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| No. | Title | Solution | Difficulty | TimeComplexity | SpaceComplexity |Favorite| Acceptance |
|:--------:|:------- | :--------: | :----------: | :----: | :-----: | :-----: |:-----: |
|0003|Longest Substring Without Repeating Characters|[Go]({{< relref "/ChapterFour/0001~0099/0003.Longest-Substring-Without-Repeating-Characters.md" >}})|Medium| O(n)| O(1)|❤️|32.9%|
|0005|Longest Palindromic Substring|[Go]({{< relref "/ChapterFour/0001~0099/0005.Longest-Palindromic-Substring.md" >}})|Medium||||31.7%|
|0006|Zigzag Conversion|[Go]({{< relref "/ChapterFour/0001~0099/0006.Zigzag-Conversion.md" >}})|Medium||||41.1%|
|0003|Longest Substring Without Repeating Characters|[Go]({{< relref "/ChapterFour/0001~0099/0003.Longest-Substring-Without-Repeating-Characters.md" >}})|Medium| O(n)| O(1)|❤️|33.1%|
|0005|Longest Palindromic Substring|[Go]({{< relref "/ChapterFour/0001~0099/0005.Longest-Palindromic-Substring.md" >}})|Medium||||31.8%|
|0006|Zigzag Conversion|[Go]({{< relref "/ChapterFour/0001~0099/0006.Zigzag-Conversion.md" >}})|Medium||||41.6%|
|0008|String to Integer (atoi)|[Go]({{< relref "/ChapterFour/0001~0099/0008.String-to-Integer-atoi.md" >}})|Medium||||16.5%|
|0012|Integer to Roman|[Go]({{< relref "/ChapterFour/0001~0099/0012.Integer-to-Roman.md" >}})|Medium||||59.1%|
|0012|Integer to Roman|[Go]({{< relref "/ChapterFour/0001~0099/0012.Integer-to-Roman.md" >}})|Medium||||59.4%|
|0013|Roman to Integer|[Go]({{< relref "/ChapterFour/0001~0099/0013.Roman-to-Integer.md" >}})|Easy||||57.9%|
|0014|Longest Common Prefix|[Go]({{< relref "/ChapterFour/0001~0099/0014.Longest-Common-Prefix.md" >}})|Easy||||39.0%|
|0017|Letter Combinations of a Phone Number|[Go]({{< relref "/ChapterFour/0001~0099/0017.Letter-Combinations-of-a-Phone-Number.md" >}})|Medium| O(log n)| O(1)||53.1%|
|0020|Valid Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0020.Valid-Parentheses.md" >}})|Easy| O(log n)| O(1)||40.6%|
|0022|Generate Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0022.Generate-Parentheses.md" >}})|Medium| O(log n)| O(1)||69.5%|
|0028|Implement strStr()|[Go]({{< relref "/ChapterFour/0001~0099/0028.Implement-strStr.md" >}})|Easy| O(n)| O(1)||35.6%|
|0030|Substring with Concatenation of All Words|[Go]({{< relref "/ChapterFour/0001~0099/0030.Substring-with-Concatenation-of-All-Words.md" >}})|Hard| O(n)| O(n)|❤️|27.8%|
|0032|Longest Valid Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0032.Longest-Valid-Parentheses.md" >}})|Hard||||31.1%|
|0043|Multiply Strings|[Go]({{< relref "/ChapterFour/0001~0099/0043.Multiply-Strings.md" >}})|Medium||||37.4%|
|0049|Group Anagrams|[Go]({{< relref "/ChapterFour/0001~0099/0049.Group-Anagrams.md" >}})|Medium| O(n log n)| O(n)||63.5%|
|0058|Length of Last Word|[Go]({{< relref "/ChapterFour/0001~0099/0058.Length-of-Last-Word.md" >}})|Easy||||36.8%|
|0065|Valid Number|[Go]({{< relref "/ChapterFour/0001~0099/0065.Valid-Number.md" >}})|Hard||||17.9%|
|0067|Add Binary|[Go]({{< relref "/ChapterFour/0001~0099/0067.Add-Binary.md" >}})|Easy||||50.1%|
|0071|Simplify Path|[Go]({{< relref "/ChapterFour/0001~0099/0071.Simplify-Path.md" >}})|Medium| O(n)| O(n)||37.5%|
|0076|Minimum Window Substring|[Go]({{< relref "/ChapterFour/0001~0099/0076.Minimum-Window-Substring.md" >}})|Hard| O(n)| O(n)|❤️|38.7%|
|0091|Decode Ways|[Go]({{< relref "/ChapterFour/0001~0099/0091.Decode-Ways.md" >}})|Medium| O(n)| O(n)||29.8%|
