECURSION DIVIDE-AND-CONQUER
50	Pow(x, n)	1 .cpp	MEDIUM	RECURSION
703	Kth Largest Element in a Stream	1 .cpp
536	Construct Binary Tree from String	1 .cpp
1472	Design Browser History	1 .cpp	MEDIUM	DEQUE
2544	Alternating Digit Sum	1 .py	EASY	MATH
348	Design Tic-Tac-Toe	1 .cpp
1485	Clone Binary Tree With Random Pointer	1 .cpp	MEDIUM	HASH MAP RECURSION
1991	Find the Middle Index in Array	1 .py	EASY	PREFIX SUM
11	Container With Most Water	1 .py	MEDIUM	TWO POINTER MATH
2160	Minimum Sum of Four Digit Number After Splitting Digits	1 .py	EASY	MATH
875	Koko Eating Bananas	1 .py	MEDIUM	BINARY SEARCH
872	Leaf-Similar Trees	1 .py	EASY	DFS
951	Flip Equivalent Binary Trees	2 .cpp
709	To Lower Case	3 .c .cpp
2129	Capitalize the Title	1 .py	EASY	TWO POINTER
1984	Minimum Difference Between Highest and Lowest of K Scores	1 .py	EASY	SORTING
49	Group Anagrams	2 .py .cpp	MEDIUM	SORTING
442	Find All Duplicates in an Array	1 .py	MEDIUM
201	Bitwise AND of Numbers Range	1 .cpp	MEDIUM	BIT
1249	Minimum Remove to Make Valid Parentheses	1 .cpp	MEDIUM	PARENTHESES GREEDY
1415	The k-th Lexicographical String of All Happy Strings of Length n	1 .cpp	MEDIUM	RECURSION DFS
2309	Greatest English Letter in Upper and Lower Case	1 .py	EASY	STRING
841	Keys and Rooms	1 .cpp
59	Spiral Matrix II	1 .java	MEDIUM	SIMULATION
1099	Two Sum Less Than K	2 .cpp
1876	Substrings of Size Three with Distinct Characters	1 .py	EASY	STRING
634	Find the Derangement of An Array	1 .py	MEDIUM	DP MATH
151	Reverse Words in a String	1 .cpp	MEDIUM	STRING
1800	Maximum Ascending Subarray Sum	1 .py	EASY	GREEDY
884	Uncommon Words from Two Sentences	2 .java
976	Largest Perimeter Triangle	3 .py .java .cpp	EASY	TRIANGLE GREEDY SORTING ARRAY
637	Average of Levels in Binary Tree	3 .cpp
1422	Maximum Score After Splitting a String	1 .cpp	EASY	PREFIX SUM
500	Keyboard Row	1 .py	EASY	HASH MAP
1100	Find K-Length Substrings With No Repeated Characters	2 .cpp
353	Design Snake Game	1 .cpp
647	Palindromic Substrings	2 .cpp
905	Sort Array By Parity	4 .cpp
1244	Design A Leaderboard	1 .cpp	MEDIUM	HASH MAP MULTI SET
339	Nested List Weight Sum	1 .cpp
653	Two Sum IV Input is a BST	6 .java .cpp
387	First Unique Character in a String	1 .py	EASY	HASH MAP
744	Find Smallest Letter Greater Than Target	4 .cpp .js
1230	Toss Strange Coins	1 .cpp
1605	Find Valid Matrix Given Row and Column Sums	1 .cpp	MEDIUM	GREEDY
680	Valid Palindrome II	1 .cpp
1018	Binary Prefix Divisible By 5	2 .java .cpp
671	Second Minimum Node In a Binary Tree	5 .java
1346	Check If N and Its Double Exist	1 .go	EASY	HASH MAP
2094	Finding 3-Digit Even Numbers	1 .py	EASY	MATH
1022	Sum of Root To Leaf Binary Numbers	2 .java .cpp
1026	Maximum Difference Between Node and Ancestor	1 .cpp
1897	Redistribute Characters to Make All Strings Equal	2 .py .go	EASY	STRING HASH MAP
167	Two Sum II - Input array is sorted	1 .py	EASY	TWO POINTER
