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Strings

Char counting, palindromes, parsing, windows.

7 stops · 338 problems0/96 on the path done
next ▸ Count Segments in a StringSilver · 1000
1

Char counting & frequency

0/16 of 36you are here

Vowels, segments, frequencies.

○Count Segments in a String○Jewels and Stones○Count Vowels○Character Frequency○Maximum Word Frequency○Number of Good Pairs (Strings)○Number of Good Pairs in a String○Check if Sentence Is a Pangram○Check if Sentence Is Pangram○Count Vowels And Consonants○Count Segments○First Unique Character in a String○Count Consistent Strings○Most Common Character○Count Vowel Strings in Range○Count The Consistent Strings+20 in the arena
2

Palindromes

0/16 of 24

Detect, build, count, and expand palindromes.

○Check Palindrome○Palindrome Permutation○Longest Palindrome Buildable○Longest Palindrome Buildable Length○Minimum Changes to Palindrome○Count Palindromic Substrings Of Length Three○Break a Palindrome○Valid Palindrome II○Longest Palindrome Length○Longest Palindrome You Can Build○Find First Palindromic String○Valid Palindrome After One Removal○Count Palindrome Words○Palindrome Partition Count○Longest Palindromic Subsequence Length○Can Make Palindrome After Removals+8 in the arena
3

Anagrams & grouping

0/13

Anagram checks, grouping, ransom note.

○Ransom Note○Is Anagram○Word Pattern○Minimum Steps to Make Anagram○Minimum Steps to Anagram○Anagram Mappings○Group Anagrams○Remove Adjacent Anagrams○Find All Anagrams○Find All Anagrams In A String○Find All Anagram Indices○Anagram Groups Count○Count Anagrams of a Sentence
4

Parsing & formatting

0/16 of 39

atoi, roman, reverse words, compression.

○To Lower Case○Reverse String Array○Reverse String○Truncate Sentence○Reverse String In Place○Shuffle String○Capitalize Words○Title Case Sentence○To Lower Case (Manual)○Truncate Repeating Characters○Reverse Words in a String III○Run-Length Compression○String to Integer (atoi)○Validate License Plate○Complex Number Multiplication○Add Binary Strings+23 in the arena
5

Prefix & subsequence

0/13

Common prefix, subsequence checks.

○Longest Common Prefix○Is Subsequence○Longest Word By Deleting○Count Paren Subsequences○Length of Last Word○Longest Uncommon Subsequence I○Repeated Substring Pattern○Longest Common Subsequence Of Three○Distinct Subsequences○Distinct Subsequences Mod○Maximum Length of Concatenated Unique String○Distinct Subsequence Occurrences○Smallest Distinct Subsequence
6

Window on strings

0/6

Longest unique, min window, replacement.

○Minimum Deletions to Make Frequencies Unique○Deletions for Unique Frequencies○Substrings With K Distinct○Longest Substring Without Repeat○Longest Substring with K Distinct Characters○Longest Substring With K Distinct
7

More Strings

0/16 of 207

Everything else in this category — keep climbing.

○Reverse a String○Color of a Chessboard Square○Contains A, B, And C○Final Value of Variable After Performing Operations○Remove All Spaces○Count the Vowels○Count Words Equal to Target○Count Uppercase Letters○Find the Difference○Reformat Date○Defanging an IP Address○Find the Index of First Occurrence○Max Consecutive Characters○Check If All A's Appears Before All B's○Count Keyboard Row Words○Remove Vowels from a String+191 in the arena
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