|0093|Restore IP Addresses|[Go]({{< relref "/ChapterFour/0001~0099/0093.Restore-IP-Addresses.md" >}})|Medium| O(n)| O(n)|❤️|41.3%|
|0097|Interleaving String|[Go]({{< relref "/ChapterFour/0001~0099/0097.Interleaving-String.md" >}})|Medium||||34.5%|
|0115|Distinct Subsequences|[Go]({{< relref "/ChapterFour/0100~0199/0115.Distinct-Subsequences.md" >}})|Hard||||42.0%|
|0125|Valid Palindrome|[Go]({{< relref "/ChapterFour/0100~0199/0125.Valid-Palindrome.md" >}})|Easy| O(n)| O(1)||41.0%|
|0126|Word Ladder II|[Go]({{< relref "/ChapterFour/0100~0199/0126.Word-Ladder-II.md" >}})|Hard| O(n)| O(n^2)|❤️|26.7%|
|0127|Word Ladder|[Go]({{< relref "/ChapterFour/0100~0199/0127.Word-Ladder.md" >}})|Hard||||35.1%|
|0131|Palindrome Partitioning|[Go]({{< relref "/ChapterFour/0100~0199/0131.Palindrome-Partitioning.md" >}})|Medium||||58.8%|
|0151|Reverse Words in a String|[Go]({{< relref "/ChapterFour/0100~0199/0151.Reverse-Words-in-a-String.md" >}})|Medium||||28.0%|
|0168|Excel Sheet Column Title|[Go]({{< relref "/ChapterFour/0100~0199/0168.Excel-Sheet-Column-Title.md" >}})|Easy||||33.7%|
|0171|Excel Sheet Column Number|[Go]({{< relref "/ChapterFour/0100~0199/0171.Excel-Sheet-Column-Number.md" >}})|Easy||||60.4%|
|0179|Largest Number|[Go]({{< relref "/ChapterFour/0100~0199/0179.Largest-Number.md" >}})|Medium||||32.6%|
|0187|Repeated DNA Sequences|[Go]({{< relref "/ChapterFour/0100~0199/0187.Repeated-DNA-Sequences.md" >}})|Medium||||44.2%|
|0205|Isomorphic Strings|[Go]({{< relref "/ChapterFour/0200~0299/0205.Isomorphic-Strings.md" >}})|Easy||||42.0%|
|0208|Implement Trie (Prefix Tree)|[Go]({{< relref "/ChapterFour/0200~0299/0208.Implement-Trie-Prefix-Tree.md" >}})|Medium||||57.4%|
|0014|Longest Common Prefix|[Go]({{< relref "/ChapterFour/0001~0099/0014.Longest-Common-Prefix.md" >}})|Easy||||39.4%|
|0017|Letter Combinations of a Phone Number|[Go]({{< relref "/ChapterFour/0001~0099/0017.Letter-Combinations-of-a-Phone-Number.md" >}})|Medium| O(log n)| O(1)||53.6%|
|0020|Valid Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0020.Valid-Parentheses.md" >}})|Easy| O(log n)| O(1)||40.9%|
|0022|Generate Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0022.Generate-Parentheses.md" >}})|Medium| O(log n)| O(1)||70.1%|
|0028|Implement strStr()|[Go]({{< relref "/ChapterFour/0001~0099/0028.Implement-strStr.md" >}})|Easy| O(n)| O(1)||35.9%|
|0030|Substring with Concatenation of All Words|[Go]({{< relref "/ChapterFour/0001~0099/0030.Substring-with-Concatenation-of-All-Words.md" >}})|Hard| O(n)| O(n)|❤️|28.1%|
|0032|Longest Valid Parentheses|[Go]({{< relref "/ChapterFour/0001~0099/0032.Longest-Valid-Parentheses.md" >}})|Hard||||31.3%|
|0043|Multiply Strings|[Go]({{< relref "/ChapterFour/0001~0099/0043.Multiply-Strings.md" >}})|Medium||||37.7%|
|0049|Group Anagrams|[Go]({{< relref "/ChapterFour/0001~0099/0049.Group-Anagrams.md" >}})|Medium| O(n log n)| O(n)||64.2%|
|0058|Length of Last Word|[Go]({{< relref "/ChapterFour/0001~0099/0058.Length-of-Last-Word.md" >}})|Easy||||37.7%|
|0065|Valid Number|[Go]({{< relref "/ChapterFour/0001~0099/0065.Valid-Number.md" >}})|Hard||||18.2%|
|0067|Add Binary|[Go]({{< relref "/ChapterFour/0001~0099/0067.Add-Binary.md" >}})|Easy||||50.5%|
|0071|Simplify Path|[Go]({{< relref "/ChapterFour/0001~0099/0071.Simplify-Path.md" >}})|Medium| O(n)| O(n)||38.8%|
|0076|Minimum Window Substring|[Go]({{< relref "/ChapterFour/0001~0099/0076.Minimum-Window-Substring.md" >}})|Hard| O(n)| O(n)|❤️|39.0%|