1356	Sort Integers by The Number of 1 Bits	1 .cpp	EASY	SORTING BIT HACKS
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	1 .py	EASY	DFS
1973	Count Nodes Equal to Sum of Descendants	1 .py	MEDIUM	RECURSION DFS
1816	Truncate Sentence	1 .py	EASY	STRING
1710	Maximum Units on a Truck	1 .cpp	EASY	GREEDY
1005	Maximize Sum Of Array After K Negations	2 .cpp	EASY	PRIORITY QUEUE ARRAY
48	Rotate Image	1 .py	MEDIUM	MATH
1768	Merge Strings Alternately	1 .go	EASY	TWO POINTER
507	Perfect Number	2 .cpp
941	Valid Mountain Array	2 .java .cpp
1175	Prime Arrangements	1 .cpp
965	Univalued Binary Tree	2 .cpp
2006	Count Number of Pairs With Absolute Difference K	1 .py	EASY	HASH MAP
290	Word Pattern	1 .cpp	EASY	HASH MAP
1037	Valid Boomerang	3 .cpp
1903	Largest Odd Number in String	1 .py	EASY	GREEDY STRING
1002	Find Common Characters	2 .java .cpp	EASY	STRING ARRAY
2331	Evaluate Boolean Binary Tree	1 .py	EASY	RECURSION DFS
199	Binary Tree Right Side View	1 .py	MEDIUM	DFS
374	Guess Number Higher or Lower	2 .cpp
2177	Find Three Consecutive Integers That Sum to a Given Number	1 .py	MEDIUM	MATH
1006	Clumsy Factorial	1 .cpp
170	Two Sum III - Data structure design	3 .cpp	EASY	DESIGN
2124	Check if All A's Appears Before All B's	1 .py	EASY	STRING
830	Positions of Large Groups	2 .java .cpp
251	Flatten 2D Vector	2 .cpp
228	Summary Ranges	1 .cpp	MEDIUM	TWO POINTER
1436	Destination City	1 .cpp	EASY	TREE
166	Fraction to Recurring Decimal	1 .java	MEDIUM	HASH MAP MATH
874	Walking Robot Simulation	1 .cpp	EASY	HASH MAP SIMULATION
760	Find Anagram Mappings	3 .java .cpp
701	Insert into a Binary Search Tree	2 .cpp	MEDIUM	TREE RECURSION
1188	Design Bounded Blocking Queue	1 .py	MEDIUM	THREADING
650	2 Keys Keyboard	1 .py	MEDIUM	DP
508	Most Frequent Subtree Sum	1 .cpp
1399	Count Largest Group	1 .cpp	EASY
52	N-Queens II	1 .cpp	HARD	RECURSION BACKTRACKING DFS
1302	Deepest Leaves Sum	2 .cpp	MEDIUM	BFS DFS
1694	Reformat Phone Number	1 .py	EASY	STRING
1474	Delete N Nodes After M Nodes of a Linked List	1 .cpp	EASY	LINKED LIST
111	Minimum Depth of Binary Tree	1 .cpp	EASY	RECURSION DFS
1161	Maximum Level Sum of a Binary Tree	1 .cpp
334	Increasing Triplet Subsequence	2 .py .cpp	MEDIUM	MATH
1180	Count Substrings with Only One Distinct Letter	4 .cpp
108	Convert Sorted Array to Binary Search Tree	2 .cpp	EASY	RECURSION BINARY TREE
131	Palindrome Partitioning	1 .cpp	MEDIUM	DFS
812	Largest Triangle Area	1 .cpp
21	Merge Two Sorted Lists	4 .cpp
1281	Subtract the Product and Sum of Digits of an Integer	1 .cpp	EASY	MATH
582	Kill Process	2 .cpp
476	Number Complement	5 .java .cpp .js
1909	Remove One Element to Make the Array Strictly Increasing	1 .py	EASY	BINARY SEARCH MATH
873	Length of Longest Fibonacci Subsequence	2 .cpp	MEDIUM	DP BRUTEFORCE FIBONACCI LONGEST INCREASE SEQUENCE
1122	Relative Sort Array	3 .cpp
401	Binary Watch	1 .cpp
357	Count Numbers with Unique Digits	1 .py	MEDIUM	DP
