String in Python with Tests

String holds 380 problems (100 Easy, 201 Medium, 79 Hard). Generate any of them into the current directory with lcpy gen -n <number>.

#	Problem	Difficulty	Solution
3	Longest Substring Without Repeating Characters	Medium	solution.py
5	Longest Palindromic Substring	Medium	solution.py
6	Zigzag Conversion	Medium	solution.py
8	String to Integer (atoi)	Medium	solution.py
10	Regular Expression Matching	Hard	solution.py
12	Integer to Roman	Medium	solution.py
13	Roman to Integer	Easy	solution.py
14	Longest Common Prefix	Easy	solution.py
17	Letter Combinations of a Phone Number	Medium	solution.py
20	Valid Parentheses	Easy	solution.py
22	Generate Parentheses	Medium	solution.py
28	Find the Index of the First Occurrence in a String	Easy	solution.py
30	Substring with Concatenation of All Words	Hard	solution.py
32	Longest Valid Parentheses	Hard	solution.py
38	Count and Say	Medium	solution.py
43	Multiply Strings	Medium	solution.py
44	Wildcard Matching	Hard	solution.py
49	Group Anagrams	Medium	solution.py
58	Length of Last Word	Easy	solution.py
65	Valid Number	Hard	solution.py
67	Add Binary	Easy	solution.py
68	Text Justification	Hard	solution.py
71	Simplify Path	Medium	solution.py
72	Edit Distance	Hard	solution.py
76	Minimum Window Substring	Hard	solution.py
79	Word Search	Medium	solution.py
87	Scramble String	Hard	solution.py
91	Decode Ways	Medium	solution.py
93	Restore IP Addresses	Medium	solution.py
97	Interleaving String	Medium	solution.py
115	Distinct Subsequences	Hard	solution.py
125	Valid Palindrome	Easy	solution.py
126	Word Ladder II	Hard	solution.py
127	Word Ladder	Hard	solution.py
131	Palindrome Partitioning	Medium	solution.py
132	Palindrome Partitioning II	Hard	solution.py
139	Word Break	Medium	solution.py
140	Word Break II	Hard	solution.py
151	Reverse Words in a String	Medium	solution.py
159	Longest Substring with At Most Two Distinct Characters	Medium	solution.py
161	One Edit Distance	Medium	solution.py
165	Compare Version Numbers	Medium	solution.py
166	Fraction to Recurring Decimal	Medium	solution.py
168	Excel Sheet Column Title	Easy	solution.py
171	Excel Sheet Column Number	Easy	solution.py
179	Largest Number	Medium	solution.py
186	Reverse Words in a String II	Medium	solution.py
187	Repeated DNA Sequences	Medium	solution.py
205	Isomorphic Strings	Easy	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
214	Shortest Palindrome	Hard	solution.py
224	Basic Calculator	Hard	solution.py
227	Basic Calculator II	Medium	solution.py
241	Different Ways to Add Parentheses	Medium	solution.py
242	Valid Anagram	Easy	solution.py
243	Shortest Word Distance	Easy	solution.py
244	Shortest Word Distance II	Medium	solution.py
245	Shortest Word Distance III	Medium	solution.py
246	Strobogrammatic Number	Easy	solution.py
247	Strobogrammatic Number II	Medium	solution.py
248	Strobogrammatic Number III	Hard	solution.py
249	Group Shifted Strings	Medium	solution.py
257	Binary Tree Paths	Easy	solution.py
266	Palindrome Permutation	Easy	solution.py
267	Palindrome Permutation II	Medium	solution.py
269	Alien Dictionary	Hard	solution.py
271	Encode and Decode Strings	Medium	solution.py
273	Integer to English Words	Hard	solution.py
282	Expression Add Operators	Hard	solution.py
288	Unique Word Abbreviation	Medium	solution.py
290	Word Pattern	Easy	solution.py
291	Word Pattern II	Medium	solution.py
293	Flip Game	Easy	solution.py
297	Serialize and Deserialize Binary Tree	Hard	solution.py
299	Bulls and Cows	Medium	solution.py
301	Remove Invalid Parentheses	Hard	solution.py
306	Additive Number	Medium	solution.py
316	Remove Duplicate Letters	Medium	solution.py
318	Maximum Product of Word Lengths	Medium	solution.py
320	Generalized Abbreviation	Medium	solution.py
331	Verify Preorder Serialization of a Binary Tree	Medium	solution.py
332	Reconstruct Itinerary	Hard	solution.py
336	Palindrome Pairs	Hard	solution.py
340	Longest Substring with At Most K Distinct Characters	Medium	solution.py
344	Reverse String	Easy	solution.py
345	Reverse Vowels of a String	Easy	solution.py
358	Rearrange String k Distance Apart	Hard	solution.py
383	Ransom Note	Easy	solution.py
385	Mini Parser	Medium	solution.py
387	First Unique Character in a String	Easy	solution.py
388	Longest Absolute File Path	Medium	solution.py
389	Find the Difference	Easy	solution.py
392	Is Subsequence	Easy	solution.py
394	Decode String	Medium	solution.py
395	Longest Substring with At Least K Repeating Characters	Medium	solution.py
399	Evaluate Division	Medium	solution.py
402	Remove K Digits	Medium	solution.py
405	Convert a Number to Hexadecimal	Easy	solution.py
408	Valid Word Abbreviation	Easy	solution.py