|0091|Decode Ways|[Go]({{< relref "/ChapterFour/0001~0099/0091.Decode-Ways.md" >}})|Medium| O(n)| O(n)||30.3%|
|0093|Restore IP Addresses|[Go]({{< relref "/ChapterFour/0001~0099/0093.Restore-IP-Addresses.md" >}})|Medium| O(n)| O(n)|❤️|41.9%|
|0097|Interleaving String|[Go]({{< relref "/ChapterFour/0001~0099/0097.Interleaving-String.md" >}})|Medium||||34.8%|
|0115|Distinct Subsequences|[Go]({{< relref "/ChapterFour/0100~0199/0115.Distinct-Subsequences.md" >}})|Hard||||42.3%|
|0125|Valid Palindrome|[Go]({{< relref "/ChapterFour/0100~0199/0125.Valid-Palindrome.md" >}})|Easy| O(n)| O(1)||41.7%|
|0126|Word Ladder II|[Go]({{< relref "/ChapterFour/0100~0199/0126.Word-Ladder-II.md" >}})|Hard| O(n)| O(n^2)|❤️|27.0%|
|0127|Word Ladder|[Go]({{< relref "/ChapterFour/0100~0199/0127.Word-Ladder.md" >}})|Hard||||35.5%|
|0131|Palindrome Partitioning|[Go]({{< relref "/ChapterFour/0100~0199/0131.Palindrome-Partitioning.md" >}})|Medium||||59.5%|
|0151|Reverse Words in a String|[Go]({{< relref "/ChapterFour/0100~0199/0151.Reverse-Words-in-a-String.md" >}})|Medium||||28.5%|
|0168|Excel Sheet Column Title|[Go]({{< relref "/ChapterFour/0100~0199/0168.Excel-Sheet-Column-Title.md" >}})|Easy||||33.9%|
|0171|Excel Sheet Column Number|[Go]({{< relref "/ChapterFour/0100~0199/0171.Excel-Sheet-Column-Number.md" >}})|Easy||||60.6%|
|0179|Largest Number|[Go]({{< relref "/ChapterFour/0100~0199/0179.Largest-Number.md" >}})|Medium||||32.9%|
|0187|Repeated DNA Sequences|[Go]({{< relref "/ChapterFour/0100~0199/0187.Repeated-DNA-Sequences.md" >}})|Medium||||44.7%|
|0205|Isomorphic Strings|[Go]({{< relref "/ChapterFour/0200~0299/0205.Isomorphic-Strings.md" >}})|Easy||||42.1%|
|0208|Implement Trie (Prefix Tree)|[Go]({{< relref "/ChapterFour/0200~0299/0208.Implement-Trie-Prefix-Tree.md" >}})|Medium||||58.2%|
|0211|Design Add and Search Words Data Structure|[Go]({{< relref "/ChapterFour/0200~0299/0211.Design-Add-and-Search-Words-Data-Structure.md" >}})|Medium||||44.0%|
|0212|Word Search II|[Go]({{< relref "/ChapterFour/0200~0299/0212.Word-Search-II.md" >}})|Hard||||38.4%|
|0224|Basic Calculator|[Go]({{< relref "/ChapterFour/0200~0299/0224.Basic-Calculator.md" >}})|Hard||||40.2%|
|0227|Basic Calculator II|[Go]({{< relref "/ChapterFour/0200~0299/0227.Basic-Calculator-II.md" >}})|Medium||||41.3%|
|0242|Valid Anagram|[Go]({{< relref "/ChapterFour/0200~0299/0242.Valid-Anagram.md" >}})|Easy||||61.1%|
|0257|Binary Tree Paths|[Go]({{< relref "/ChapterFour/0200~0299/0257.Binary-Tree-Paths.md" >}})|Easy||||58.0%|
|0290|Word Pattern|[Go]({{< relref "/ChapterFour/0200~0299/0290.Word-Pattern.md" >}})|Easy||||40.1%|
|0297|Serialize and Deserialize Binary Tree|[Go]({{< relref "/ChapterFour/0200~0299/0297.Serialize-and-Deserialize-Binary-Tree.md" >}})|Hard||||53.3%|
|0299|Bulls and Cows|[Go]({{< relref "/ChapterFour/0200~0299/0299.Bulls-and-Cows.md" >}})|Medium||||46.9%|
|0301|Remove Invalid Parentheses|[Go]({{< relref "/ChapterFour/0300~0399/0301.Remove-Invalid-Parentheses.md" >}})|Hard||||46.6%|
|0306|Additive Number|[Go]({{< relref "/ChapterFour/0300~0399/0306.Additive-Number.md" >}})|Medium||||30.5%|
|0318|Maximum Product of Word Lengths|[Go]({{< relref "/ChapterFour/0300~0399/0318.Maximum-Product-of-Word-Lengths.md" >}})|Medium||||56.4%|
|0331|Verify Preorder Serialization of a Binary Tree|[Go]({{< relref "/ChapterFour/0300~0399/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md" >}})|Medium||||43.6%|
