DSA tracker

DSA solved0 of 157

Solved, Rev 1, Rev 2, Rev 3 and a confidence score (1–5) for each topic, as in the planner spreadsheet. A topic counts as complete once it is marked solved.

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DSA tracker
#	Topic	Category	Level
1	Contains Duplicate	Arrays	Easy
2	Valid Anagram	Hashing	Easy
3	Two Sum	Hashing	Easy
4	Group Anagrams	Hashing	Medium
5	Top K Frequent Elements	Hashing	Medium
6	Product of Array Except Self	Arrays	Medium
7	Valid Sudoku	Arrays	Medium
8	Encode and Decode Strings	Arrays	Medium
9	Longest Consecutive Sequence	Hashing	Medium
10	Maximum Subarray	Arrays	Medium
11	Merge Intervals	Arrays	Medium
12	Insert Interval	Arrays	Medium
13	Non-overlapping Intervals	Arrays	Medium
14	Rotate Image	Arrays	Medium
15	Spiral Matrix	Arrays	Medium
16	Set Matrix Zeroes	Arrays	Medium
17	Subarray Sum Equals K	Hashing	Medium
18	Majority Element	Arrays	Easy
19	Valid Palindrome	Two Pointers	Easy
20	Two Sum II Input Array Is Sorted	Two Pointers	Medium
21	3Sum	Two Pointers	Medium
22	Container With Most Water	Two Pointers	Medium
23	Trapping Rain Water	Two Pointers	Hard
24	Move Zeroes	Two Pointers	Easy
25	Sort Colors	Two Pointers	Medium
26	Best Time to Buy and Sell Stock	Sliding Window	Easy
27	Longest Substring Without Repeating Characters	Sliding Window	Medium
28	Longest Repeating Character Replacement	Sliding Window	Medium
29	Permutation in String	Sliding Window	Medium
30	Minimum Window Substring	Sliding Window	Hard
31	Sliding Window Maximum	Sliding Window	Hard
32	Maximum Average Subarray I	Sliding Window	Easy
33	Valid Parentheses	Stack	Easy
34	Min Stack	Stack	Medium
35	Evaluate Reverse Polish Notation	Stack	Medium
36	Generate Parentheses	Stack	Medium
37	Daily Temperatures	Stack	Medium
38	Car Fleet	Stack	Medium
39	Largest Rectangle in Histogram	Stack	Hard
40	Next Greater Element I	Stack	Easy
41	Implement Stack using Queues	Queue	Easy
42	Implement Queue using Stacks	Queue	Easy
43	Design Circular Queue	Queue	Medium
44	Number of Recent Calls	Queue	Easy
45	Binary Search	Binary Search	Easy
46	Search a 2D Matrix	Binary Search	Medium
47	Koko Eating Bananas	Binary Search	Medium
48	Find Minimum in Rotated Sorted Array	Binary Search	Medium
49	Search in Rotated Sorted Array	Binary Search	Medium
50	Time Based Key-Value Store	Binary Search	Medium
51	Median of Two Sorted Arrays	Binary Search	Hard
52	Find First and Last Position	Binary Search	Medium
53	Reverse Linked List	Linked List	Easy
54	Merge Two Sorted Lists	Linked List	Easy
55	Linked List Cycle	Linked List	Easy
56	Reorder List	Linked List	Medium
57	Remove Nth Node From End of List	Linked List	Medium
58	Copy List with Random Pointer	Linked List	Medium
59	Add Two Numbers	Linked List	Medium
60	Find the Duplicate Number	Linked List	Medium
61	LRU Cache	Linked List	Medium
62	Merge k Sorted Lists	Linked List	Hard
63	Reverse Nodes in k-Group	Linked List	Hard
64	Invert Binary Tree	Trees	Easy
65	Maximum Depth of Binary Tree	Trees	Easy
66	Diameter of Binary Tree	Trees	Easy
67	Balanced Binary Tree	Trees	Easy
68	Same Tree	Trees	Easy
69	Subtree of Another Tree	Trees	Easy
70	Binary Tree Level Order Traversal	Trees	Medium
71	Binary Tree Right Side View	Trees	Medium
72	Count Good Nodes in Binary Tree	Trees	Medium
73	Construct Tree from Preorder and Inorder	Trees	Medium
74	Binary Tree Maximum Path Sum	Trees	Hard
75	Serialize and Deserialize Binary Tree	Trees	Hard
