DSA questions

Assignment questions:

#	que	level	source
1	Marvolo Gaunt Ring	Medium	codeforces
2	Search a 2D Matrix	Medium	leetcode
3	Find Subsets	Medium	leetcode
4	Find Subsets (Use Bitmasking)	Medium	leetcode
5	Letter Combinations	Medium	leetcode
6	Fast Exponentiation	Medium	leetcode
7	Parantheses-1	Medium	leetcode
8	Parantheses-2	Medium	hackerrank
9	Simple Combinations	Medium	leetcode
10	Simple Combinations Sum	Medium	leetcode
11	Combination Sum	Medium	leetcode
12	Permutations-1	Easy	leetcode
13	Permutations-2 (Lexicographic ordering)	Easy	leetcode
14	Permutations-3	Medium	leetcode
15	Unique Paths	Hard	leetcode
16	Maze Problem	Hard	codechef
17	N-Queens 1	Hard	leetcode
18	N-Queens 2	Hard	leetcode
19	Sudoku Solver	Hard	leetcode
20	Peak Element	Medium	leetcode
21	K Closest Points	Easy	leetcode
22	Custom Sort	Medium	leetcode
23	Insertion Sort	Easy	geeksforgeeks
24	Bubble Sort	Easy	geeksforgeeks
25	Trouble Sort	Hard	uva
26	Special Election	Hard	codechef
27	Merge Process	Easy	leetcode
28	Sort the squares	Easy	leetcode
29	Special Inversions	Hard	leetcode
30	Counting Smaller Numbers	Hard	leetcode
31	Implement Partition	Easy	geeksforgeeks
32	Zeroes at the End	Easy	leetcode
33	Sorting Colors	Easy	leetcode
34	Linear Sort	Medium	geeksforgeeks
35	Unique Triplets	Medium	leetcode
36	Unique Quadruplets	Medium	leetcode
37	No Repetition	Medium	leetcode
38	Smallest Window	Hard	leetcode
39	Consecutive Ones	Medium	leetcode
40	Minimize the Expression(Try on Local Editor)	Medium	geeksforgeeks
41	Numbers with Prime Factors	Hard	leetcode
42	A Power of Two	Easy	leetcode
43	Count Set Bits	Easy	leetcode
44	Cumulative Bitwise AND	Medium	leetcode
45	Number occurring once-2	Medium	leetcode
46	Hamming Distance	Medium	leetcode
47	Sum of Bitwise OR	Hard	hackerrank
48	Multiple XOR queries	Medium	leetcode
49	Magic Formula	Medium	codeforces
50	Two Elements	Medium	leetcode
51	Infinite OR Game	Easy	codechef
52	Count Subarrays	Medium	leetcode
53	Interesting Queries	Medium	codeforces
54	Longest Consecutive Sequence	Hard	leetcode
55	Illumination	Hard	leetcode
56	Max Points	Hard	leetcode
57	All Words	Hard	leetcode
58	Make Palindromes	Hard	leetcode
59	Two Stacks	Easy	geeksforgeeks
60	Balanced Paranthesis	Easy	leetcode
61	Next Greater Element	Medium	geeksforgeeks
62	Largest Rectangle Histogram	Hard	leetcode
63	Need All Ones	Medium	hackerrank
64	Max Rectangle	Hard	leetcode
65	Sum of Minimums	Medium	leetcode
66	Duplicate Letters	Medium	leetcode
67	Design Min Stack	Medium	leetcode
68	Design Max Stack	Medium	hackerrank
69	Nested Integers	Medium	leetcode
70	Implement Queue	Easy	geeksforgeeks
71	Design Queue Using Stacks	Easy	leetcode
72	Design Stack Using Queues	Easy	leetcode
73	Reverse a Queue	Easy	geeksforgeeks
74	Binary Numbers	Easy	geeksforgeeks
75	Maximum in Sliding Window	Hard	leetcode
76	First Negative Integer	Hard	geeksforgeeks
77	Middle Node	Easy	leetcode
78	Delete N-th Node From End	Easy	leetcode