|0344|Reverse String|[Go]({{< relref "/ChapterFour/0300~0399/0344.Reverse-String.md" >}})|Easy| O(n)| O(1)||73.8%|
|0345|Reverse Vowels of a String|[Go]({{< relref "/ChapterFour/0300~0399/0345.Reverse-Vowels-of-a-String.md" >}})|Easy| O(n)| O(1)||46.7%|
|0383|Ransom Note|[Go]({{< relref "/ChapterFour/0300~0399/0383.Ransom-Note.md" >}})|Easy||||55.6%|
|0385|Mini Parser|[Go]({{< relref "/ChapterFour/0300~0399/0385.Mini-Parser.md" >}})|Medium||||35.7%|
|0387|First Unique Character in a String|[Go]({{< relref "/ChapterFour/0300~0399/0387.First-Unique-Character-in-a-String.md" >}})|Easy||||56.7%|
|0212|Word Search II|[Go]({{< relref "/ChapterFour/0200~0299/0212.Word-Search-II.md" >}})|Hard||||38.0%|
|0224|Basic Calculator|[Go]({{< relref "/ChapterFour/0200~0299/0224.Basic-Calculator.md" >}})|Hard||||40.5%|
|0227|Basic Calculator II|[Go]({{< relref "/ChapterFour/0200~0299/0227.Basic-Calculator-II.md" >}})|Medium||||41.6%|
|0242|Valid Anagram|[Go]({{< relref "/ChapterFour/0200~0299/0242.Valid-Anagram.md" >}})|Easy||||61.4%|
|0257|Binary Tree Paths|[Go]({{< relref "/ChapterFour/0200~0299/0257.Binary-Tree-Paths.md" >}})|Easy||||58.7%|
|0290|Word Pattern|[Go]({{< relref "/ChapterFour/0200~0299/0290.Word-Pattern.md" >}})|Easy||||40.2%|
|0297|Serialize and Deserialize Binary Tree|[Go]({{< relref "/ChapterFour/0200~0299/0297.Serialize-and-Deserialize-Binary-Tree.md" >}})|Hard||||53.8%|
|0299|Bulls and Cows|[Go]({{< relref "/ChapterFour/0200~0299/0299.Bulls-and-Cows.md" >}})|Medium||||47.2%|
|0301|Remove Invalid Parentheses|[Go]({{< relref "/ChapterFour/0300~0399/0301.Remove-Invalid-Parentheses.md" >}})|Hard||||46.9%|
|0306|Additive Number|[Go]({{< relref "/ChapterFour/0300~0399/0306.Additive-Number.md" >}})|Medium||||30.6%|
|0318|Maximum Product of Word Lengths|[Go]({{< relref "/ChapterFour/0300~0399/0318.Maximum-Product-of-Word-Lengths.md" >}})|Medium||||56.7%|
|0331|Verify Preorder Serialization of a Binary Tree|[Go]({{< relref "/ChapterFour/0300~0399/0331.Verify-Preorder-Serialization-of-a-Binary-Tree.md" >}})|Medium||||43.7%|
|0344|Reverse String|[Go]({{< relref "/ChapterFour/0300~0399/0344.Reverse-String.md" >}})|Easy| O(n)| O(1)||74.9%|
|0345|Reverse Vowels of a String|[Go]({{< relref "/ChapterFour/0300~0399/0345.Reverse-Vowels-of-a-String.md" >}})|Easy| O(n)| O(1)||47.0%|
|0383|Ransom Note|[Go]({{< relref "/ChapterFour/0300~0399/0383.Ransom-Note.md" >}})|Easy||||55.8%|
|0385|Mini Parser|[Go]({{< relref "/ChapterFour/0300~0399/0385.Mini-Parser.md" >}})|Medium||||35.9%|
|0387|First Unique Character in a String|[Go]({{< relref "/ChapterFour/0300~0399/0387.First-Unique-Character-in-a-String.md" >}})|Easy||||57.1%|
|0389|Find the Difference|[Go]({{< relref "/ChapterFour/0300~0399/0389.Find-the-Difference.md" >}})|Easy||||60.5%|
|0392|Is Subsequence|[Go]({{< relref "/ChapterFour/0300~0399/0392.Is-Subsequence.md" >}})|Easy||||50.9%|
|0394|Decode String|[Go]({{< relref "/ChapterFour/0300~0399/0394.Decode-String.md" >}})|Medium||||56.0%|
|0395|Longest Substring with At Least K Repeating Characters|[Go]({{< relref "/ChapterFour/0300~0399/0395.Longest-Substring-with-At-Least-K-Repeating-Characters.md" >}})|Medium||||44.5%|
|0392|Is Subsequence|[Go]({{< relref "/ChapterFour/0300~0399/0392.Is-Subsequence.md" >}})|Easy||||51.0%|
|0394|Decode String|[Go]({{< relref "/ChapterFour/0300~0399/0394.Decode-String.md" >}})|Medium||||56.3%|
