Q No.	Difficulty	Category	Question	Solution
01	Medium	Arrays	4Sum II	Answer
02	Medium	Arrays	Arithmetic Subarrays	Answer
03	Medium	Arrays	Beautiful Array	Answer
04	Easy	Arrays	Can Place Flowers	Answer
05	Easy	Arrays	Convert 1D Array Into 2D Array	Answer
06	Medium	Arrays	Convert an Array Into a 2D Array	Answer
07	Medium	Arrays	Count Inversions	Answer
08	Medium	Arrays	Diagonal Traverse	Answer
09	Medium	Arrays	Difference between Ones and Zeroes	Answer
10	Medium	Arrays	Equal Row And Column Pairs	Answer
11	Medium	Arrays	Find All Duplicates in an Array	Answer
12	Medium	Arrays	Find the Winner of the Circular Game	Answer
13	Hard	Arrays	First Missing Positive	Answer
14	Medium	Arrays	Flip String to Monotone Increasing	Answer
15	Medium	Arrays	Game Of Life	Answer
16	Medium	Arrays	Get Biggest Three Rhombus Sums in a Grid	Answer
17	Medium	Arrays	K Divisible Elements Subarrays	Answer
18	Medium	Arrays	Last Moment Before All Ants Fall Out of a Plank	Answer
19	Medium	Arrays	Longest Consecutive Sequence	Answer
20	Medium	Arrays	Maximum Consecutive Floors Without Special Floors	Answer
21	Medium	Arrays	Maximum Matrix Sum	Answer
22	Medium	Arrays	Maximum Subarray	Answer
23	Medium	Arrays	Maximum Sum of an Hourglass	Answer
24	Medium	Arrays	Minimum Absolute Sum Difference	Answer
25	Easy	Arrays	Monotonic Array	Answer
26	Medium	Arrays	Product of Arrays Except Self	Answer
27	Medium	Arrays	Query Kth Smallest Trimmed Number	Answer
28	Easy	Arrays	Remove Duplicates	Answer
29	Easy	Arrays	Remove One Element To Make The Array Strictly Increasing	Answer
30	Medium	Arrays	Repeat and Missing Number Array	Answer
31	Hard	Arrays	Reverse Pairs	Answer
32	Medium	Arrays	Rotate Image	Answer
33	Medium	Arrays	Rotating The Box	Answer
34	Medium	Arrays	Set Matrix Zeroes	Answer
35	Easy	Arrays	Sort Array By Parity	Answer
36	Medium	Arrays	Spiral Matrix II	Answer
37	Medium	Arrays	Spiral Matrix	Answer
38	Hard	Arrays	Subarrays with K Different Integers	Answer
39	Medium	Arrays	Top K Frequent Elements	Answer
40	Easy	Arrays	Two Sum	Answer
41	Medium	Arrays	Valid Sudoku	Answer
42	Medium	BFS	01 Matrix	Answer
43	Medium	BFS	All Nodes Distance K In Binary Tree	Answer
44	Medium	BFS	As Far from Land as Possible	Answer
45	Easy	BFS	Average Of Levels In Binary Tree	Answer
46	Medium	BFS	Binary Tree Level Order Traversal Ii	Answer
47	Medium	BFS	Binary Tree Level Order Traversal	Answer
48	Medium	BFS	Binary Tree Right Side View	Answer
49	Medium	BFS	Binary Tree Zigzag Level Order Traversal	Answer
50	Medium	BFS	Clone Graph	Answer
51	Medium	BFS	Find Largest Value in Each Tree Row	Answer
52	Easy	BFS	Find if Path Exists in Graph	Answer
53	Easy	BFS	Flood Fill	Answer
54	Medium	BFS	Invert Binary Tree	Answer
55	Hard	BFS	Jump Game IV	Answer
56	Medium	BFS	Keys and Rooms	Answer
57	Medium	BFS	Max Area Of Island	Answer
58	Medium	BFS	Maximum Width Of Binary Tree	Answer
59	Easy	BFS	Minimum Depth Of Binary Tree	Answer
60	Medium	BFS	Minimum Genetic Mutation	Answer
61	Medium	BFS	Nearest Exit from Entrance in Maze	Answer
62	Medium	BFS	Number Of Islands	Answer
63	Medium	BFS	Number of Closed Islands	Answer
64	Medium	BFS	Open the Lock	Answer
65	Hard	BFS	Pacific Atlantic Water Flow	Answer
66	Medium	BFS	Populating Next Right Pointers In Each Node Ii	Answer
67	Medium	BFS	Shortest Bridge	Answer
68	Medium	BFS	Shortest Path in Binary Matrix	Answer
69	Medium	BFS	Shortest Path with Alternating Colors	Answer
70	Medium	BFS	Step By Step Directions From A Binary Tree Node To Another	Answer
71	Hard	BFS	Word Ladder II	Answer
72	Hard	BFS	Word Ladder	Answer
73	Medium	Backtracking	All Paths From Source To Target	Answer
74	Medium	Backtracking	Beautiful Arrangement	Answer
75	Medium	Backtracking	Combination Sum III	Answer
76	Medium	Backtracking	Combination Sum	Answer
77	Medium	Backtracking	Combinations	Answer
78	Medium	Backtracking	Generate Parentheses	Answer
79	Medium	Backtracking	Letter Combinations Of A Phone Number	Answer
80	Medium	Backtracking	Maximum Length of a Concatenated String with Unique Characters	Answer
81	Hard	Backtracking	N Queens Ii	Answer
82	Medium	Backtracking	Palindrome Partitioning	Answer
83	Medium	Backtracking	Partition to K Equal Sum Subsets	Answer
84	Medium	Backtracking	Permutations Ii	Answer
85	Medium	Backtracking	Permutations	Answer
86	Medium	Backtracking	Restore IP Addresses	Answer
87	Medium	Backtracking	Split A String Into The Max Number Of Unique Substrings*	Answer
88	Medium	Backtracking	Splitting a String Into Descending Consecutive Values	Answer
89	Medium	Backtracking	Subsets	Answer
90	Hard	Backtracking	Sudoku Solver*	Answer
91	Hard	Backtracking	Unique Paths III	Answer
92	Medium	Backtracking	Word Search	Answer
93	Easy	Binary Search	Arranging Coins	Answer
94	Medium	Binary Search	Capacity To Ship Packages Within D Days	Answer
95	Hard	Binary Search	Count Good Triplets in an Array	Answer
96	Hard	Binary Search	Data Stream as Disjoint Intervals	Answer
97	Medium	Binary Search	Find First And Last Position Of Element In Sorted Array	Answer
98	Hard	Binary Search	Find K-th Smallest Pair Distance	Answer
99	Medium	Binary Search	Find Minimum In Rotated Sorted Array	Answer
100	Medium	Binary Search	Find Peak Element	Answer
101	Easy	Binary Search	Find Smallest Letter Greater Than Target	Answer
102	Hard	Binary Search	Find in Mountain Array	Answer