1971	Find if Path Exists in Graph	1 .py	EASY	BFS GRAPH
1171	Remove Zero Sum Consecutive Nodes from Linked List	1 .cpp	MEDIUM	PREFIX SUM LINKED LIST
359	Logger Rate Limiter	2 .java .cpp
1207	Unique Number of Occurrences	1 .cpp
501	Find Mode in Binary Search Tree	3 .cpp
159	Longest Substring with At Most Two Distinct Characters	1 .cpp	MEDIUM	HASH MAP TWO POINTER SLIDING WINDOW
437	Path Sum III	1 .cpp
24	Swap Nodes in Pairs	1 .cpp	MEDIUM	RECURSION
973	K Closest Points to Origin	2 .java .cpp
451	Sort Characters By Frequency	2 .cpp
445	Add Two Numbers II	1 .cpp	MEDIUM	STACK LINKED LIST
520	Detect Capital	1 .js	EASY	REGEXP STRING
477	Total Hamming Distance	1 .cpp
684	Redundant Connection	1 .cpp	MEDIUM	UNION FIND
819	Most Common Word	2 .cpp
1602	Find Nearest Right Node in Binary Tree	1 .cpp	MEDIUM	BFS
1382	Balance a Binary Search Tree	1 .cpp	MEDIUM	RECURSION BINARY TREE
1837	Sum of Digits in Base K	1 .py	EASY	MATH
1261	Find Elements in a Contaminated Binary Tree	1 .cpp	MEDIUM	DFS
1365	How Many Numbers Are Smaller Than the Current Number	1 .cpp	EASY	BINARY SEARCH
1338	Reduce Array Size to The Half	1 .py	MEDIUM	HASH MAP
1725	Number Of Rectangles That Can Form The Largest Square	1 .py	EASY	MATH
1299	Replace Elements with Greatest Element on Right Side	1 .cpp	EASY	ARRAY
1047	Remove All Adjacent Duplicates In String	4 .py .cpp
1572	Matrix Diagonal Sum	1 .py	EASY	MATH
2485	Find the Pivot Integer	1 .py	EASY	MATH
2255	Count Prefixes of a Given String	1 .py	EASY	TRIE
814	Binary Tree Pruning	2 .cpp
1513	Number of Substrings With Only 1s	1 .py	MEDIUM	MATH
2022	Convert 1D Array Into 2D Array	1 .py	EASY	ARRAY
1791	Find Center of Star Graph	1 .py	MEDIUM	GRAPH
938	Range Sum of BST	2 .cpp
1253	Reconstruct a 2-Row Binary Matrix	1 .cpp	MEDIUM	GREEDY
219	Contains Duplicate II	1 .py	MEDIUM	SLIDING WINDOW
215	Kth Largest Element in an Array	2 .cpp	MEDIUM	BINARY SEARCH PARTITION ARRAY
706	Design HashMap	1 .py	MEDIUM	DESIGN
1550	Three Consecutive Odds	1 .py	EASY	MATH ARRAY
1046	Last Stone Weight	1 .java	EASY	PRIORITY QUEUE
541	Reverse String II	1 .cpp
98	Validate Binary Search Tree	1 .py	MEDIUM	RECURSION
804	Unique Morse Code Words	2 .java .cpp
856	Score of Parentheses	4 .cpp
1523	Count Odd Numbers in an Interval Range	1 .py	EASY	MATH
867	Transpose Matrix	1 .cpp
1680	Concatenation of Consecutive Binary Numbers	1 .cpp	MEDIUM	MATH
1317	Convert Integer to the Sum of Two No-Zero Integers	1 .java	EASY	BRUTEFORCE
5453	Running Sum of 1d Array	1 .cpp	EASY	PREFIX SUM
416	Partition Equal Subset Sum	1 .cpp	MEDIUM	DFS DP
859	Buddy Strings	1 .cpp
1539	Kth Missing Positive Number	1 .cpp	EASY	HASH MAP
55	Jump Game	1 .cpp	MEDIUM	GREEDY
441	Arranging Coins	1 .py	EASY	MATH
537	Complex Number Multiplication	2 .cpp .js
2099	Find Subsequence of Length K With the Largest Sum	1 .py	EASY	SLIDING WINDOW
