Data Structure

Len Chen

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2 min read

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Feb 4, 2020

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Questions

basic

• 28. Implement strStr()
• 443. String Compression
• 186. Reverse Words in a String II
• 205. Isomorphic Strings
• 293. Flip Game
• 294. Flip Game II
• 290. Word Pattern
• 242. Valid Anagram
• 49. Group Anagrams
• 249. Group Shifted Strings
• 438. Find All Anagrams in a String
• 161. One Edit Distance
• 38. Count and Say
• 316. Remove Duplicate Letters
• 844. Backspace String Compare
• 271. Encode and Decode Strings
• 168. Excel Sheet Column Title
• 171. Excel Sheet Column Number
• 13. Roman to Integer
• 12. Integer to Roman
• 273. Integer to English Words
• 68. Text Justification
• 65. Valid Number
• 157. Read N Characters Given Read4
• 158. Read N Characters Given Read4 II — Call multiple times
• 556. Next Greater Element III
• 1653. Minimum Deletions to Make String Balanced
• 1737. Change Minimum Characters to Satisfy One of Three Conditions
• 1055. Shortest Way to Form String
• 115. Distinct Subsequences
• 880. Decoded String at Index
• 1717. Maximum Score From Removing Substrings

substring

• 76. Minimum Window Substring
• 3. Longest Substring Without Repeating Characters
• 395. Longest Substring with At Least K Repeating Characters
• 340. Longest Substring with At Most K Distinct Characters
• 459. Repeated Substring Pattern
• 1397. Find All Good Strings
• 1371. Find the Longest Substring Containing Vowels in Even Counts
• 1638. Count Substrings That Differ by One Character

palindrome

• 125. Valid Palindrome
• 680. Valid Palindrome II
• 5. Longest Palindromic Substring
• 214. Shortest Palindrome
• 336. Palindrome Pairs

parentheses

• 20. Valid Parentheses
• 678. Valid Parenthesis String
• 22. Generate Parentheses
• 32. Longest Valid Parentheses
• 241. Different Ways to Add Parentheses
• 301. Remove Invalid Parentheses

Solutions

basic

• 28. Implement strStr()

• 443. String Compression

• 186. Reverse Words in a String II

• 205. Isomorphic Strings

• 293. Flip Game

• 294. Flip Game II

• 290. Word Pattern

• 242. Valid Anagram

• 49. Group Anagrams

• 438. Find All Anagrams in a String

• 249. Group Shifted Strings

• 161. One Edit Distance

• 38. Count and Say

• 316. Remove Duplicate Letters

• 844. Backspace String Compare

• 271. Encode and Decode Strings

• 168. Excel Sheet Column Title

• 171. Excel Sheet Column Number

• 13. Roman to Integer

• 12. Integer to Roman

• 273. Integer to English Words

• 68. Text Justification

• 65. Valid Number

• 157. Read N Characters Given Read4

• 158. Read N Characters Given Read4 II — Call multiple times

• 556. Next Greater Element III

• 1653. Minimum Deletions to Make String Balanced

• 1737. Change Minimum Characters to Satisfy One of Three Conditions

• 1055. Shortest Way to Form String

• 115. Distinct Subsequences

• 880. Decoded String at Index

• 1717. Maximum Score From Removing Substrings

substring

• 76. Minimum Window Substring

• 3. Longest Substring Without Repeating Characters

• 395. Longest Substring with At Least K Repeating Characters

• 340. Longest Substring with At Most K Distinct Characters

• 459. Repeated Substring Pattern

• 1397. Find All Good Strings

• 1371. Find the Longest Substring Containing Vowels in Even Counts

• 1638. Count Substrings That Differ by One Character

palindrome

• 125. Valid Palindrome

• 680. Valid Palindrome II

• 5. Longest Palindromic Substring

• 214. Shortest Palindrome

• 336. Palindrome Pairs

parentheses

• 20. Valid Parentheses

• 678. Valid Parenthesis String

• 22. Generate Parentheses

• 32. Longest Valid Parentheses

• 241. Different Ways to Add Parentheses

• 301. Remove Invalid Parentheses