103	Hard	Binary Search	Find the Longest Valid Obstacle Course at Each Position	Answer
104	Easy	Binary Search	First Bad Version	Answer
105	Easy	Binary Search	Guess Number Higher or Lower	Answer
106	Medium	Binary Search	Koko Eating Bananas	Answer
107	Hard	Binary Search	Median of Two Sorted Arrays*	Answer
108	Hard	Binary Search	Minimum Number of Operations to Make Array Continuous	Answer
109	Medium	Binary Search	Number of Subsequences That Satisfy the Given Sum Condition	Answer
110	Medium	Binary Search	Peak Index In A Mountain Array	Answer
111	Easy	Binary Search	Range Sum Of Bst	Answer
112	Medium	Binary Search	Search A 2D Matrix	Answer
113	Medium	Binary Search	Search In Rotated Sorted Array*	Answer
114	Easy	Binary Search	Search Insert Position	Answer
115	Medium	Binary Search	Single Element in a Sorted Array	Answer
116	Medium	Binary Search	Snapshot Array	Answer
117	Medium	Binary Search	Tweet Counts Per Frequency	Answer
118	Medium	Binary Search	Two Sum II - Input Array Is Sorted	Answer
119	Medium	Binary Tree	Maximum Level Sum of a Binary Tree	Answer
120	Easy	Binary Tree	Minimum Absolute Difference in BST	Answer
121	Easy	Bit Manipulation	Counting Bits	Answer
122	Medium	Bit Manipulation	Gray Code	Answer
123	Medium	Bit Manipulation	Longest Nice Subarray	Answer
124	Easy	Bit Manipulation	Minimum Bit Flips To Convert Number	Answer
125	Medium	Bit Manipulation	Minimum Number of Operations to Make Array XOR Equal to K	Answer
126	Easy	Bit Manipulation	Missing Number	Answer
127	Hard	Bit Manipulation	Non-negative Integers without Consecutive Ones	Answer
128	Medium	Bit Manipulation	Reverse Integer	Answer
129	Easy	Bit Manipulation	Single Number	Answer
130	Medium	Bit Manipulation	Subsets	Answer
131	Medium	Bucket-Sort	Top K Frequent Elements	Answer
132	Medium	DFS	All Nodes Distance K In Binary Tree	Answer
133	Easy	DFS	Balanced Binary Tree	Answer
134	Hard	DFS	Concatenated Words	Answer
135	Medium	DFS	Construct Binary Tree From Preorder And Inorder Traversal	Answer
136	Easy	DFS	Diameter Of Binary Tree	Answer
137	Medium	DFS	Find If Path Exists In Graph	Answer
138	Easy	DFS	Invert Binary Tree	Answer
139	Medium	DFS	Is Graph Bipartite?	Answer
140	Medium	DFS	Kth Smallest Element In A Bst	Answer
141	Medium	DFS	Lexicographically Smallest Equivalent String	Answer
142	Hard	DFS	Longest Path With Different Adjacent Characters	Answer
143	Medium	DFS	Longest ZigZag Path in a Binary Tree	Answer
144	Easy	DFS	Lowest Common Ancestor Of A Binary Search Tree	Answer
145	Medium	DFS	Lowest Common Ancestor Of A Binary Tree	Answer
146	Medium	DFS	Maximum Binary Tree	Answer
147	Easy	DFS	Maximum Depth Of Binary Tree	Answer
148	Easy	DFS	Merge Two Binary Trees	Answer
149	Medium	DFS	Minimum Fuel Cost to Report to the Capital	Answer
150	Medium	DFS	Minimum Time to Collect All Apples in a Tree	Answer
151	Medium	DFS	Most Stones Removed with Same Row or Column	Answer
152	Medium	DFS	Number Of Islands	Answer
153	Medium	DFS	Number Of Operations To Make Network Connected	Answer
154	Medium	DFS	Number of Provinces	Answer
155	Medium	DFS	Pacific Atlantic Water Flow	Answer
156	Medium	DFS	Path Sum Ii	Answer
157	Medium	DFS	Path Sum Iii	Answer
158	Easy	DFS	Path Sum	Answer
159	Medium	DFS	Possible Bipartition	Answer
160	Medium	DFS	Reachable Nodes With Restrictions	Answer
161	Easy	DFS	Same Tree	Answer
162	Hard	DFS	Similar String Groups	Answer
163	Easy	DFS	Subtree Of Another Tree	Answer
164	Medium	DFS	Surrounded Regions	Answer
165	Medium	DFS	Time Needed to Inform All Employees	Answer
166	Medium	DFS	Validate Binary Search Tree	Answer
167	Medium	Design	Binary Search Tree Iterator	Answer
168	Medium	Design	Design Add and Search Words Data Structure	Answer
169	Medium	Design	Design Circular Queue	Answer
170	Easy	Design	Design Parking System	Answer
171	Medium	Design	Design Twitter	Answer
172	Medium	Design	Design Underground System	Answer
173	Medium	Design	Design a Food Rating System	Answer
174	Medium	Design	Design a Number Container System	Answer
175	Medium	Design	Design a Stack With Increment Operation	Answer
176	Hard	Design	Find Median From Data Stream	Answer
177	Medium	Design	Implement Trie (Prefix Tree)	Answer
178	Medium	Design	Insert Delete GetRandom O(1)	Answer
179	Hard	Design	LFU Cache	Answer
180	Medium	Design	LRU Cache	Answer
181	Medium	Design	Min Stack	Answer
182	Hard	Design	My Calendar III	Answer
183	Medium	Design	Online Election	Answer
184	Medium	Design	Peeking Iterator	Answer
185	Medium	Design	Serialize and Deserialize BST	Answer
186	Medium	Design	Time Based Key-Value Store	Answer
187	Medium	Dijkstra's Algorithm	Cheapest Flights Within K Stops	Answer
188	Medium	Dijkstra's Algorithm	Find The City With The Smallest Number Of Neighbors At A Threshold Distance	Answer
189	Medium	Dijkstra's Algorithm	Minimum Path Sum	Answer
190	Medium	Dijkstra's Algorithm	Network Delay Time	Answer
191	Medium	Dijkstra's Algorithm	Number Of Restricted Paths From First To Last Node	Answer
192	Medium	Dijkstra's Algorithm	Number Of Ways To Arrive At Destination	Answer
193	Medium	Dijkstra's Algorithm	Path With Maximum Probability	Answer
194	Medium	Dijkstra's Algorithm	Path With Minimum Effort	Answer
195	Medium	Dijkstra's Algorithm	Shortest Path In Binary Matrix	Answer
196	Medium	Divide & Conquer	Construct Binary Tree from Inorder and Postorder Traversal	Answer