452	Minimum Number of Arrows to Burst Balloons	1 .py	MEDIUM	GREEDY
1288	Remove Covered Intervals	1 .cpp	MEDIUM	SORTING LINE SWEEP
525	Contiguous Array	1 .cpp	MEDIUM	HASH MAP PREFIX SUM ARRAY
1221	Split a String in Balanced Strings	1 .cpp
377	Combination Sum IV	1 .py	MEDIUM	DP
1085	Sum of Digits in the Minimum Number	4 .py .cpp
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	1 .cpp	EASY	STRING
1502	Can Make Arithmetic Progression From Sequence	1 .cpp	EASY	SORTING
513	Find Bottom Left Tree Value	1 .py	MEDIUM	BFS
1920	Build Array from Permutation	1 .py	EASY	ARRAY
51	N-Queens	1 .cpp	HARD	RECURSION BACKTRACKING DFS
1941	Check if All Characters Have Equal Number of Occurrences	1 .go	EASY	HASH MAP
1208	Get Equal Substrings Within Budget	1 .cpp
33	Search in Rotated Sorted Array	2 .java .cpp
961	N-Repeated Element in Size 2N Array	12 .java .py .php .cpp .js
6	ZigZag Conversion	1 .cpp	MEDIUM	STRING SIMULATION
733	Flood Fill	2 .cpp
276	Paint Fence	1 .cpp
518	Coin Change 2	1 .cpp
922	Sort Array By Parity II	3 .cpp
37	Sudoku Solver	1 .cpp	HARD	BACKTRACKING DFS
101	Symmetric Tree	1 .py	EASY	RECURSION DFS
896	Monotonic Array	2 .cpp
322	Coin Change	2 .cpp
394	Decode String	1 .cpp
434	Number of Segments in a String	2 .py .cpp
1612	Check If Two Expression Trees are Equivalent	1 .cpp	MEDIUM	DFS
1304	Find N Unique Integers Sum up to Zero	1 .py	EASY	MATH
1874	Minimize Product Sum of Two Arrays	1 .go	MEDIUM	GREEDY
1120	Maximum Average Subtree	2 .py .cpp	MEDIUM	DFS
129	Sum Root to Leaf Numbers	1 .py	MEDIUM	BFS
1290	Convert Binary Number in a Linked List to Integer	1 .cpp	EASY	BINARY NUMBER LINKED LIST
492	Construct the Rectangle	3 .java
661	Image Smoother	2 .java .cpp
300	Longest Increasing Subsequence	1 .cpp
28	Implement strStr()	1 .cpp
2510	Check if There is a Path With Equal Number of 0's And 1's	1 .py	MEDIUM	DP
1812	Determine Color of a Chessboard Square	1 .cpp	EASY	MATH
2287	Rearrange Characters to Make Target String	1 .py	EASY	HASH MAP
205	Isomorphic Strings	1 .cpp
997	Find the Town Judge	1 .java
1328	Break a Palindrome	1 .js	MEDIUM
1135	Connecting Cities With Minimum Cost	2 .cpp
2553	Separate the Digits in an Array	1 .py	EASY	MATH
2558	Take Gifts From the Richest Pile	1 .py	EASY	HEAP
654	Maximum Binary Tree	2 .cpp
26	Remove Duplicates from Sorted Array	1 .py	EASY	TWO POINTER
1260	Shift 2D Grid	1 .cpp	EASY	GRID SIMULATION
969	Pancake Sorting	1 .cpp	MEDIUM	ARRAY
970	Powerful Integers	1 .cpp
1237	Find Positive Integer Solution for a Given Equation	2 .cpp	EASY	TWO POINTER BINARY SEARCH
609	Find Duplicate File in System	1 .js	MEDIUM	HASH MAP
633	Sum of Square Numbers	2 .cpp
1291	Sequential Digits	2 .cpp	MEDIUM	BFS DFS
47	Permutations II	1 .cpp	MEDIUM	HASH MAP DFS PERMUTATION
883	Projection Area of 3D Shapes	1 .cpp
747	Largest Number At Least Twice of Others	1 .cpp
1748	Sum of Unique Elements	1 .py	EASY	MATH
73	Set Matrix Zeroes	1 .py	MEDIUM	HASH MAP