79	Reverse List iteratively	Easy	leetcode
80	Reverse List recursively	Easy	leetcode
81	Palindrome List	Easy	leetcode
82	Reordering	Medium	leetcode
83	K-Reversal	Hard	leetcode
84	Pair Sum in Linked List(Try on local IDE)	Medium	geeksforgeeks
85	Check For Cycle	Easy	leetcode
86	First Node of Cycle	Easy	leetcode
87	Merge Sorted Lists Iteratively	Easy	leetcode
88	Merge Sorted Lists Recursively	Easy	leetcode
89	K Sorted Lists	Easy	leetcode
90	Flatten a Linked List	Medium	geeksforgeeks
91	Clone a Linked List	Medium	leetcode
92	Segragate Nodes	Easy	geeksforgeeks
93	Multilevel Doubly Linked List	Medium	leetcode
94	Implement LRU Cache	Medium	leetcode
95	Count Leaf Nodes	Easy	geeksforgeeks
96	Left Leaves	Easy	leetcode
97	Mirror Image	Easy	geeksforgeeks
98	Symmetric Binary Tree	Easy	leetcode
99	Height of Binary Tree	Easy	leetcode
100	Minimum Height of Binary Tree	Easy	leetcode
101	Root to Leaf Paths	Easy	leetcode
102	Binary Tree Diameter	Medium	leetcode
103	Height Balanced Tree	Medium	leetcode
104	Maximum Sum Path	Hard	leetcode
105	Prune the Binary Tree	Easy	leetcode
106	Binary Tree to Doubly Linked List	Hard	geeksforgeeks
107	Binary Tree to Linked List	Medium	leetcode
108	Full Binary Trees	Medium	leetcode
109	Recursive Preorder Traversal	Easy	leetcode
110	Iterative Preorder Traversal	Medium	leetcode
111	Recursive Inorder Traversal	Easy	leetcode
112	Iterative Inorder Traversal	Medium	leetcode
113	Recursive Postorder Traversal	Easy	leetcode
114	Iterative Postorder Traversal	Medium	leetcode
115	Level Order Traversal	Easy	leetcode
116	ZigZag Level Order Traversal	Medium	leetcode
117	Left View of Tree	Medium	geeksforgeeks
118	Right View of Tree	Medium	geeksforgeeks
119	Next Pointers - 1	Medium	leetcode
120	Next Pointers - 2	Medium	leetcode
121	Vertical Order Traversal	Medium	geeksforgeeks
122	Top View of Tree	Medium	geeksforgeeks
123	Bottom View of Tree	Medium	geeksforgeeks
124	Count of Nodes in Complete Binary Tree	Medium	leetcode
125	Construct Binary Tree from Inorder and Preorder	Medium	leetcode
126	Construct Binary Tree from Inorder and Postorder	Medium	leetcode
127	Construct Binary Tree from Special Preorder(code on local IDE)	Medium	geeksforgeeks
128	Check for Subtree	Medium	leetcode
129	Duplicate Subtrees	Medium	leetcode
130	Binary Tree Serialization and Deserialization - 1	Medium	geeksforgeeks
131	Binary Tree Serialization and Deserialization - 2	Medium	leetcode
132	Binary Tree Recovery	Hard	leetcode
133	Max Product	Medium	leetcode
134	Lowest Common Ancestor	Medium	leetcode
135	Distance between Nodes	Medium	geeksforgeeks
136	SQL Practice - Hackerrank	Medium	hackerrank
137	SQL Practice - Leetcode	Medium	leetcode
138	Trie Implementation	Medium	leetcode
139	Trie Deletion	Medium	geeksforgeeks
140	Prefix Search	Medium	geeksforgeeks
141	Shortest Unique Prefix	Hard	geeksforgeeks
142	Maximum Xor in Array	Medium	leetcode
143	Minimum Xor in Array	Medium	geeksforgeeks