197	Medium	Divide & Conquer	Longest Substring with At Least K Repeating Characters	Answer
198	Hard	Divide & Conquer	Number of Pairs Satisfying Inequality	Answer
199	Medium	Divide & Conquer	Search a 2D Matrix II	Answer
200	Medium	Dynamic Programming	Airplane Seat Assignment Probability	Answer
201	Hard	Dynamic Programming	Arithmetic Slices II - Subsequence	Answer
202	Medium	Dynamic Programming	Best Team With No Conflicts	Answer
203	Medium	Dynamic Programming	Best Time to Buy and Sell Stock with Cooldown	Answer
204	Hard	Dynamic Programming	Build Array Where You Can Find The Maximum Exactly K Comparisons	Answer
205	Medium	Dynamic Programming	Champagne Tower	Answer
206	Easy	Dynamic Programming	Climbing Stairs	Answer
207	Medium	Dynamic Programming	Coin Change 2	Answer
208	Medium	Dynamic Programming	Coin Change	Answer
209	Hard	Dynamic Programming	Constrained Subsequence Sum	Answer
210	Hard	Dynamic Programming	Count Vowels Permutation	Answer
211	Medium	Dynamic Programming	Decode Ways	Answer
212	Medium	Dynamic Programming	Domino and Tromino Tiling	Answer
213	Hard	Dynamic Programming	Edit Distance	Answer
214	Medium	Dynamic Programming	Fibonacci Number	Answer
215	Easy	Dynamic Programming	Get Maximum In Generated Array	Answer
216	Medium	Dynamic Programming	House Robber II	Answer
217	Medium	Dynamic Programming	House Robber III	Answer
218	Medium	Dynamic Programming	House Robber	Answer
219	Medium	Dynamic Programming	Integer Break	Answer
220	Medium	Dynamic Programming	Interleaving String	Answer
221	Easy	Dynamic Programming	Is Subsequence	Answer
222	Medium	Dynamic Programming	Jump Game	Answer
223	Medium	Dynamic Programming	Largest Divisible Subset	Answer
224	Medium	Dynamic Programming	Longest Common Subsequence	Answer
225	Medium	Dynamic Programming	Longest Increasing Subsequence	Answer
226	Medium	Dynamic Programming	Longest String Chain	Answer
227	Hard	Dynamic Programming	Make Array Strictly Increasing	Answer
228	Medium	Dynamic Programming	Maximal Square	Answer
229	Medium	Dynamic Programming	Maximum Length of Repeated Subarray	Answer
230	Hard	Dynamic Programming	Maximum Number of Non-overlapping Palindrome Substrings	Answer
231	Medium	Dynamic Programming	Maximum Points in an Archery Competition	Answer
232	Medium	Dynamic Programming	Maximum Product Subarray	Answer
233	Hard	Dynamic Programming	Maximum Profit in Job Scheduling	Answer
234	Medium	Dynamic Programming	Maximum Sum Circular Subarray	Answer
235		Dynamic Programming	Medium	Answer
236	Medium	Dynamic Programming	Minimum Deletions To Make String Balanced	Answer
237	Hard	Dynamic Programming	Minimum Falling Path Sum II	Answer
238	Medium	Dynamic Programming	Minimum Path Sum	Answer
239	Easy	Dynamic Programming	N Th Tribonacci Number	Answer
240	Medium	Dynamic Programming	Number Of Restricted Paths From First To Last Node	Answer
241	Medium	Dynamic Programming	Number Of Ways To Arrive At Destination	Answer
242	Medium	Dynamic Programming	Number of Dice Rolls With Target Sum	Answer
243	Medium	Dynamic Programming	Number of People Aware of a Secret	Answer
244	Hard	Dynamic Programming	Number of Ways to Divide a Long Corridor	Answer
245	Hard	Dynamic Programming	Number of Ways to Separate Numbers	Answer
246	Hard	Dynamic Programming	Number of Ways to Stay in the Same Place After Some Steps	Answer
247	Medium	Dynamic Programming	Partition Equal Subset Sum*	Answer
248	Easy	Dynamic Programming	Pascals Triangle Ii	Answer
249	Medium	Dynamic Programming	Perfect Squares	Answer
250	Medium	Dynamic Programming	Pow(x, n)	Answer
251	Hard	Dynamic Programming	Profitable Schemes	Answer
252		Dynamic Programming	Rotate Function	Answer
253	Medium	Dynamic Programming	Sort Integers By The Power Value	Answer
254	Medium	Dynamic Programming	Super Ugly Number	Answer
255	Hard	Dynamic Programming	Trapping Rain Water	Answer
256	Medium	Dynamic Programming	Ugly Number Ii	Answer
257	Medium	Dynamic Programming	Unique Binary Search Trees	Answer
258	Medium	Dynamic Programming	Unique Paths II	Answer
259	Medium	Dynamic Programming	Unique Paths	Answer
260	Medium	Dynamic Programming	Where Will the Ball Fall	Answer
261	Medium	Dynamic Programming	Wiggle Subsequence	Answer
262	Medium	Dynamic Programming	Word Break	Answer
263	Medium	Famous Algorithms	Fisher-Yates Algorithm	Answer
264	Medium	Famous Algorithms	Floyd's Cycle Detection	Answer
265	Medium	Famous Algorithms	Kadane's Algorithm	Answer
266	Easy	Famous Algorithms	Moore's Voting Algorithm	Answer
267	Medium	Famous Algorithms	Prim's Algorithm	Answer
268	Medium	Famous Algorithms	Sieve of Eratosthenes	Answer
269	Easy	Fast & Slow Pointers	Happy Number	Answer
270	Medium	Fast & Slow Pointers	Linked List Cycle Ii	Answer
271	Medium	Fast & Slow Pointers	Remove Nth Node From End Of List	Answer
272	Medium	Fast & Slow Pointers	Sort List	Answer
273	Medium	Graph	Evaluate Division*	Answer
274	Medium	Graph	Minimum Number of Vertices to Reach All Nodes	Answer
275	Medium	Graph	Possible Bipartition*	Answer
276	Medium	Graph	Rotting Oranges	Answer
277	Medium	Graph	Surrounded Regions	Answer
278	Medium	Greedy	Advantage Shuffle	Answer
279	Medium	Greedy	Array With Elements Not Equal to Average of Neighbors	Answer
280	Medium	Greedy	Best Time to Buy and Sell Stock II	Answer