|0395|Longest Substring with At Least K Repeating Characters|[Go]({{< relref "/ChapterFour/0300~0399/0395.Longest-Substring-with-At-Least-K-Repeating-Characters.md" >}})|Medium||||44.6%|
|0402|Remove K Digits|[Go]({{< relref "/ChapterFour/0400~0499/0402.Remove-K-Digits.md" >}})|Medium||||30.5%|
|0409|Longest Palindrome|[Go]({{< relref "/ChapterFour/0400~0499/0409.Longest-Palindrome.md" >}})|Easy||||53.3%|
|0412|Fizz Buzz|[Go]({{< relref "/ChapterFour/0400~0499/0412.Fizz-Buzz.md" >}})|Easy||||66.2%|
|0409|Longest Palindrome|[Go]({{< relref "/ChapterFour/0400~0499/0409.Longest-Palindrome.md" >}})|Easy||||53.6%|
|0412|Fizz Buzz|[Go]({{< relref "/ChapterFour/0400~0499/0412.Fizz-Buzz.md" >}})|Easy||||66.7%|
|0423|Reconstruct Original Digits from English|[Go]({{< relref "/ChapterFour/0400~0499/0423.Reconstruct-Original-Digits-from-English.md" >}})|Medium||||51.2%|
|0424|Longest Repeating Character Replacement|[Go]({{< relref "/ChapterFour/0400~0499/0424.Longest-Repeating-Character-Replacement.md" >}})|Medium||||50.5%|
|0433|Minimum Genetic Mutation|[Go]({{< relref "/ChapterFour/0400~0499/0433.Minimum-Genetic-Mutation.md" >}})|Medium||||45.7%|
|0424|Longest Repeating Character Replacement|[Go]({{< relref "/ChapterFour/0400~0499/0424.Longest-Repeating-Character-Replacement.md" >}})|Medium||||50.8%|
|0433|Minimum Genetic Mutation|[Go]({{< relref "/ChapterFour/0400~0499/0433.Minimum-Genetic-Mutation.md" >}})|Medium||||46.8%|
|0434|Number of Segments in a String|[Go]({{< relref "/ChapterFour/0400~0499/0434.Number-of-Segments-in-a-String.md" >}})|Easy||||37.9%|
|0438|Find All Anagrams in a String|[Go]({{< relref "/ChapterFour/0400~0499/0438.Find-All-Anagrams-in-a-String.md" >}})|Medium||||48.0%|
|0451|Sort Characters By Frequency|[Go]({{< relref "/ChapterFour/0400~0499/0451.Sort-Characters-By-Frequency.md" >}})|Medium||||67.4%|
|0474|Ones and Zeroes|[Go]({{< relref "/ChapterFour/0400~0499/0474.Ones-and-Zeroes.md" >}})|Medium||||44.4%|
|0488|Zuma Game|[Go]({{< relref "/ChapterFour/0400~0499/0488.Zuma-Game.md" >}})|Hard||||36.7%|
|0500|Keyboard Row|[Go]({{< relref "/ChapterFour/0500~0599/0500.Keyboard-Row.md" >}})|Easy||||67.7%|
|0438|Find All Anagrams in a String|[Go]({{< relref "/ChapterFour/0400~0499/0438.Find-All-Anagrams-in-a-String.md" >}})|Medium||||48.3%|
|0451|Sort Characters By Frequency|[Go]({{< relref "/ChapterFour/0400~0499/0451.Sort-Characters-By-Frequency.md" >}})|Medium||||67.8%|
|0474|Ones and Zeroes|[Go]({{< relref "/ChapterFour/0400~0499/0474.Ones-and-Zeroes.md" >}})|Medium||||44.6%|
|0488|Zuma Game|[Go]({{< relref "/ChapterFour/0400~0499/0488.Zuma-Game.md" >}})|Hard||||36.1%|
|0500|Keyboard Row|[Go]({{< relref "/ChapterFour/0500~0599/0500.Keyboard-Row.md" >}})|Easy||||68.0%|
|0520|Detect Capital|[Go]({{< relref "/ChapterFour/0500~0599/0520.Detect-Capital.md" >}})|Easy||||55.7%|
|0524|Longest Word in Dictionary through Deleting|[Go]({{< relref "/ChapterFour/0500~0599/0524.Longest-Word-in-Dictionary-through-Deleting.md" >}})|Medium||||50.8%|
|0535|Encode and Decode TinyURL|[Go]({{< relref "/ChapterFour/0500~0599/0535.Encode-and-Decode-TinyURL.md" >}})|Medium||||83.3%|
|0524|Longest Word in Dictionary through Deleting|[Go]({{< relref "/ChapterFour/0500~0599/0524.Longest-Word-in-Dictionary-through-Deleting.md" >}})|Medium||||50.9%|
|0535|Encode and Decode TinyURL|[Go]({{< relref "/ChapterFour/0500~0599/0535.Encode-and-Decode-TinyURL.md" >}})|Medium||||85.4%|
|0537|Complex Number Multiplication|[Go]({{< relref "/ChapterFour/0500~0599/0537.Complex-Number-Multiplication.md" >}})|Medium||||71.1%|