76	Lowest Common Ancestor of Binary Tree	Trees	Medium
77	Validate Binary Search Tree	BST	Medium
78	Kth Smallest Element in a BST	BST	Medium
79	Lowest Common Ancestor of a BST	BST	Medium
80	Insert into a BST	BST	Medium
81	Delete Node in a BST	BST	Medium
82	Convert Sorted Array to BST	BST	Easy
83	Implement Trie (Prefix Tree)	Trees	Medium
84	Design Add and Search Words	Trees	Medium
85	Word Search II	Backtracking	Hard
86	Kth Largest Element in a Stream	Heap	Easy
87	Last Stone Weight	Heap	Easy
88	K Closest Points to Origin	Heap	Medium
89	Kth Largest Element in an Array	Heap	Medium
90	Task Scheduler	Heap	Medium
91	Design Twitter	Heap	Medium
92	Find Median from Data Stream	Heap	Hard
93	Subsets	Backtracking	Medium
94	Combination Sum	Backtracking	Medium
95	Permutations	Backtracking	Medium
96	Subsets II	Backtracking	Medium
97	Combination Sum II	Backtracking	Medium
98	Word Search	Backtracking	Medium
99	Palindrome Partitioning	Backtracking	Medium
100	Letter Combinations of a Phone Number	Backtracking	Medium
101	N-Queens	Backtracking	Hard
102	Number of Islands	Graph	Medium
103	Clone Graph	Graph	Medium
104	Max Area of Island	Graph	Medium
105	Pacific Atlantic Water Flow	Graph	Medium
106	Surrounded Regions	Graph	Medium
107	Rotting Oranges	Graph	Medium
108	Course Schedule	Graph	Medium
109	Course Schedule II	Graph	Medium
110	Graph Valid Tree	Graph	Medium
111	Number of Connected Components	Graph	Medium
112	Redundant Connection	Graph	Medium
113	Word Ladder	Graph	Hard
114	Network Delay Time	Graph	Medium
115	Cheapest Flights Within K Stops	Graph	Medium
116	Reconstruct Itinerary	Graph	Hard
117	Min Cost to Connect All Points	Graph	Medium
118	Swim in Rising Water	Graph	Hard
119	Alien Dictionary	Graph	Hard
120	Climbing Stairs	Dynamic Programming	Easy
121	Min Cost Climbing Stairs	Dynamic Programming	Easy
122	House Robber	Dynamic Programming	Medium
123	House Robber II	Dynamic Programming	Medium
124	Longest Palindromic Substring	Dynamic Programming	Medium
125	Palindromic Substrings	Dynamic Programming	Medium
126	Decode Ways	Dynamic Programming	Medium
127	Coin Change	Dynamic Programming	Medium
128	Maximum Product Subarray	Dynamic Programming	Medium
129	Word Break	Dynamic Programming	Medium
130	Longest Increasing Subsequence	Dynamic Programming	Medium
131	Partition Equal Subset Sum	Dynamic Programming	Medium
132	Unique Paths	Dynamic Programming	Medium
133	Longest Common Subsequence	Dynamic Programming	Medium
134	Best Time to Buy/Sell with Cooldown	Dynamic Programming	Medium
135	Coin Change II	Dynamic Programming	Medium
136	Target Sum	Dynamic Programming	Medium
137	Interleaving String	Dynamic Programming	Medium
138	Edit Distance	Dynamic Programming	Medium
139	Burst Balloons	Dynamic Programming	Hard
140	Regular Expression Matching	Dynamic Programming	Hard
141	Jump Game	Greedy	Medium
142	Jump Game II	Greedy	Medium
143	Gas Station	Greedy	Medium
144	Hand of Straights	Greedy	Medium
145	Merge Triplets to Form Target	Greedy	Medium
146	Partition Labels	Greedy	Medium
147	Valid Parenthesis String	Greedy	Medium
148	Longest Common Prefix	Strings	Easy
149	Reverse String	Strings	Easy
150	Valid Palindrome II	Strings	Easy
151	String to Integer (atoi)	Strings	Medium
152	Single Number	Hashing	Easy
153	Number of 1 Bits	Arrays	Easy
154	Counting Bits	Dynamic Programming	Easy
155	Reverse Bits	Arrays	Easy
156	Missing Number	Arrays	Easy
157	Sum of Two Integers	Arrays	Medium

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