307	Range Sum Query - Mutable	1 .py	MEDIUM	SQRT DECOMPOSITION MATH
1228	Missing Number In Arithmetic Progression	1 .cpp
1060	Missing Element in Sorted Array	2 .cpp
328	Odd Even Linked List	1 .cpp	MEDIUM	LINKED LIST
38	Count and Say	1 .py	MEDIUM	RECURSION
13	Roman to Integer	2 .cpp
482	License Key Formatting	2 .cpp
2481	Minimum Cuts to Divide a Circle	1 .py	EASY	MATH
686	Repeated String Match	2 .js
2011	Final Value of Variable After Performing Operations	1 .py	EASY	LAMBDA
1518	Water Bottles	1 .java	EASY	SIMULATION
94	Binary Tree Inorder Traversal	1 .py	EASY	RECURSION DFS
1339	Maximum Product of Splitted Binary Tree	1 .py	MEDIUM	DFS
110	Balanced Binary Tree	1 .cpp	EASY	RECURSION BINARY TREE
160	Intersection of Two Linked Lists	1 .cpp
2352	Equal Row and Column Pairs	1 .py	MEDIUM	HASH MAP
921	Minimum Add to Make Parentheses Valid	1 .cpp
1213	Intersection of Three Sorted Arrays	2 .py .cpp
1352	Product of the Last K Numbers	1 .cpp
1410	HTML Entity Parser	1 .cpp	MEDIUM	STRING
1218	Longest Arithmetic Subsequence of Given Difference	1 .cpp
1704	Determine if String Halves Are Alike	1 .cpp	EASY	STRING
2578	Split With Minimum Sum	3 .py	EASY	GREEDY SORTING PRIORITY QUEUE MATH HEAP
246	Strobogrammatic Number	2 .cpp
704	Binary Search	1 .java
3	Longest Substring Without Repeating Characters	1 .py	MEDIUM	TWO POINTER SLIDING WINDOW
2529	Maximum Count of Positive Integer and Negative Integer	1 .py	EASY	BINARY SEARCH
2443	Sum of Number and Its Reverse	1 .py	MEDIUM	BRUTEFORCE
543	Diameter of Binary Tree	1 .cpp	EASY	DFS RECURSION
589	N-ary Tree Preorder Traversal	1 .py	EASY	STACK
1952	Three Divisors	1 .py	EASY	MATH
89	Gray Code	1 .py	MEDIUM	RECURSION MATH
264	Ugly Number II	1 .py	MEDIUM	HEAP MATH
806	Number of Lines to Write String	3 .java .cpp
34	Find First and Last Position of Element in Sorted Array	3 .cpp .js
1215	Stepping Numbers	1 .cpp
679	24 Game	1 .cpp
1143	Longest Common Subsequence	1 .cpp	MEDIUM	DP
1265	Print Immutable Linked List in Reverse	2 .cpp	MEDIUM	STACK LINKED LIST RECURSION
1342	Number of Steps to Reduce a Number to Zero	2 .py .cpp	EASY	MATH
1796	Second Largest Digit in a String	1 .cpp	EASY	STRING HASH MAP
1282	Group the People Given the Group Size They Belong To	1 .cpp	MEDIUM	GREEDY HASH MAP
931	Minimum Falling Path Sum	1 .cpp
2265	Count Nodes Equal to Average of Subtree	1 .py	MEDIUM	DFS
384	Shuffle an Array	1 .py	MEDIUM	RANDOM
1491	Average Salary Excluding the Minimum and Maximum Salary	1 .cpp	EASY
669	Trim a Binary Search Tree	1 .cpp
2139	Minimum Moves to Reach Target Score	1 .py	MEDIUM	GREEDY
280	Wiggle Sort	2 .cpp
908	Smallest Range I	1 .cpp
999	Available Captures for Rook	1 .cpp
914	X of a Kind in a Deck of Cards	1 .py	EASY	GCD MATH
117	Populating Next Right Pointers in Each Node II	1 .py	MEDIUM	BFS
1118	Number of Days in a Month	1 .cpp
1200	Minimum Absolute Difference	2 .py .cpp	EASY	SORTING