|0541|Reverse String II|[Go]({{< relref "/ChapterFour/0500~0599/0541.Reverse-String-II.md" >}})|Easy||||50.1%|
|0551|Student Attendance Record I|[Go]({{< relref "/ChapterFour/0500~0599/0551.Student-Attendance-Record-I.md" >}})|Easy||||47.4%|
|0557|Reverse Words in a String III|[Go]({{< relref "/ChapterFour/0500~0599/0557.Reverse-Words-in-a-String-III.md" >}})|Easy||||77.9%|
|0567|Permutation in String|[Go]({{< relref "/ChapterFour/0500~0599/0567.Permutation-in-String.md" >}})|Medium||||45.0%|
|0583|Delete Operation for Two Strings|[Go]({{< relref "/ChapterFour/0500~0599/0583.Delete-Operation-for-Two-Strings.md" >}})|Medium||||55.2%|
|0599|Minimum Index Sum of Two Lists|[Go]({{< relref "/ChapterFour/0500~0599/0599.Minimum-Index-Sum-of-Two-Lists.md" >}})|Easy||||52.9%|
|0609|Find Duplicate File in System|[Go]({{< relref "/ChapterFour/0600~0699/0609.Find-Duplicate-File-in-System.md" >}})|Medium||||63.7%|
|0647|Palindromic Substrings|[Go]({{< relref "/ChapterFour/0600~0699/0647.Palindromic-Substrings.md" >}})|Medium||||64.3%|
|0648|Replace Words|[Go]({{< relref "/ChapterFour/0600~0699/0648.Replace-Words.md" >}})|Medium||||61.7%|
|0676|Implement Magic Dictionary|[Go]({{< relref "/ChapterFour/0600~0699/0676.Implement-Magic-Dictionary.md" >}})|Medium||||56.5%|
|0541|Reverse String II|[Go]({{< relref "/ChapterFour/0500~0599/0541.Reverse-String-II.md" >}})|Easy||||50.2%|
|0551|Student Attendance Record I|[Go]({{< relref "/ChapterFour/0500~0599/0551.Student-Attendance-Record-I.md" >}})|Easy||||47.6%|
|0557|Reverse Words in a String III|[Go]({{< relref "/ChapterFour/0500~0599/0557.Reverse-Words-in-a-String-III.md" >}})|Easy||||78.7%|
|0567|Permutation in String|[Go]({{< relref "/ChapterFour/0500~0599/0567.Permutation-in-String.md" >}})|Medium||||44.7%|
|0583|Delete Operation for Two Strings|[Go]({{< relref "/ChapterFour/0500~0599/0583.Delete-Operation-for-Two-Strings.md" >}})|Medium||||55.8%|
|0599|Minimum Index Sum of Two Lists|[Go]({{< relref "/ChapterFour/0500~0599/0599.Minimum-Index-Sum-of-Two-Lists.md" >}})|Easy||||52.8%|
|0609|Find Duplicate File in System|[Go]({{< relref "/ChapterFour/0600~0699/0609.Find-Duplicate-File-in-System.md" >}})|Medium||||63.8%|
|0647|Palindromic Substrings|[Go]({{< relref "/ChapterFour/0600~0699/0647.Palindromic-Substrings.md" >}})|Medium||||64.6%|
|0648|Replace Words|[Go]({{< relref "/ChapterFour/0600~0699/0648.Replace-Words.md" >}})|Medium||||62.0%|
|0676|Implement Magic Dictionary|[Go]({{< relref "/ChapterFour/0600~0699/0676.Implement-Magic-Dictionary.md" >}})|Medium||||56.6%|
|0677|Map Sum Pairs|[Go]({{< relref "/ChapterFour/0600~0699/0677.Map-Sum-Pairs.md" >}})|Medium||||57.0%|
|0692|Top K Frequent Words|[Go]({{< relref "/ChapterFour/0600~0699/0692.Top-K-Frequent-Words.md" >}})|Medium||||54.2%|
|0696|Count Binary Substrings|[Go]({{< relref "/ChapterFour/0600~0699/0696.Count-Binary-Substrings.md" >}})|Easy||||64.6%|
|0709|To Lower Case|[Go]({{< relref "/ChapterFour/0700~0799/0709.To-Lower-Case.md" >}})|Easy||||81.1%|
|0720|Longest Word in Dictionary|[Go]({{< relref "/ChapterFour/0700~0799/0720.Longest-Word-in-Dictionary.md" >}})|Medium||||50.8%|
|0721|Accounts Merge|[Go]({{< relref "/ChapterFour/0700~0799/0721.Accounts-Merge.md" >}})|Medium||||55.5%|
|0692|Top K Frequent Words|[Go]({{< relref "/ChapterFour/0600~0699/0692.Top-K-Frequent-Words.md" >}})|Medium||||54.4%|