409	Longest Palindrome	Easy	solution.py
411	Minimum Unique Word Abbreviation	Hard	solution.py
412	Fizz Buzz	Easy	solution.py
415	Add Strings	Easy	solution.py
418	Sentence Screen Fitting	Medium	solution.py
420	Strong Password Checker	Hard	solution.py
423	Reconstruct Original Digits from English	Medium	solution.py
424	Longest Repeating Character Replacement	Medium	solution.py
425	Word Squares	Hard	solution.py
428	Serialize and Deserialize N-ary Tree	Hard	solution.py
433	Minimum Genetic Mutation	Medium	solution.py
434	Number of Segments in a String	Easy	solution.py
438	Find All Anagrams in a String	Medium	solution.py
439	Ternary Expression Parser	Medium	solution.py
443	String Compression	Medium	solution.py
449	Serialize and Deserialize BST	Medium	solution.py
451	Sort Characters By Frequency	Medium	solution.py
459	Repeated Substring Pattern	Easy	solution.py
466	Count The Repetitions	Hard	solution.py
467	Unique Substrings in Wraparound String	Medium	solution.py
468	Validate IP Address	Medium	solution.py
471	Encode String with Shortest Length	Hard	solution.py
472	Concatenated Words	Hard	solution.py
474	Ones and Zeroes	Medium	solution.py
481	Magical String	Medium	solution.py
482	License Key Formatting	Easy	solution.py
484	Find Permutation	Medium	solution.py
488	Zuma Game	Hard	solution.py
499	The Maze III	Hard	solution.py
500	Keyboard Row	Easy	solution.py
504	Base 7	Easy	solution.py
514	Freedom Trail	Hard	solution.py
516	Longest Palindromic Subsequence	Medium	solution.py
520	Detect Capital	Easy	solution.py
521	Longest Uncommon Subsequence I	Easy	solution.py
522	Longest Uncommon Subsequence II	Medium	solution.py
524	Longest Word in Dictionary through Deleting	Medium	solution.py
527	Word Abbreviation	Hard	solution.py
535	Encode and Decode TinyURL	Medium	solution.py
536	Construct Binary Tree from String	Medium	solution.py
537	Complex Number Multiplication	Medium	solution.py
539	Minimum Time Difference	Medium	solution.py
541	Reverse String II	Easy	solution.py
544	Output Contest Matches	Medium	solution.py
551	Student Attendance Record I	Easy	solution.py
555	Split Concatenated Strings	Medium	solution.py
556	Next Greater Element III	Medium	solution.py
557	Reverse Words in a String III	Easy	solution.py
564	Find the Closest Palindrome	Hard	solution.py
567	Permutation in String	Medium	solution.py
583	Delete Operation for Two Strings	Medium	solution.py
588	Design In-Memory File System	Hard	solution.py
591	Tag Validator	Hard	solution.py
592	Fraction Addition and Subtraction	Medium	solution.py
599	Minimum Index Sum of Two Lists	Easy	solution.py
604	Design Compressed String Iterator	Easy	solution.py
606	Construct String from Binary Tree	Medium	solution.py
609	Find Duplicate File in System	Medium	solution.py
616	Add Bold Tag in String	Medium	solution.py
631	Design Excel Sum Formula	Hard	solution.py
635	Design Log Storage System	Medium	solution.py
639	Decode Ways II	Hard	solution.py
640	Solve the Equation	Medium	solution.py
642	Design Search Autocomplete System	Hard	solution.py
647	Palindromic Substrings	Medium	solution.py
648	Replace Words	Medium	solution.py
649	Dota2 Senate	Medium	solution.py
657	Robot Return to Origin	Easy	solution.py
664	Strange Printer	Hard	solution.py
676	Implement Magic Dictionary	Medium	solution.py
677	Map Sum Pairs	Medium	solution.py
678	Valid Parenthesis String	Medium	solution.py
680	Valid Palindrome II	Easy	solution.py
681	Next Closest Time	Medium	solution.py
686	Repeated String Match	Medium	solution.py
691	Stickers to Spell Word	Hard	solution.py
692	Top K Frequent Words	Medium	solution.py
696	Count Binary Substrings	Easy	solution.py
709	To Lower Case	Easy	solution.py
712	Minimum ASCII Delete Sum for Two Strings	Medium	solution.py
720	Longest Word in Dictionary	Medium	solution.py
721	Accounts Merge	Medium	solution.py
722	Remove Comments	Medium	solution.py
726	Number of Atoms	Hard	solution.py
727	Minimum Window Subsequence	Hard	solution.py
730	Count Different Palindromic Subsequences	Hard	solution.py
734	Sentence Similarity	Easy	solution.py
736	Parse Lisp Expression	Hard	solution.py
737	Sentence Similarity II	Medium	solution.py
745	Prefix and Suffix Search	Hard	solution.py
748	Shortest Completing Word	Easy	solution.py
751	IP to CIDR	Medium	solution.py
752	Open the Lock	Medium	solution.py
753	Cracking the Safe	Hard	solution.py
756	Pyramid Transition Matrix	Medium	solution.py
758	Bold Words in String	Medium	solution.py
761	Special Binary String	Hard	solution.py
763	Partition Labels	Medium	solution.py
767	Reorganize String	Medium	solution.py

Pages: 1, 2

Welcome

Getting Started

Practice

CLI

Catalog

Contributing

Troubleshooting

String in Python with Tests