281	Medium	Greedy	Boats To Save People	Answer
282	Hard	Greedy	Candy	Answer
283	Medium	Greedy	Dota2 Senate	Answer
284	Medium	Greedy	Gas Station	Answer
285	Medium	Greedy	Increasing Triplet Subsequence	Answer
286	Medium	Greedy	Jump Game II	Answer
287	Medium	Greedy	Jump Game	Answer
288	Easy	Greedy	Lemonade Change	Answer
289	Medium	Greedy	Longest Happy String	Answer
290	Easy	Greedy	Maximum 69 Number	Answer
291	Medium	Greedy	Maximum Matching of Players With Trainers	Answer
292	Medium	Greedy	Maximum Number Of Groups Entering A Competition	Answer
293	Hard	Greedy	Maximum Score of a Good Subarray	Answer
294	Medium	Greedy	Minimum Add To Make Parentheses Valid	Answer
295	Medium	Greedy	Minimum Suffix Flips	Answer
296	Medium	Greedy	Minimum Time to Make Rope Colorful	Answer
297	Medium	Greedy	Non Overlapping Intervals	Answer
298	Medium	Greedy	Remove Colored Pieces if Both Neighbors are the Same Color	Answer
299	Medium	Greedy	Remove K Digits*	Answer
300	Medium	Greedy	Score After Flipping Matrix	Answer
301	Medium	Greedy	Split Array Into Consecutive Subsequences	Answer
302	Medium	Hash	Bulls And Cows	Answer
303	Medium	Hash	Contiguous Array - Equal 0s and 1s in BA	Answer
304	Medium	Hash	Count Nice Pairs in an Array	Answer
305	Medium	Hash	Custom Sort String	Answer
306	Medium	Hash	Find All Anagrams in a String	Answer
307	Easy	Hash	Find the Difference	Answer
308	Medium	Hash	Finding the Users Active Minutes	Answer
309	Medium	Hash	Group Anagrams	Answer
310	Easy	Hash	Intersection Of Two Arrays Ii	Answer
311	Easy	Hash	Intersection Of Two Arrays	Answer
312	Medium	Hash	Invalid Transactions	Answer
313	Easy	Hash	Largest Positive Integer That Exists With Its Negative	Answer
314	Medium	Hash	Longest Palindrome by Concatenating Two Letter Words	Answer
315	Medium	Hash	Majority Element Ii	Answer
316	Medium	Hash	Minimum Amount of Time to Collect Garbage	Answer
317	Medium	Hash	Minimum Consecutive Cards to Pick Up	Answer
318	Hard	Hash	Naming a Company	Answer
319	Medium	Hash	Number of Matching Subsequences	Answer
320	Medium	Hash	Replace Elements In An Array	Answer
321	Easy	Hash	Shortest Completing Word	Answer
322	Medium	Hash	Sort Characters By Frequency	Answer
323	Medium	Hash	Subarray Sum Equals K	Answer
324	Medium	Hash	Top K Frequent Words	Answer
325	Medium	Heap	Distant Barcodes	Answer
326	Medium	Heap	Divide Intervals Into Minimum Number of Groups	Answer
327	Medium	Heap	Find The Kth Largest Integer In The Array	Answer
328	Hard	Heap	Find the K-Sum of an Array	Answer
329	Hard	Heap	IPO	Answer
330	Medium	Heap	K Closest Points To Origin	Answer
331	Medium	Heap	Kth Largest Element In An Array	Answer
332	Easy	Heap	Last Stone Weight	Answer
333	Medium	Heap	Maximum Bags With Full Capacity of Rocks	Answer
334	Medium	Heap	Maximum Number of Coins You Can Get	Answer
335	Medium	Heap	Maximum Subsequence Score	Answer
336	Medium	Heap	Minimum Operations to Halve Array Sum	Answer
337	Medium	Heap	Most Profit Assigning Work	Answer
338	Medium	Heap	Number of Orders in the Backlog	Answer
339	Medium	Heap	Remove Stones to Minimize the Total	Answer
340	Medium	Heap	Reorganize String	Answer
341	Medium	Heap	Single-Threaded CPU	Answer
342	Hard	Heap	Sliding Window Maximum	Answer
343	Medium	Heap	Smallest Number in Infinite Set	Answer
344	Medium	Heap	Sort Characters By Frequency	Answer
345	Medium	Heap	Stock Price Fluctuation	Answer
346	Medium	Heap	Task Scheduler*	Answer
347	Medium	Heap	Top K Frequent Elements*	Answer
348	Medium	Intervals	Insert Interval	Answer
349	Medium	Intervals	Merge Intervals	Answer
350	Medium	Intervals	Non Overlapping Intervals	Answer
351	Medium	Intervals	Partition Labels	Answer
352	Hard	K-Way Merge	Smallest Range Covering Elements from K Lists	Answer
353	Medium	Knapsack DP	House Robber Ii	Answer
354	Medium	Knapsack DP	Ones and Zeroes	Answer
355	Medium	Knapsack DP	Shopping Offers	Answer
356	Medium	Knapsack DP	Target Sum	Answer
357	Medium	Linked List	Add Two Numbers	Answer
358	Medium	Linked List	Copy List With Random Pointer	Answer
359	Medium	Linked List	Delete Node without Head	Answer
360	Easy	Linked List	Intersection Of Two Linked Lists	Answer
361	Medium	Linked List	Linked List Cycle Ii	Answer
362	Medium	Linked List	Maximum Twin Sum of a Linked List	Answer
363	Hard	Linked List	Merge K Sorted Lists	Answer
364	Easy	Linked List	Merge Two Sorted Lists	Answer
365	Medium	Linked List	Odd Even Linked List	Answer
366	Easy	Linked List	Palindrome Linked List	Answer
367	Medium	Linked List	Partition List	Answer
368	Easy	Linked List	Remove Linked List Elements	Answer
369	Medium	Linked List	Remove Nth Node From End Of List	Answer
370	Medium	Linked List	Remove Zero Sum Consecutive Nodes from Linked List	Answer
371	Medium	Linked List	Reorder List	Answer
372	Medium	Linked List	Reverse Linked List Ii	Answer
373	Medium	Linked List	Rotate List	Answer
374	Medium	Linked List	Sort List	Answer
375	Medium	Linked List	Swap Nodes In Pairs	Answer
376	Medium	Linked List	Swapping Nodes in a Linked List	Answer
377	Medium	MD DP	01 Matrix	Answer
378	Medium	Math	Bulb Switcher	Answer
379	Easy	Math	Can Make Arithmetic Progression From Sequence	Answer
380	Easy	Math	Check If It Is a Straight Line	Answer
381	Medium	Math	Closest Prime Numbers in Range	Answer
382	Easy	Math	Count Odd Numbers in an Interval Range	Answer
383	Medium	Math	Factorial Trailing Zeroes	Answer