|0696|Count Binary Substrings|[Go]({{< relref "/ChapterFour/0600~0699/0696.Count-Binary-Substrings.md" >}})|Easy||||64.9%|
|0709|To Lower Case|[Go]({{< relref "/ChapterFour/0700~0799/0709.To-Lower-Case.md" >}})|Easy||||81.4%|
|0720|Longest Word in Dictionary|[Go]({{< relref "/ChapterFour/0700~0799/0720.Longest-Word-in-Dictionary.md" >}})|Medium||||51.0%|
|0721|Accounts Merge|[Go]({{< relref "/ChapterFour/0700~0799/0721.Accounts-Merge.md" >}})|Medium||||55.9%|
|0726|Number of Atoms|[Go]({{< relref "/ChapterFour/0700~0799/0726.Number-of-Atoms.md" >}})|Hard||||51.7%|
|0745|Prefix and Suffix Search|[Go]({{< relref "/ChapterFour/0700~0799/0745.Prefix-and-Suffix-Search.md" >}})|Hard||||36.4%|
|0748|Shortest Completing Word|[Go]({{< relref "/ChapterFour/0700~0799/0748.Shortest-Completing-Word.md" >}})|Easy||||58.7%|
|0752|Open the Lock|[Go]({{< relref "/ChapterFour/0700~0799/0752.Open-the-Lock.md" >}})|Medium||||55.2%|
|0763|Partition Labels|[Go]({{< relref "/ChapterFour/0700~0799/0763.Partition-Labels.md" >}})|Medium||||78.7%|
|0767|Reorganize String|[Go]({{< relref "/ChapterFour/0700~0799/0767.Reorganize-String.md" >}})|Medium| O(n log n)| O(log n) |❤️|51.8%|
|0771|Jewels and Stones|[Go]({{< relref "/ChapterFour/0700~0799/0771.Jewels-and-Stones.md" >}})|Easy||||87.6%|
|0784|Letter Case Permutation|[Go]({{< relref "/ChapterFour/0700~0799/0784.Letter-Case-Permutation.md" >}})|Medium||||71.9%|
|0791|Custom Sort String|[Go]({{< relref "/ChapterFour/0700~0799/0791.Custom-Sort-String.md" >}})|Medium||||68.7%|
|0792|Number of Matching Subsequences|[Go]({{< relref "/ChapterFour/0700~0799/0792.Number-of-Matching-Subsequences.md" >}})|Medium||||50.3%|
|0794|Valid Tic-Tac-Toe State|[Go]({{< relref "/ChapterFour/0700~0799/0794.Valid-Tic-Tac-Toe-State.md" >}})|Medium||||35.1%|
|0811|Subdomain Visit Count|[Go]({{< relref "/ChapterFour/0800~0899/0811.Subdomain-Visit-Count.md" >}})|Medium||||73.9%|
|0745|Prefix and Suffix Search|[Go]({{< relref "/ChapterFour/0700~0799/0745.Prefix-and-Suffix-Search.md" >}})|Hard||||36.5%|
|0748|Shortest Completing Word|[Go]({{< relref "/ChapterFour/0700~0799/0748.Shortest-Completing-Word.md" >}})|Easy||||58.9%|
|0752|Open the Lock|[Go]({{< relref "/ChapterFour/0700~0799/0752.Open-the-Lock.md" >}})|Medium||||55.3%|
|0763|Partition Labels|[Go]({{< relref "/ChapterFour/0700~0799/0763.Partition-Labels.md" >}})|Medium||||79.6%|
|0767|Reorganize String|[Go]({{< relref "/ChapterFour/0700~0799/0767.Reorganize-String.md" >}})|Medium| O(n log n)| O(log n) |❤️|52.1%|
|0771|Jewels and Stones|[Go]({{< relref "/ChapterFour/0700~0799/0771.Jewels-and-Stones.md" >}})|Easy||||87.7%|
|0784|Letter Case Permutation|[Go]({{< relref "/ChapterFour/0700~0799/0784.Letter-Case-Permutation.md" >}})|Medium||||72.4%|
|0791|Custom Sort String|[Go]({{< relref "/ChapterFour/0700~0799/0791.Custom-Sort-String.md" >}})|Medium||||69.2%|
|0792|Number of Matching Subsequences|[Go]({{< relref "/ChapterFour/0700~0799/0792.Number-of-Matching-Subsequences.md" >}})|Medium||||50.5%|
|0794|Valid Tic-Tac-Toe State|[Go]({{< relref "/ChapterFour/0700~0799/0794.Valid-Tic-Tac-Toe-State.md" >}})|Medium||||35.2%|
|0811|Subdomain Visit Count|[Go]({{< relref "/ChapterFour/0800~0899/0811.Subdomain-Visit-Count.md" >}})|Medium||||74.2%|
|0816|Ambiguous Coordinates|[Go]({{< relref "/ChapterFour/0800~0899/0816.Ambiguous-Coordinates.md" >}})|Medium||||55.9%|
|0819|Most Common Word|[Go]({{< relref "/ChapterFour/0800~0899/0819.Most-Common-Word.md" >}})|Easy||||45.3%|