144	Maximum Xor Subarray	Medium	geeksforgeeks
145	Count Pairs with XOR in Range	Hard	leetcode
146	Search in BST	Easy	leetcode
147	Insert in BST	Easy	leetcode
148	Delete in BST	Medium	leetcode
149	k-th smallest in BST	Easy	leetcode
150	Validate BST	Medium	leetcode
151	Convert into BST	Easy	geeksforgeeks
152	Height Balanced BST	Easy	leetcode
153	Largest BST in Binary Tree	Hard	geeksforgeeks
154	Reconstruct BST from preorder	Medium	leetcode
155	Reconstruct BST from postorder	Medium	geeksforgeeks
156	Max Sum BST	Hard	leetcode
157	Implement BST Iterator	Medium	leetcode
158	Pair Sum in BST	Medium	geeksforgeeks
159	LCA in BST	Medium	leetcode
160	BST Recovery	Medium	leetcode
161	Build your Heap(on your local IDE)	Medium	geeksforgeeks
162	Heap Sort	Easy	geeksforgeeks
163	K-Largest	Easy	geeksforgeeks
164	K-Closest Points	Medium	leetcode
165	Tying Ropes	Medium	geeksforgeeks
166	Merge K Sorted Arrays	Medium	geeksforgeeks
167	Smallest Sum Pairs	Medium	leetcode
168	K-th Smallest in Special Matrix	Medium	leetcode
169	Schedule the tasks	Medium	leetcode
170	String rearrangement(Try on local IDE)	Hard	geeksforgeeks
171	Number with limited Prime Factors	Medium	leetcode
172	Number with limited Prime Factors - 2	Hard	leetcode
173	Maximum Meetings	Easy	geeksforgeeks
174	Minimum Platforms	Medium	hackerrank
175	Maximum Profit from Jobs	Medium	geeksforgeeks
176	Fractional Knapsack Problem	Medium	geeksforgeeks
177	Minimize the Loss(Try on Local IDE)	Medium	geeksforgeeks
178	K-th Largest in Running Stream	Medium	leetcode
179	Median in Running Stream	Hard	leetcode
180	Median in Sliding Window	Hard	leetcode
181	Maximum Performance	Hard	leetcode
182	Huffman Encoding	Hard	geeksforgeeks
183	BFS of Graph	Easy	geeksforgeeks
184	Shortest Path in Unweighted Graph	Medium	hackerrank
185	Knight Walk	Medium	geeksforgeeks
186	Nearest Zero	Medium	leetcode
187	Rotten Oranges	Medium	leetcode
188	Word Ladder	Hard	leetcode
189	DFS of Graph	Easy	geeksforgeeks
190	Connected Components	Medium	hackerearth
191	Number of Islands	Medium	leetcode
192	Capture Surrounded Regions	Medium	leetcode
193	Check Bipartite Graph	Medium	leetcode
194	Detect Cycle in Undirected Graph	Medium	geeksforgeeks
195	Detect Cycle in Directed Graph	Medium	geeksforgeeks
196	Topological Sort of Graph	Medium	geeksforgeeks
197	Course Schedule	Medium	leetcode
198	Staircase Problem - Top Bottom	Easy	geeksforgeeks
199	Staircase Problem - Bottom Top	Easy	geeksforgeeks
200	Tiling Problem	Easy	geeksforgeeks
201	Maximum non adjacent sum - Top Bottom	Medium	geeksforgeeks
202	Maximum non adjacent sum - Bottom Top	Medium	geeksforgeeks
203	Maximum non adjacent sum - 2	Medium	geeksforgeeks
204	Count of Decodings - Top Bottom	Medium	leetcode
205	Count of Decodings - Bottom Top	Medium	leetcode
206	Rod Cutting Problem - Top Bottom	Medium	geeksforgeeks
207	Rod Cutting Problem - Bottom Top	Medium	geeksforgeeks
208	Cutting Segments - Top Bottom	Medium	geeksforgeeks