860	Lemonade Change	1 .cpp
2490	Circular Sentence	1 .py	EASY	STRING
254	Factor Combinations	3 .py .cpp	MEDIUM	DFS
985	Sum of Even Numbers After Queries	2 .java .js
230	Kth Smallest Element in a BST	9 .py .java .cpp	MEDIUM	RECURSION
1003	Check If Word Is Valid After Substitutions	1 .cpp	MEDIUM	STACK
821	Shortest Distance to a Character	2 .cpp
1447	Simplified Fractions	1 .py	MEDIUM	GCD MATH
103	Binary Tree Zigzag Level Order Traversal	3 .py .cpp	MEDIUM	BFS
1458	Max Dot Product of Two Subsequences	1 .cpp	HARD	DP
1387	Sort Integers by The Power Value	1 .cpp	MEDIUM	RECURSION DP
766	Toeplitz Matrix	2 .cpp
2348	Number of Zero-Filled Subarrays	1 .py	MEDIUM	MATH
836	Rectangle Overlap	1 .cpp	EASY	GEOMETRY
409	Longest Palindrome	2 .py .cpp	EASY	HASH MAP
16	3Sum Closest	1 .cpp
252	Meeting Rooms	2 .cpp
1832	Check if the Sentence Is Pangram	1 .py	EASY	STRING HASH MAP
1929	Concatenation of Array	1 .py	EASY	ARRAY
1925	Count Square Sum Triples	1 .py	EASY	MATH
325	Maximum Size Subarray Sum Equals k	5 .cpp
207	Course Schedule	1 .py	MEDIUM	TOPOLOGICAL SORT GRAPH
242	Valid Anagram	1 .cpp	EASY	STRING HASH MAP
1027	Longest Arithmetic Sequence	1 .cpp	MEDIUM	DP
593	Valid Square	2 .java .cpp
743	Network Delay Time	1 .py	MEDIUM	GRAPH
39	Combination Sum	1 .cpp
342	Power of Four	2 .cpp
1071	Greatest Common Divisor of Strings	1 .cpp
1470	Shuffle the Array	1 .go	EASY	ARRAY
1272	Remove Interval	1 .cpp	MEDIUM	INTERVAL
2185	Counting Words With a Given Prefix	1 .py	EASY	STRING
2427	Number of Common Factors	1 .py	EASY	GCD MATH
346	Moving Average from Data Stream	1 .cpp	EASY	DEQUE
1490	Clone N-ary Tree	1 .cpp	MEDIUM	RECURSION HASH MAP DFS
27	Remove Element	1 .py	EASY	TWO POINTER
1190	Reverse Substrings Between Each Pair of Parentheses	1 .cpp
96	Unique Binary Search Trees	1 .py	MEDIUM	DP MATH
2409	Count Days Spent Together	1 .py	MEDIUM	LINE SWEEP
724	Find Pivot Index	2 .cpp
700	Search in a Binary Search Tree	6 .java .cpp .js
1133	Largest Unique Number	5 .py .cpp .js
1392	Longest Happy Prefix	1 .py
532	K-diff Pairs in an Array	3 .cpp
967	Numbers With Same Consecutive Differences	1 .py	MEDIUM	DFS
1165	Single-Row Keyboard	2 .cpp	EASY	STRING HASH MAP
1134	Armstrong Number	1 .py
217	Contains Duplicate	1 .js	EASY	HASH MAP
329	Longest Increasing Path in a Matrix	1 .py	HARD	DP
1119	Remove Vowels from a String	1 .cpp
121	Best Time to Buy and Sell Stock	1 .py	EASY	MATH
538	Convert BST to Greater Tree	2 .cpp
82	Remove Duplicates from Sorted List II	1 .cpp	MEDIUM	LINKED LIST
144	Binary Tree Preorder Traversal	1 .rs	EASY	RECURSION DFS
2436	Minimum Split Into Subarrays With GCD Greater Than One	1 .py	MEDIUM	GREEDY
949	Largest Time for Given Digits	1 .cpp	EASY	PERMUTATION
1017	Convert to Base -2	2 .cpp
1400	Construct K Palindrome Strings	1 .cpp	MEDIUM	PALINDROME BITSET
869	Reordered Power of 2	1 .py	MEDIUM	MATH PERMUTATION
758	Bold Words in String	1 .cpp