384	Medium	Math	Fraction to Recurring Decimal	Answer
385	Medium	Math	Generate Random Point in a Circle	Answer
386	Easy	Math	Greatest Common Divisor of Strings	Answer
387	Medium	Math	Integer Break	Answer
388	Medium	Math	Integer to Roman	Answer
389	Hard	Math	K-th Smallest in Lexicographical Order	Answer
390	Hard	Math	Max Points on a Line	Answer
391		Math	Medium	Answer
392	Medium	Math	Number of Boomerangs	Answer
393	Hard	Math	Number of Ways to Reorder Array to Get Same BST	Answer
394	Medium	Math	Number of Zero-Filled Subarrays	Answer
395	Hard	Math	Orderly Queue	Answer
396	Medium	Math	Reverse Integer	Answer
397	Medium	Math	Strictly Palindromic Number	Answer
398	Medium	Math	Sum of Square Numbers	Answer
399	Medium	Math	Valid Square	Answer
400	Medium	Monotonic Stack	132 Pattern**	Answer
401	Medium	Monotonic Stack	Car Fleet	Answer
402	Medium	Monotonic Stack	Daily Temperatures	Answer
403	Hard	Monotonic Stack	Largest Rectangle in Histogram	Answer
404	Easy	Monotonic Stack	Next Greater Element I	Answer
405	Medium	Monotonic Stack	Next Greater Element Ii	Answer
406	Medium	Monotonic Stack	Online Stock Span	Answer
407	Medium	Monotonic Stack	Remove Duplicate Letters*	Answer
408	Medium	Monotonic Stack	Remove Duplicate Letters	Answer
409	Medium	Monotonic Stack	Remove K Digits	Answer
410	Medium	Monotonic Stack	Shortest Unsorted Continuous Subarray	Answer
411	Medium	Monotonic Stack	Smallest Subsequence of Distinct Characters	Answer
412	Medium	Monotonic Stack	Sum Of Subarray Ranges**	Answer
413	Medium	Prefix Sum	Continuous Subarray Sum	Answer
414	Easy	Prefix Sum	Find Pivot Index	Answer
415	Medium	Prefix Sum	Largest subarray with 0 sum	Answer
416	Medium	Prefix Sum	Matrix Block Sum	Answer
417		Prefix Sum	Medium	Answer
418	Medium	Prefix Sum	Path Sum Iii	Answer
419	Medium	Prefix Sum	Random Pick with Weight	Answer
420	Medium	Prefix Sum	Shifting Letters II	Answer
421	Medium	Prefix Sum	Special Array II	Answer
422	Medium	Prefix Sum	Subarray Sums Divisible by K	Answer
423	Medium	Prefix Sum	Subarray with given XOR	Answer
424	Medium	Priority Queue	Find K Pairs with Smallest Sums	Answer
425	Medium	Priority Queue	Sort Characters By Frequency	Answer
426	Hard	Priority Queue	Swim in Rising Water	Answer
427	Easy	Problem Solving	Backspace String Compare	Answer
428	Easy	Problem Solving	Check If All As Appears Before All Bs	Answer
429	Easy	Problem Solving	Delete Columns To Make Sorted	Answer
430	Easy	Problem Solving	Detect Capital	Answer
431	Easy	Problem Solving	Find The Highest Altitude	Answer
432	Easy	Problem Solving	Find The K Beauty Of A Number	Answer
433	Easy	Problem Solving	Flipping An Image	Answer
434	Easy	Problem Solving	Number Of 1 Bits	Answer
435	Medium	QuickSelect	Kth Largest Element In An Array	Answer
436	Medium	Recursion	Generate Parentheses	Answer
437		Recursion	Hard	Answer
438	Medium	Recursion	Knight Probability in Chessboard	Answer
439	Medium	Sliding Window	Check If a String Contains All Binary Codes of Size K	Answer
440	Easy	Sliding Window	Delete Characters To Make Fancy String	Answer
441	Hard	Sliding Window	Distinct Echo Substrings	Answer
442	Medium	Sliding Window	Find All Anagrams In A String	Answer
443	Medium	Sliding Window	Find the Longest Semi-Repetitive Substring	Answer
444	Medium	Sliding Window	Fruit Into Baskets	Answer
445	Medium	Sliding Window	Longest Repeating Character Replacement	Answer
446	Medium	Sliding Window	Longest Substring With At Most K Distinct	Answer
447	Medium	Sliding Window	Max Consecutive Ones III	Answer
448	Medium	Sliding Window	Maximize the Confusion of an Exam	Answer
449	Medium	Sliding Window	Maximum Number of Occurrences of a Substring	Answer
450	Medium	Sliding Window	Maximum Number of Vowels in a Substring of Given Length	Answer
451	Medium	Sliding Window	Minimum Size Subarray Sum	Answer
452	Medium	Sliding Window	Number of Substrings Containing All Three Characters	Answer
453	Medium	Sliding Window	Permutation In String	Answer
454	Hard	Sliding Window	Sliding Window Median	Answer
455	Easy	Sliding Window	Substrings Of Size Three With Distinct Characters	Answer
456	Medium	Sorting	Find Players With Zero or One Losses	Answer
457	Medium	Sorting	H-Index	Answer
458	Medium	Sorting	K Closest Points To Origin	Answer
459	Medium	Sorting	Rank Teams by Votes	Answer
460	Medium	Sorting	Sort An Array	Answer
461	Medium	Stack	Asteroid Collision	Answer
462	Hard	Stack	Basic Calculator	Answer
463	Medium	Stack	Evaluate Reverse Polish Notation	Answer
464	Easy	Stack	Implement Stack using Queues	Answer
465	Medium	Stack	Removing Stars From a String	Answer
466	Medium	Stack	Simplify Path	Answer
467	Easy	Stack	Sort a Stack	Answer
468	Easy	Stack	Valid Parentheses	Answer
469	Medium	Strings	Count And Say	Answer
470	Hard	Strings	Design A Text Editor	Answer
471	Medium	Strings	Determine if Two Strings Are Close	Answer
472	Easy	Strings	First Unique Character In A String	Answer
473	Medium	Strings	Groups Of Special Equivalent Strings	Answer
474	Easy	Strings	Longest Palindrome	Answer
475	Medium	Strings	Longest Palindromic Substring	Answer
476	Medium	Strings	Longest Substring Without Repeating Characters	Answer
477	Medium	Strings	Minimum Number of Frogs Croaking	Answer
478	Medium	Strings	Palindromic Substrings	Answer
479	Medium	Strings	Reverse Words In A String	Answer