209	Cutting Segments - Bottom Top	Medium	geeksforgeeks
210	Coin Change - 1 Top Bottom	Medium	leetcode
211	Coin Change - 1 Bottom Top	Medium	leetcode
212	Coin Change - 2 Top Bottom	Hard	geeksforgeeks
213	Coin Change - 2 Bottom Top	Hard	geeksforgeeks
214	Check Subset Sum	Medium	geeksforgeeks
215	Partition to minimise difference	Hard	geeksforgeeks
216	0-1 Knapsack Top Bottom	Medium	geeksforgeeks
217	0-1 Knapsack Bottom Top	Medium	geeksforgeeks
218	Unbounded Knapsack Top Bottom	Medium	geeksforgeeks
219	Unbounded Knapsack Bottom Top	Medium	geeksforgeeks
220	Longest Increasing Subsequence	Medium	leetcode
221	Longest Bitonic Subsequence	Medium	geeksforgeeks
222	Envelopes	Medium	leetcode
223	Stack the Boxes	Hard	geeksforgeeks
224	Count of LIS	Medium	leetcode
225	Longest Common Subsequence Top Bottom	Medium	leetcode
226	Longest Common Subsequence Bottom Top	Medium	leetcode
227	LCS Construction	Medium	hackerrank
228	Longest Palindromic Subsequence Top Bottom	Medium	leetcode
229	Longest Palindromic Subsequence Bottom Top	Medium	leetcode
230	Longest Palindromic Substring	Medium	leetcode
231	Split to Palindromes Top Bottom	Hard	leetcode
232	Split to Palindromes Bottom Top	Hard	leetcode
233	Edit Distance Top Bottom	Hard	leetcode
234	Edit Distance Bottom Top	Hard	leetcode
235	Pattern Matching Top Bottom	Hard	leetcode
236	Pattern Matching Bottom Top	Hard	leetcode
237	Regex Matching	Hard	leetcode
238	Count Subsequences	Hard	leetcode
239	Matrix Chain Multiplication Top Bottom	Hard	geeksforgeeks
240	Matrix Chain Multiplication Bottom Top	Hard	geeksforgeeks
241	Bursting Balloons Top Bottom	Hard	geeksforgeeks
242	Bursting Balloons Bottom Top	Hard	geeksforgeeks
243	Total Paths Top Bottom	Easy	leetcode
244	Total Paths Bottom Top	Easy	leetcode
245	Total Paths - 2 Top Bottom	Easy	leetcode
246	Total Paths - 2 Bottom Top	Easy	leetcode
247	Min Sum Path Top Bottom	Easy	leetcode
248	Min Sum Path Bottom Top	Easy	leetcode
249	AND plus OR	Easy	codechef
250	Cooking Machine	Easy	codechef
251	Integer Division Problem	Easy	codechef
252	Chef and Notebooks	Easy	codechef
253	Minimum Spanning Tree (Kruskal)	Hard	geeksforgeeks
254	Minimum Spanning Tree (Prim)	Hard	geeksforgeeks
255	Articulation Points	Hard	leetcode
256	Shortest Path in Graph using Dijkstra	Hard	leetcode
257	Lorenzo Von Matterhorn	Hard	codeforces
258	Diameter of Tree	Hard	codeforces
259	Kefa and Park	Hard	codeforces
260	Linova and Kingdom	Hard	codeforces
261	Range Minimum Query (Sparse Table)	Hard	spoj
262	Range Minimum Query (Sqrt Decomposition)	Hard	spoj

Homework questions:

#	que	level	source
1	Alyona and Flowers	Medium	codeforces
2	Star Sky	Hard	codeforces
3	Row with Maximum Ones	Medium	geeksforgeeks
4	LCM Challenge	Medium	codeforces
5	Sherlock and his girlfriend	Easy	codeforces
6	T-prime	Medium	codeforces
7	Colliders	Hard	codeforces
8	Coloured Field	Medium	codeforces
9	Sharks	Easy	codeforces
10	Enlarge GCD	Hard	codeforces