566	Reshape the Matrix	4 .cpp
1110	Delete Nodes And Return Forest	1 .cpp
892	Surface Area of 3D Shapes	3 .py .cpp	EASY	GEOMETRY MATH COUNTING
2165	Smallest Value of the Rearranged Number	1 .py	MEDIUM	SORTING
189	Rotate Array	1 .py	MEDIUM	ARRAY
993	Cousins in Binary Tree	2 .cpp
557	Reverse Words in a String III	3 .java .cpp
991	Broken Calculator	1 .cpp
842	Split Array into Fibonacci Sequence	1 .cpp
216	Combination Sum III	1 .py	MEDIUM	DFS MATH
113	Path Sum II	2 .js	MEDIUM	DFS QUEUE BINARY TREE BFS RECURSION
2549	Count Distinct Numbers on Board	1 .py	EASY	MATH
2164	Sort Even and Odd Indices Independently	1 .py	EASY	SORTING
18	4Sum	1 .cpp
2032	Two Out of Three	1 .py	EASY	HASH MAP
105	Construct Binary Tree from Preorder and Inorder Traversal	1 .cpp
1275	Find Winner on a Tic Tac Toe Game	1 .cpp	EASY	BRUTEFORCE GAME
250	Count Univalue Subtrees	5 .java .cpp
106	Construct Binary Tree from Inorder and Postorder Traversal	2 .cpp
917	Reverse Only Letters	3 .java .cpp
2506	Count Pairs Of Similar Strings	1 .rs	EASY	HASH MAP MATH
560	Subarray Sum Equals K	4 .cpp
362	Design Hit Counter	2 .cpp
797	All Paths From Source to Target	1 .py	MEDIUM	DFS GRAPH
994	Rotting Oranges	1 .cpp	EASY	BFS
1344	Angle Between Hands of a Clock	1 .cpp	MEDIUM	GEOMETRY
2149	Rearrange Array Elements by Sign	1 .py	MEDIUM	ARRAY
1437	Check If All 1's Are at Least Length K Places Away	1 .cpp	MEDIUM	ARRAY
1880	Check if Word Equals Summation of Two Words	1 .py	EASY	MATH
5087	Letter Tile Possibilities	1 .cpp
987	Vertical Order Traversal of a Binary Tree	1 .cpp
953	Verifying an Alien Dictionary	1 .cpp
1021	Remove Outermost Parentheses	1 .cpp
889	Construct Binary Tree from Preorder and Postorder Traversal	1 .cpp	MEDIUM	RECURSION
2437	Number of Valid Clock Times	1 .py	EASY	MATH
120	Triangle	1 .py	MEDIUM	DP
1886	Determine Whether Matrix Can Be Obtained By Rotation	1 .py	EASY	MATH
1854	Maximum Population Year	1 .cpp	EASY	LINE SWEEP
572	Subtree of Another Tree	2 .cpp
946	Validate Stack Sequences	1 .cpp	MEDIUM	STACK GREEDY
1128	Number of Equivalent Domino Pairs	1 .cpp
366	Find Leaves of Binary Tree	3 .py .java .cpp	MEDIUM	DFS
1315	Sum of Nodes with Even-Valued Grandparent	1 .java	MEDIUM	RECURSION DFS
9	Palindrome Number	1 .cpp	EASY
937	Reorder Data in Log Files	1 .cpp	EASY	SORTING
22	Generate Parentheses	2 .cpp
146	LRU Cache	1 .cpp	MEDIUM	LINKED LIST LRU
742	Closest Leaf in a Binary Tree	1 .py	MEDIUM	BFS DFS GRAPH
74	Search a 2D Matrix	3 .cpp
2264	Largest 3-Same-Digit Number in String	1 .py	EASY	BRUTEFORCE MATH
690	Employee Importance	4 .java .cpp
1558	Minimum Numbers of Function Calls to Make Target Array	1 .cpp	MEDIUM	MATH
1160	Find Words That Can Be Formed by Characters	1 .cpp
1154	Day of the Year	1 .cpp	EASY	DATE MATH
1570	Dot Product of Two Sparse Vectors	1 .cpp
1380	Lucky Numbers in a Matrix	1 .cpp	EASY	MATRIX
190	Reverse Bits	1 .py	EASY	MATH