480	Easy	Strings	Reverse Words in a String III	Answer
481	Easy	Strings	Roman To Integer	Answer
482	Medium	Strings	String Compression	Answer
483	Medium	Strings	String to Integer (atoi)	Answer
484	Easy	Strings	Sum Of Digits Of String After Convert	Answer
485	Easy	Strings	Unique Email Addresses	Answer
486	Hard	Strings	Valid Number	Answer
487	Medium	Strings	Zigzag Conversion	Answer
488	Medium	Topological Sort	Course Schedule Ii	Answer
489	Medium	Topological Sort	Course Schedule	Answer
490	Medium	Topological Sort	Find All Possible Recipes From Given Supplies	Answer
491	Medium	Topological Sort	Find Eventual Safe States	Answer
492	Medium	Topological Sort	Minimum Height Trees	Answer
493	Medium	Trees	All Elements In Two Binary Search Trees	Answer
494	Easy	Trees	Balanced Binary Tree	Answer
495	Easy	Trees	Binary Tree Inorder Traversal	Answer
496	Hard	Trees	Binary Tree Maximum Path Sum	Answer
497	Easy	Trees	Binary Tree Postorder Traversal	Answer
498	Easy	Trees	Binary Tree Preorder Traversal	Answer
499	Medium	Trees	Binary Tree Pruning	Answer
500	Medium	Trees	Children Sum Property	Answer
501	Medium	Trees	Construct Binary Tree from Inorder and Postorder Traversal	Answer
502	Easy	Trees	Convert Sorted Array To Binary Search Tree	Answer
503	Medium	Trees	Count Complete Tree Nodes	Answer
504	Medium	Trees	Count Good Nodes in Binary Tree	Answer
505	Medium	Trees	Count Nodes Equal to Average of Subtree	Answer
506	Medium	Trees	Flatten Binary Tree To Linked List	Answer
507	Easy	Trees	Increasing Order Search Tree	Answer
508	Medium	Trees	Linked List In Binary Tree	Answer
509	Medium	Trees	Maximum Difference Between Node and Ancestor	Answer
510	Easy	Trees	Minimum Depth of Binary Tree	Answer
511	Medium	Trees	Most Profitable Path in a Tree	Answer
512	Medium	Trees	N-ary Tree Level Order Traversal	Answer
513	Medium	Trees	Recover Binary Search Tree	Answer
514	Medium	Trees	Step By Step Directions From A Binary Tree Node To Another	Answer
515	Medium	Trees	Two Sum IV - Input is a BST	Answer
516	Hard	Trees	Vertical Order Traversal of a Binary Tree	Answer
517	Medium	Trie	Design Add and Search Words Data Structure	Answer
518	Medium	Trie	Implement Trie (Prefix Tree)	Answer
519	Hard	Trie	Word Break II	Answer
520	Medium	Two Pointers	3Sum Closest	Answer
521	Medium	Two Pointers	3Sum	Answer
522	Medium	Two Pointers	4sum	Answer
523	Medium	Two Pointers	Container With Most Water	Answer
524	Medium	Two Pointers	Expressive Words	Answer
525	Medium	Two Pointers	Find the Duplicate Number	Answer
526	Medium	Two Pointers	Magical String	Answer
527	Hard	Two Pointers	Maximum Score Of A Good Subarray	Answer
528	Easy	Two Pointers	Merge Strings Alternately	Answer
529	Easy	Two Pointers	Move Zeroes	Answer
530	Medium	Two Pointers	Next Permutation	Answer
531	Medium	Two Pointers	Number of Subarrays with Bounded Maximum	Answer
532	Medium	Two Pointers	Partition Array According To Given Pivot	Answer
533	Medium	Two Pointers	Push Dominoes	Answer
534	Medium	Two Pointers	Rearrange Array Elements By Sign	Answer
535	Medium	Two Pointers	Remove Duplicates from Sorted Array II	Answer
536	Easy	Two Pointers	Remove Element	Answer
537	Easy	Two Pointers	Reverse Only Letters	Answer
538	Easy	Two Pointers	Reverse Vowels of a String	Answer
539	Medium	Two Pointers	Rotate Array	Answer
540	Easy	Two Pointers	Search Insert Position	Answer
541	Medium	Two Pointers	Sort Colors	Answer
542	Easy	Two Pointers	Squares Of A Sorted Array	Answer
543	Medium	Two Pointers	Subarray Product Less Than K	Answer
544	Medium	Two Pointers	Sum of Square Numbers	Answer
545	Easy	Two Pointers	Summary Ranges	Answer
546	Medium	Two Pointers	Swap Adjacent in LR String	Answer
547	Medium	Two Pointers	Two Sum Ii Input Array Is Sorted	Answer
548	Easy	Two Pointers	Two Sum	Answer
549	Hard	Union Find	Checking Existence of Edge Length Limited Paths	Answer
550	Medium	Union Find	Redundant Connection	Answer
551	Hard	Union Find	Remove Max Number of Edges to Keep Graph Fully Traversable	Answer
552	Medium	Union Find	Validate Binary Tree Nodes	Answer

AlgoExpert.io

Q No.	Difficulty	Category	Question	Solution
01	Easy	Arrays	Two Number Sum	Answer
02	Easy	Arrays	Validate Subsequence	Answer
03	Easy	Arrays	Sorted Squared Array	Answer
04	Easy	Arrays	Tournament Winner	Answer
05	Easy	Arrays	Non Constructible Change	Answer
06	Easy	Strings	Palindrome Check	Answer
07	Easy	Strings	Caesar Cipher Encryptor	Answer
08	Easy	Strings	Run Length Encoding	Answer
09	Easy	Strings	Generate Document	Answer
10	Easy	Strings	First Non Repeating Character	Answer
11	Easy	Linked Lists	Remove Duplicates From Linked List	Answer
12	Easy	Sorting	Bubble Sort	Answer
13	Easy	Sorting	Insertion Sort	Answer
14	Easy	Sorting	Selection Sort	Answer
15	Easy	Searching	Binary Search	Answer
16	Easy	Searching	Find Three Largest Numbers	Answer
17	Easy	Recursion	Nth Fibonacci	Answer
18	Easy	Recursion	Product Sum	Answer
19	Easy	Binary Trees	Branch Sums	Answer
20	Easy	Binary Trees	Node Depths	Answer
21	Easy	Binary Search Trees	Find Closest Value In BST	Answer
22	Easy	Greedy Algorithms	Class Photos	Answer
23	Easy	Greedy Algorithms	Tandem Bicycle	Answer
24	Easy	Greedy Algorithms	Minimum Waiting Time	Answer
25	Easy	Graphs	Depth first Search	Answer
26	Medium	Arrays	Three Number Sum	Answer
27	Medium	Arrays	Move Element To End	Answer
