Blind 75 in Python with Tested Solutions

Blind 75 holds 75 problems (19 Easy, 49 Medium, 7 Hard). Blind 75 is the classic curated list that started pattern-based prep, covering everything from arrays and hashing to dynamic programming. Every problem generates a Python practice environment with a parametrized pytest suite and a tested reference solution. Generate the whole collection into the current directory:

lcpy gen -t blind-75

#	Problem	Difficulty	Solution
1	Two Sum	Easy	solution.py
3	Longest Substring Without Repeating Characters	Medium	solution.py
5	Longest Palindromic Substring	Medium	solution.py
11	Container With Most Water	Medium	solution.py
15	3Sum	Medium	solution.py
19	Remove Nth Node From End of List	Medium	solution.py
20	Valid Parentheses	Easy	solution.py
21	Merge Two Sorted Lists	Easy	solution.py
23	Merge k Sorted Lists	Hard	solution.py
33	Search in Rotated Sorted Array	Medium	solution.py
39	Combination Sum	Medium	solution.py
48	Rotate Image	Medium	solution.py
49	Group Anagrams	Medium	solution.py
53	Maximum Subarray	Medium	solution.py
54	Spiral Matrix	Medium	solution.py
55	Jump Game	Medium	solution.py
56	Merge Intervals	Medium	solution.py
57	Insert Interval	Medium	solution.py
62	Unique Paths	Medium	solution.py
70	Climbing Stairs	Easy	solution.py
73	Set Matrix Zeroes	Medium	solution.py
76	Minimum Window Substring	Hard	solution.py
79	Word Search	Medium	solution.py
91	Decode Ways	Medium	solution.py
98	Validate Binary Search Tree	Medium	solution.py
100	Same Tree	Easy	solution.py
102	Binary Tree Level Order Traversal	Medium	solution.py
104	Maximum Depth of Binary Tree	Easy	solution.py
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	solution.py
121	Best Time to Buy and Sell Stock	Easy	solution.py
124	Binary Tree Maximum Path Sum	Hard	solution.py
125	Valid Palindrome	Easy	solution.py
128	Longest Consecutive Sequence	Medium	solution.py
133	Clone Graph	Medium	solution.py
139	Word Break	Medium	solution.py
141	Linked List Cycle	Easy	solution.py
143	Reorder List	Medium	solution.py
152	Maximum Product Subarray	Medium	solution.py
153	Find Minimum in Rotated Sorted Array	Medium	solution.py
190	Reverse Bits	Easy	solution.py
191	Number of 1 Bits	Easy	solution.py
198	House Robber	Medium	solution.py
200	Number of Islands	Medium	solution.py
206	Reverse Linked List	Easy	solution.py
207	Course Schedule	Medium	solution.py
208	Implement Trie (Prefix Tree)	Medium	solution.py
211	Design Add and Search Words Data Structure	Medium	solution.py
212	Word Search II	Hard	solution.py
213	House Robber II	Medium	solution.py
217	Contains Duplicate	Easy	solution.py
226	Invert Binary Tree	Easy	solution.py
230	Kth Smallest Element in a BST	Medium	solution.py
235	Lowest Common Ancestor of a Binary Search Tree	Medium	solution.py
238	Product of Array Except Self	Medium	solution.py
242	Valid Anagram	Easy	solution.py
252	Meeting Rooms	Easy	solution.py
253	Meeting Rooms II	Medium	solution.py
261	Graph Valid Tree	Medium	solution.py
268	Missing Number	Easy	solution.py
269	Alien Dictionary	Hard	solution.py
271	Encode and Decode Strings	Medium	solution.py
295	Find Median from Data Stream	Hard	solution.py
297	Serialize and Deserialize Binary Tree	Hard	solution.py
300	Longest Increasing Subsequence	Medium	solution.py
322	Coin Change	Medium	solution.py
323	Number of Connected Components in an Undirected Graph	Medium	solution.py
338	Counting Bits	Easy	solution.py
347	Top K Frequent Elements	Medium	solution.py
371	Sum of Two Integers	Medium	solution.py
417	Pacific Atlantic Water Flow	Medium	solution.py
424	Longest Repeating Character Replacement	Medium	solution.py
435	Non-overlapping Intervals	Medium	solution.py
572	Subtree of Another Tree	Easy	solution.py
647	Palindromic Substrings	Medium	solution.py
1143	Longest Common Subsequence	Medium	solution.py

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Blind 75 in Python with Tested Solutions