408	Valid Word Abbreviation	1 .cpp
1822	Sign of the Product of an Array	1 .go	EASY	MATH
77	Combinations	1 .py	MEDIUM	BITMASK
1080	Insufficient Nodes in Root to Leaf Paths	1 .java
2293	Min Max Game	1 .py	EASY	RECURSION
1469	Find All the Lonely Nodes	1 .cpp	EASY	DFS
1222	Queens That Can Attack the King	1 .cpp	MEDIUM	HASH MAP ARRAY
1184	Distance Between Bus Stops	1 .py	EASY	GRAPH MATH
1196	How Many Apples Can You Put into the Basket	1 .cpp
256	Paint House	1 .cpp
311	Sparse Matrix Multiplication	1 .cpp
1094	Car Pooling	2 .cpp	MEDIUM	GREEDY HASH MAP
139	Word Break	1 .py	MEDIUM	DFS
643	Maximum Average Subarray I	4 .java .cpp .js
681	Next Closest Time	1 .cpp
1598	Crawler Log Folder	1 .cpp	EASY	SIMULATION
12	Integer to Roman	1 .py	MEDIUM	STRING MATH
1185	Day of the Week	1 .cpp
15	3Sum	2 .cpp
266	Palindrome Permutation	2 .cpp
1566	Detect Pattern of Length M Repeated K or More Times	1 .py	EASY	BRUTEFORCE
91	Decode Ways	1 .cpp
504	Base 7	3 .cpp
746	Min Cost Climbing Stairs	2 .cpp
247	Strobogrammatic Number II	1 .cpp	MEDIUM	RECURSION
443	String Compression	1 .cpp
56	Merge Intervals	1 .py	MEDIUM	MATH
1325	Delete Leaves With a Given Value	1 .java	MEDIUM	DFS RECURSION BINARY TREE
395	Longest Substring with At Least K Repeating Characters	1 .cpp	MEDIUM	DIVIDE-AND-CONQUER
1167	Minimum Cost to Connect Sticks	2 .py .cpp
1492	The kth Factor of n	1 .cpp	MEDIUM
1362	Closest Divisors	1 .cpp	MEDIUM	MATH
1506	Find Root of N-Ary Tree	1 .cpp	MEDIUM	HASH MAP
438	Find All Anagrams in a String	2 .py .cpp
261	Graph Valid Tree	2 .cpp
944	Delete Columns to Make Sorted	1 .cpp
1805	Number of Different Integers in a String	1 .py	EASY	STRING
1197	Minimum Knight Moves	1 .py	MEDIUM	DP
811	Subdomain Visit Count	2 .cpp
628	Maximum Product of Three Numbers	2 .cpp
897	Increasing Order Search Tree	4 .py .cpp	EASY	RECURSION
645	Set Mismatch	3 .cpp
912	Sort an Array	3 .py .cpp .js

Database

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

Total 516 Questions: 8 Database, 508 Algorithms

By Difficulty

• MEDIUM
• EASY
• HARD

By Programming Language

• .cpp
• .py
• .java
• .js
• .c
• .go
• .sql
• .php
• .rs

By Tag

• DP
• BFS
• RECURSION
• DFS
• STACK
• HASH MAP
• ARRAY
• LINKED LIST
• GEOMETRY
• PREFIX SUM
• GRAPH
• STRING
• BRUTEFORCE
• XOR
• SORTING
• MATH
• TWO POINTER
• DATE
• DIVIDE-AND-CONQUER
• SLIDING WINDOW
• BINARY
• DEQUE
• BINARY SEARCH
• BIT
• PARENTHESES
• GREEDY
• SIMULATION
• TRIANGLE
• MULTI SET
• BIT HACKS
• PRIORITY QUEUE
• DESIGN
• TREE
• THREADING
• BACKTRACKING
• SQL
• BINARY TREE
• FIBONACCI
• LONGEST INCREASE SEQUENCE
• REGEXP
• UNION FIND
• TRIE
• PARTITION
• LINE SWEEP
• BINARY NUMBER
• HEAP
• GRID
• PERMUTATION
• SQRT DECOMPOSITION
• LAMBDA
• RANDOM
• GCD
• TOPOLOGICAL SORT
• INTERVAL
• PALINDROME
• BITSET
• COUNTING
• QUEUE
• GAME
• LRU
• MATRIX
• BITMASK

Index generated by script at 25/03/2023 13:51:58