28	Medium	Arrays	Smallest Difference	Answer
29	Medium	Arrays	Monotonic Array	Answer
30	Medium	Arrays	Spiral Traverse	Answer
31	Medium	Arrays	Longest Peak	Answer
32	Medium	Arrays	Array Of Products	Answer
33	Medium	Arrays	First Duplicate Value	Answer
34	Medium	Strings	Longest Palindromic Substring	Answer
35	Medium	Strings	Group Anagrams	Answer
36	Medium	Strings	Minimum Characters For Words	Answer
37	Medium	Strings	Reverse Words In String	Answer
38	Medium	Strings	Valid IP Addresses	Answer
39	Medium	Linked Lists	Linked List Construction	Answer
40	Medium	Linked Lists	Remove Kth Node From End	Answer
41	Medium	Linked Lists	Sum of Linked Lists	Answer
42	Medium	Sorting	Three Number Sort	Answer
43	Medium	Sorting	Search In Sorted Matrix	Answer
44	Medium	Recursion	Permutations	Answer
45	Medium	Recursion	Powerset	Answer
46	Medium	Recursion	Phone Number Mnemonics	Answer
47	Medium	Binary Trees	Invert Binary Tree	Answer
48	Medium	Binary Trees	Binary Tree Diameter	Answer
49	Medium	Binary Trees	Find Successor	Answer
50	Medium	Binary Trees	Height Balanced Binary Tree	Answer
51	Medium	Binary Search Trees	BST Construction	Answer
52	Medium	Famous Algorithms	Kadane's Algorithm	Answer
53	Medium	Arrays	Merge Overlapping Intervals	Answer
54	Medium	Stacks	Next Greater Element	Answer
55	Medium	Stacks	Sort Stack	Answer
56	Medium	Binary Search Trees	Validate BST	Answer
57	Medium	Binary Search Trees	BST Traversal	Answer
58	Medium	Binary Search Trees	Min Height BST	Answer
59	Medium	Stack	Min Max Stack Construction	Answer
60	Medium	Stacks	Balanced Brackets	Answer
61	Medium	Stacks	Sunset Views	Answer
62	Medium	Dynamic Programming	Max Subset Sum No Adjacent	Answer
63	Medium	Dynamic Programming	Number Of Ways To Make Change	Answer
64	Medium	Dynamic Programming	Min Number Of Coins For Change	Answer
65	Medium	Dynamic Programming	Levenshtein Distance	Answer
66	Medium	Heaps	Min Heap Construction	Answer
67	Medium	Greedy Algorithms	Valid Starting City	Answer
68	Medium	Greedy Algorithms	Task Assignment	Answer
69	Medium	Binary Search Trees	Find Kth Largest Value In BST	Answer
70	Medium	Binary Search Trees	Reconstruct BST	Answer
71	Medium	Graphs	Single Cycle Check	Answer
72	Medium	Dynamic Programming	Number Of Ways To Traverse Graph	Answer
73	Medium	Recursion	Staircase Traversal	Answer
74	Medium	Graphs	Breadth First Search	Answer
75	Medium	Graphs	River Sizes	Answer
76	Medium	Graphs	Youngest Common Ancestor	Answer
77	Medium	Graphs	Remove Islands	Answer
78	Medium	Graphs	Cycle In Graph	Answer
79	Medium	Graphs	Minimum Passes Of Matrix	Answer
80	Medium	Tries	Suffix Trie Construction	Answer

6 Companies 30 Days Challenge

Q No.	Difficulty	Company	Question	My Solution
01	Medium	Microsoft	Shortest Unsorted Continuous Subarray	Answer
02	Medium	Microsoft	Course Schedule	Answer
03	Medium	Microsoft	Number of Substrings Containing All Three Characters	Answer
04	Medium	Microsoft	Most Profitable Path in a Tree	Answer
05	Medium	Microsoft	Largest Divisible Subset	Answer
06	Medium	Microsoft	Combination Sum III	Answer
07	Hard	Microsoft	Number of Pairs Satisfying Inequality	Answer
08	Medium	Microsoft	Bulls and Cows	Answer
09	Medium	Microsoft	Airplane Seat Assignment Probability	Answer
10	Hard	Microsoft	Longest Happy Prefix	Answer
11	Medium	Microsoft	Rotate Function	Answer
12	Hard	Microsoft	Minimum Deletions to Make Array Divisible	Answer
13	Hard	Microsoft	Perfect Rectangle	Answer
14	Medium	Microsoft	Number of Ways to Arrive at Destination	Answer
15	Medium	Microsoft	Evaluate Reverse Polish Notation	Answer
16	Medium	Goldman Sachs	Split Array into Consecutive Subsequences	Answer
17	Medium	Goldman Sachs	All Elements in Two Binary Search Trees	Answer
18	Medium	Goldman Sachs	Maximum Points in an Archery Competition	Answer
19	Medium	Goldman Sachs	Number of Boomerangs	Answer
20	Medium	Goldman Sachs	Get Biggest Three Rhombus Sums in a Grid	Answer
21	Hard	Goldman Sachs	Count Good Triplets in an Array	Answer
22	Medium	Goldman Sachs	Count Nice Pairs in an Array	Answer
23	Medium	Goldman Sachs	Number of People Aware of a Secret	Answer
24	Medium	Goldman Sachs	Invalid Transactions	Answer
25	Medium	Goldman Sachs	Valid Square	Answer
26	Hard	Goldman Sachs	Max Points on a Line	Answer
27	Hard	Goldman Sachs	IPO	Answer
28	Medium	Goldman Sachs	Factorial Trailing Zeroes	Answer
29	Hard	Goldman Sachs	Maximum Good People Based on Statements	Answer
30	Medium	Goldman Sachs	Minimum Consecutive Cards to Pick Up	Answer
31	Medium	Adobe	Fraction to Recurring Decimal	Answer
32	Medium	Adobe	Stock Price Fluctuation	Answer
33	Hard	Adobe	K-th Smallest in Lexicographical Order	Answer
34	Medium	Adobe	Shortest Unsorted Continuous Subarray	Answer
35	Medium	Adobe	Increasing Triplet Subsequence	Answer
36	Medium	Adobe	Count Nodes Equal to Average of Subtree	Answer
37	Medium	Adobe	Number of People Aware of a Secret	Answer
38	Medium	Adobe	Maximum Matrix Sum	Answer
39	Hard	Adobe	Dungeon Game	Answer
40	Medium	Adobe	Magical String	Answer
41	Hard	Adobe	Non-negative Integers without Consecutive Ones	Answer
42	Medium	Adobe	Knight Probability in Chessboard	Answer
43	Medium	Adobe	Number of Matching Subsequences	Answer
44	Medium	Adobe	Minimum Genetic Mutation	Answer
45	Medium	Adobe	Query Kth Smallest Trimmed Number	Answer