11	Manish and Choco	Medium	codeforces
12	The Pocket Book	Medium	codeforces
13	Transform A to B	Easy	codeforces
14	Recursive Digit Sum	Medium	hackerrank
15	Tower of Hanoi	Medium	geeksforgeeks
16	Number of Paths	Medium	geeksforgeeks
17	Pyramid of Glasses	Hard	codeforces
18	Restore IP Addresses	Medium	leetcode
19	Smallest Number	Medium	codeforces
20	Code for 1	Hard	codeforces
21	Subset Sums	Easy	geeksforgeeks
22	Sequential Digits	Medium	leetcode
23	Kth Lexicographical Happy String	Medium	leetcode
24	Letter Tile Possibilities	Medium	leetcode
25	Beautiful Arrangement	Medium	leetcode
26	Palindromic Partition	Medium	leetcode
27	Rat Maze Multiple Jumps	Medium	geeksforgeeks
28	Word Search	Medium	leetcode
29	Word Boggle	Medium	geeksforgeeks
30	8 Queens 3	Medium	uva
31	Verbal Arithmetic Puzzle	Hard	leetcode
32	24 Game	Hard	leetcode
33	First Bad Version	Easy	leetcode
34	Find in Mountain Array	Hard	leetcode
35	Hamburgers	Medium	codeforces
36	Sagheer and Nubian Market	Hard	codeforces
37	Magic Powder	Hard	codeforces
38	Monitor	Hard	codeforces
39	Sort Array by Frequency	Medium	geeksforgeeks
40	Qualifying Contest	Hard	codeforces
41	Advantage Shuffle	Medium	leetcode
42	Kefa and Company	Medium	codeforces
43	XK Segments	Hard	codeforces
44	To Add or Not To Add	Hard	codeforces
45	Largest Perimeter Triangle	Easy	leetcode
46	Ehab Is Odd Person	Easy	codeforces
47	Average Score	Hard	codeforces
48	Karen and Coffee	Medium	codeforces
49	Little Girl and Maximum Sum	Hard	codeforces
50	Greg and Array	Hard	codeforces
51	Yodaness	Hard	spoj
52	Kaos	Hard	spoj
53	Count of Range Sum	Hard	leetcode
54	Segregate Even and Odd Numbers	Easy	geeksforgeeks
55	Sort Arrays of 0, 1 and 2s	Medium	geeksforgeeks
56	Three Way Partitioning	Medium	geeksforgeeks
57	Efficiently sort 0 to n^2	Medium	geeksforgeeks
58	Intersection of 2 Sorted Arrays	Easy	leetcode
59	Remove Element in Place	Easy	leetcode
60	Remove Duplicates in Place	Medium	leetcode
61	Remove Duplicates in Place (Twice)	Medium	leetcode
62	Triplet Sum Closest	Medium	leetcode
63	Container with Most Water	Medium	leetcode
64	Boats to Save People	Medium	leetcode
65	Count Nice Subarrays	Medium	leetcode
66	Count Equivalent Subarrays	Medium	geeksforgeeks
67	Count Subarrays with K Different Integers	Hard	leetcode
68	Points on Line	Hard	codeforces
69	Lightsabers	Hard	codeforces
70	Steps to reduce to 1	Medium	leetcode
71	Flips to Make A OR B = C	Medium	leetcode
72	Gray Code	Hard	leetcode
73	Operations to Make 0	Hard	leetcode
74	Missing Point	Medium	codechef
75	Decoded XOR Permutations	Medium	leetcode
76	Triplets To Make Equal XOR	Medium	leetcode
77	Subarray Sum Div K	Medium	leetcode
78	Quadruple Sum	Medium	leetcode
79	Boxes Packing	Hard	codeforces
80	Contiguous Array	Medium	leetcode
81	Arthur and Table	Hard	codeforces
82	Thor	Hard	codeforces
83	Diagonal Traversal 1	Medium	leetcode
84	Diagonal Traversal 2	Medium	leetcode
85	Flip Columns Matrix	Medium	leetcode
86	Counting Triangles	Medium	codechef
87	Watchmen	Medium	codeforces
88	Vanya and Triangles	Hard	codeforces
89	Group Anagrams	Medium	leetcode
90	Repeated DNA Sequences	Medium	leetcode
91	Plug In	Easy	codeforces
92	Simplify Path	Medium	leetcode
93	Check Valid Substitutions	Medium	leetcode
94	Alternating Current	Medium	codeforces
95	132 Pattern	Medium	leetcode
96	Circular Next Greater Element	Medium	leetcode
97	Stock Span	Medium	geeksforgeeks
98	Mike and Feet	Hard	codeforces
99	Street Parade	Medium	spoj
100	Minimal String	Hard	codeforces
101	Stack with Increment	Medium	leetcode
102	Max Freq Stack	Hard	leetcode
103	Design Circular Queue	Medium	leetcode
104	Design Circular Deque	Medium	leetcode
105	Design Front Middle Back Queue	Medium	leetcode
106	Circular Tour	Easy	geeksforgeeks
107	Shortest Subarray with Sum Atleast K	Hard	leetcode
108	Longest Subarray Absolute Difference	Medium	leetcode
109	N/Kth Node in Linked List	Easy	geeksforgeeks
110	Merge in Between Linked Lists	Medium	leetcode
111	Reverse Linked List Part	Medium	leetcode
112	Rotate List	Medium	leetcode
113	Swap Pairs in Linked Lists	Medium	leetcode
114	Split Linked List into Parts	Medium	leetcode
115	Length of Cycle in Linked List	Medium	geeksforgeeks
116	Remove Cycle in Linked List	Medium	geeksforgeeks
117	Intersection in Y Shaped Linked List	Medium	geeksforgeeks
118	Insertion Sort in Linked List	Medium	leetcode
119	Quick Sort in Linked List	Medium	geeksforgeeks
120	Odd Even Linked List	Medium	leetcode
121	Add Numbers - 1	Medium	leetcode
122	Add Numbers - 2	Medium	leetcode
123	Subtract Numbers	Medium	geeksforgeeks
124	Remove Duplicates - 1	Easy	leetcode
125	Remove Duplicates - 2	Medium	leetcode
126	Next Greater Element in Linked List	Medium	leetcode
127	Front Middle Back Queue using DLL	Medium	leetcode
128	Quicksort on DLL	Medium	geeksforgeeks
129	Xored Doubly Linked List	Hard	geeksforgeeks
130	Same Tree	Easy	leetcode
131	Corresponding Node	Medium	leetcode
132	Count Good Nodes	Medium	leetcode
133	Even Valued Grandparent	Medium	leetcode
134	Deepest Leaves Sum	Medium	leetcode
135	Spiral Tree Height	Easy	geeksforgeeks
136	Foldable Tree	Easy	geeksforgeeks
137	Check Cousins	Easy	geeksforgeeks
138	Most Frequent Subtree Sum	Medium	leetcode
139	Expression Tree	Easy	geeksforgeeks
140	Ternary Expression to Tree	Easy	geeksforgeeks
141	Linked List in Binary Tree	Hard	leetcode
142	Distribute Coins	Hard	leetcode
143	Transform to Sum Tree	Easy	geeksforgeeks
144	Binary Tree to Circular DLL	Medium	geeksforgeeks
145	Remove Half Nodes	Medium	geeksforgeeks
146	Transform to Sum Tree	Easy	geeksforgeeks
147	Children Sum Parent	Easy	geeksforgeeks
148	Nodes at K Distance	Hard	leetcode
149	Flip Binary Tree to Match Traversal	Medium	leetcode
150	Max Width 1	Medium	geeksforgeeks
151	Max Width 2	Medium	leetcode
152	Bottom Up Level Order Traversal	Easy	leetcode
153	Largest Value in Each Level	Medium	leetcode
154	Add Row to Tree	Medium	leetcode