46	Medium	Flipkart	Custom Sort String	Answer
47	Medium	Flipkart	Max Area of Island	Answer
48	Medium	Flipkart	Distant Barcodes	Answer
49	Medium	Flipkart	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Answer
50	Hard	Flipkart	Find in Mountain Array	Answer
51	Medium	Flipkart	Find the Winner of the Circular Game	Answer
52	Hard	Flipkart	Number of Ways to Separate Numbers	Answer
53	Medium	Flipkart	Closest Prime Numbers in Range	Answer
54	Medium	Flipkart	Top K Frequent Words	Answer
55	Medium	Flipkart	House Robber III	Answer
56	Medium	Flipkart	Partition to K Equal Sum Subsets	Answer
57	Medium	Flipkart	Check If a String Contains All Binary Codes of Size K	Answer
58	Medium	Flipkart	New 21 Game	Answer
59	Medium	Flipkart	Shopping Offers	Answer
60	Medium	Flipkart	Remove Zero Sum Consecutive Nodes from Linked List	Answer
61	Medium	Google	Network Delay Time	Answer
62	Medium	Google	Number of Closed Islands	Answer
63	Medium	Google	Maximum Compatibility Score Sum	Answer
64	Medium	Google	Strictly Palindromic Number	Answer
65	Hard	Google	Maximum Good People Based on Statements	Answer
66	Medium	Google	Restore IP Addresses	Answer
67	Medium	Google	Maximum Consecutive Floors Without Special Floors	Answer
68	Medium	Google	Maximum Number of Coins You Can Get	Answer
69	Medium	Google	K Divisible Elements Subarrays	Answer
70	Medium	Google	Matrix Block Sum	Answer
71	Hard	Google	Distinct Echo Substrings	Answer
72	Medium	Google	Fruit Into Baskets	Answer
73	Medium	Google	Sort an Array	Answer
74	Hard	Google	Swim in Rising Water	Answer
75	Medium	Google	Random Pick with Weight	Answer
76	Medium	Amazon	Last Moment Before All Ants Fall Out of a Plank	Answer
77	Medium	Amazon	Split a String Into the Max Number of Unique Substrings	Answer
78	Medium	Amazon	Shuffle an Array	Answer
79	Medium	Amazon	Tweet Counts Per Frequency	Answer
80	Medium	Amazon	Maximum Length of Repeated Subarray	Answer
81	Medium	Amazon	Destroying Asteroids	Answer
82	Medium	Amazon	Maximum Sum of an Hourglass	Answer
83	Medium	Amazon	Top K Frequent Words	Answer
84	Medium	Amazon	Generate Random Point in a Circle	Answer
85	Medium	Amazon	Number of Matching Subsequences	Answer
86	Medium	Amazon	Maximum Subarray Min-Product	Answer
87	Medium	Amazon	Dota2 Senate	Answer
88	Medium	Amazon	Number of Ways to Reach a Position After Exactly k Steps	Answer
89	Medium	Amazon	Most Popular Video Creator	Answer
90	Medium	Amazon	Cheapest Flights Within K Stops	Answer

HackerRank Interview Preparation Pack

Q No.	Week	Question	Solution
01	WEEK-01	Sparse Arrays	Answer.py
02	WEEK-01	Camel Case	Answer.py
03	WEEK-01	Mini-Max Sum	Answer.py
04	WEEK-01	Breaking the Records	Answer.py
05	WEEK-01	Divisible Sum Pairs	Answer.py
06	WEEK-01	Time Conversion	Answer.py
07	WEEK-01	Plus Minus	Answer.py
08	WEEK-02	Mars Exploration	Answer.py
09	WEEK-02	Pangrams	Answer.py
10	WEEK-02	Flipping bits	Answer.py
11	WEEK-02	Diagonal Difference	Answer.py
12	WEEK-02	Counting Valleys	Answer.py
13	WEEK-02	Grading Students	Answer.py
14	WEEK-02	Counting Sort	Answer.py
15	WEEK-03	Drawing Book	Answer.py
16	WEEK-03	Zig Zag Sequence	Answer.py
17	WEEK-03	Migratory Birds	Answer.py
18	WEEK-03	Permuting Two Arrays	Answer.py
19	WEEK-03	Sales by Match	Answer.py
20	WEEK-03	Subarray Division 2	Answer.py
21	WEEK-03	XOR Strings 3	Answer.py
22	WEEK-03	Maximum Perimeter Triangle	Answer.py
23	WEEK-04	Left Rotation	Answer.py
24	WEEK-04	Caesar Cipher	Answer.py
25	WEEK-04	Closest Numbers	Answer.py
26	WEEK-04	Number Line Jumps	Answer.py
27	WEEK-04	Picking Numbers	Answer.py
28	WEEK-04	Separate the Numbers	Answer.py
29	WEEK-04	Tower Breakers	Answer.py
30	WEEK-04	Minimum Absolute Difference in an Array	Answer.py
31	WEEK-05	Max Min	Answer.py
32	WEEK-05	Dynamic Array	Answer.py
33	WEEK-05	Strong Password	Answer.py
34	WEEK-05	Smart Number 2	Answer.py
35	WEEK-05	Missing Numbers	Answer.py
36	WEEK-05	Grid Challenge	Answer.py
37	WEEK-05	Sansa and XOR	Answer.py
38	WEEK-05	The Full Counting Sort	Answer.py
39	WEEK-06	Recursive Digit Sum	Answer.py
40	WEEK-06	Counter game	Answer.py
41	WEEK-06	Gaming Array 1	Answer.py
42	WEEK-06	Sherlock and Array	Answer.py
43	WEEK-07	New Year Chaos	Answer.py
44	WEEK-07	The Bomberman Game	Answer.py
45	WEEK-07	Reverse a doubly linked list	Answer.py
46	WEEK-07	Climbing the Leaderboard	Answer.py
47	WEEK-07	Insert a node at a specific position in a linked list	Answer.py
48	WEEK-07	Goodland Electricity	Answer.py
49	WEEK-07	Sherlock and the Valid String	Answer.py
50	WEEK-07	Reverse a linked list	Answer.py
51	WEEK-08	Inserting a Node Into a Sorted Doubly Linked List	Answer.py
52	WEEK-08	Balanced Brackets	Answer.py
53	WEEK-08	Merge two sorted linked lists	Answer.py
54	WEEK-08	Super Reduced String	Answer.py
55	WEEK-08	Cycle Detection	Answer.py
56	WEEK-08	Sherlock and Anagrams	Answer.py
57	WEEK-08	Queue using Two Stacks	Answer.py
58	WEEK-08	Ice Cream Parlor	Answer.py
59	WEEK-09	Equal Stacks	Answer.py
60	WEEK-09	Simple Text Editor	Answer.py
61	WEEK-09	Chief Hopper	Answer.py
62	WEEK-09	Stock Maximize	Answer.py
63	WEEK-09	The Maximum Subarray	Answer.py
64	WEEK-09	Waiter	Answer.py
65	WEEK-09	Two Characters	Answer.py
66	WEEK-09	The Coin Change Problem	Answer.py
67	WEEK-10	Weighted Uniform Strings	Answer.py
68	WEEK-10	QHEAP1	Answer.py
69	WEEK-10	Permutation game	Answer.py
70	WEEK-10	Lego Blocks	Answer.py