155	Vertical Sum of Tree	Easy	geeksforgeeks
156	Diagonal Traversal of Tree	Medium	geeksforgeeks
157	Boundary Traversal of Tree	Medium	geeksforgeeks
158	Make Binary Tree from Linked List	Medium	geeksforgeeks
159	Make Binary Tree from Parent Array	Medium	geeksforgeeks
160	Tree from Inorder and Level Order Traversals	Medium	geeksforgeeks
161	Tree from Preorder and Postorder Traversals	Medium	leetcode
162	Full Binary Tree from Preorder	Medium	geeksforgeeks
163	Binary Tree to Bracket Sequence	Medium	leetcode
164	Bracket Sequence to Binary Tree (IDE)	Medium	geeksforgeeks
165	Difference between Node and Ancestors	Medium	leetcode
166	Number of Turns in Binary Tree	Medium	geeksforgeeks
167	LCA of Deepest Leaves	Medium	leetcode
168	Path Sum 1	Medium	leetcode
169	Path Sum 2	Medium	leetcode
170	Path Sum 3	Medium	leetcode
171	Replace Words	Medium	leetcode
172	Phone Directory	Hard	geeksforgeeks
173	Map Sum Pairs	Medium	leetcode
174	X Xor Subarray	Hard	spoj
175	Maximum Subset XOR	Hard	hackerrank
176	Count nodes in Range	Medium	geeksforgeeks
177	Convert BST to Greater Tree	Medium	leetcode
178	Delete nodes > K	Easy	geeksforgeeks
179	Median of BST	Easy	geeksforgeeks
180	Pairs Violating BST Property	Hard	geeksforgeeks
181	Preorder Traversal to Postorder Traversal	Medium	geeksforgeeks
182	Serialise a BST	Medium	leetcode
183	Sorted LL to BST	Medium	leetcode
184	Count Pairs with Sum	Medium	geeksforgeeks
185	Intersection of 2 BST	Medium	geeksforgeeks
186	Union of 2 BST	Medium	leetcode
187	Inorder Predecessor and Successor	Medium	geeksforgeeks
188	Pth Common Ancestor	Medium	geeksforgeeks
189	Shortest Distance between 2 nodes (Try on IDE)	Medium	geeksforgeeks
190	Least Common Ancestor Multiple Nodes (Try on IDE)	Medium	geeksforgeeks
191	Shortest King Path	Easy	codeforces
192	Snakes and Ladders	Medium	geeksforgeeks
193	Shortest Prime Path	Medium	geeksforgeeks
194	Minimum Genetic Mutation	Medium	leetcode
195	Biridian Forest	Hard	codeforces
196	Farthest Land	Hard	leetcode
197	Word Ladder 2	Hard	leetcode
198	Largest Connected Component	Easy	spoj
199	Flood Fill Algorithm	Medium	geeksforgeeks
200	Flood Fill 3D	Medium	codeforces
201	Maze Validation	Medium	spoj
202	Trapping Rain Water 2D	Hard	leetcode
203	Minesweeper	Hard	leetcode
204	Evaluate Division	Hard	leetcode
205	Detect Cycle in Grid	Medium	leetcode
206	Course Schedule Check	Medium	leetcode
207	Two Dots	Hard	codeforces
208	Course Schedule Pair Check	Medium	leetcode
209	Sort Items by Dependencies	Hard	leetcode
210	Alien Dictionary	Hard	geeksforgeeks
211	Reach Given Score	Easy	geeksforgeeks
212	Minimum Cost to Climb Stairs	Easy	leetcode
213	Flower Array	Hard	codeforces
214	House Robber 2	Medium	leetcode
215	Boredom	Hard	codeforces
216	Vacation	Hard	codeforces
217	Decode Ways 2	Hard	leetcode
218	Best Team with No Conflicts	Medium	leetcode
219	Maximise Cut Segments	Medium	geeksforgeeks
220	Count Derangements (Try on IDE)	Hard	geeksforgeeks