|0820|Short Encoding of Words|[Go]({{< relref "/ChapterFour/0800~0899/0820.Short-Encoding-of-Words.md" >}})|Medium||||55.1%|
|0821|Shortest Distance to a Character|[Go]({{< relref "/ChapterFour/0800~0899/0821.Shortest-Distance-to-a-Character.md" >}})|Easy||||70.9%|
|0828|Count Unique Characters of All Substrings of a Given String|[Go]({{< relref "/ChapterFour/0800~0899/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md" >}})|Hard||||49.3%|
|0830|Positions of Large Groups|[Go]({{< relref "/ChapterFour/0800~0899/0830.Positions-of-Large-Groups.md" >}})|Easy||||51.3%|
|0838|Push Dominoes|[Go]({{< relref "/ChapterFour/0800~0899/0838.Push-Dominoes.md" >}})|Medium||||52.2%|
|0839|Similar String Groups|[Go]({{< relref "/ChapterFour/0800~0899/0839.Similar-String-Groups.md" >}})|Hard||||45.0%|
|0842|Split Array into Fibonacci Sequence|[Go]({{< relref "/ChapterFour/0800~0899/0842.Split-Array-into-Fibonacci-Sequence.md" >}})|Medium| O(n^2)| O(1)|❤️|37.7%|
|0844|Backspace String Compare|[Go]({{< relref "/ChapterFour/0800~0899/0844.Backspace-String-Compare.md" >}})|Easy||||47.4%|
|0819|Most Common Word|[Go]({{< relref "/ChapterFour/0800~0899/0819.Most-Common-Word.md" >}})|Easy||||45.2%|
|0820|Short Encoding of Words|[Go]({{< relref "/ChapterFour/0800~0899/0820.Short-Encoding-of-Words.md" >}})|Medium||||55.3%|
|0821|Shortest Distance to a Character|[Go]({{< relref "/ChapterFour/0800~0899/0821.Shortest-Distance-to-a-Character.md" >}})|Easy||||71.0%|
|0828|Count Unique Characters of All Substrings of a Given String|[Go]({{< relref "/ChapterFour/0800~0899/0828.Count-Unique-Characters-of-All-Substrings-of-a-Given-String.md" >}})|Hard||||49.9%|
|0830|Positions of Large Groups|[Go]({{< relref "/ChapterFour/0800~0899/0830.Positions-of-Large-Groups.md" >}})|Easy||||51.4%|
|0838|Push Dominoes|[Go]({{< relref "/ChapterFour/0800~0899/0838.Push-Dominoes.md" >}})|Medium||||52.3%|
|0839|Similar String Groups|[Go]({{< relref "/ChapterFour/0800~0899/0839.Similar-String-Groups.md" >}})|Hard||||45.5%|
|0842|Split Array into Fibonacci Sequence|[Go]({{< relref "/ChapterFour/0800~0899/0842.Split-Array-into-Fibonacci-Sequence.md" >}})|Medium| O(n^2)| O(1)|❤️|37.8%|
|0844|Backspace String Compare|[Go]({{< relref "/ChapterFour/0800~0899/0844.Backspace-String-Compare.md" >}})|Easy||||48.0%|
|0856|Score of Parentheses|[Go]({{< relref "/ChapterFour/0800~0899/0856.Score-of-Parentheses.md" >}})|Medium| O(n)| O(n)||65.4%|
|0859|Buddy Strings|[Go]({{< relref "/ChapterFour/0800~0899/0859.Buddy-Strings.md" >}})|Easy||||28.8%|
|0880|Decoded String at Index|[Go]({{< relref "/ChapterFour/0800~0899/0880.Decoded-String-at-Index.md" >}})|Medium||||28.3%|
|0884|Uncommon Words from Two Sentences|[Go]({{< relref "/ChapterFour/0800~0899/0884.Uncommon-Words-from-Two-Sentences.md" >}})|Easy||||65.4%|
|0884|Uncommon Words from Two Sentences|[Go]({{< relref "/ChapterFour/0800~0899/0884.Uncommon-Words-from-Two-Sentences.md" >}})|Easy||||65.6%|
|0890|Find and Replace Pattern|[Go]({{< relref "/ChapterFour/0800~0899/0890.Find-and-Replace-Pattern.md" >}})|Medium||||75.6%|
|0916|Word Subsets|[Go]({{< relref "/ChapterFour/0900~0999/0916.Word-Subsets.md" >}})|Medium||||52.7%|
|0921|Minimum Add to Make Parentheses Valid|[Go]({{< relref "/ChapterFour/0900~0999/0921.Minimum-Add-to-Make-Parentheses-Valid.md" >}})|Medium||||77.3%|
|0925|Long Pressed Name|[Go]({{< relref "/ChapterFour/0900~0999/0925.Long-Pressed-Name.md" >}})|Easy| O(n)| O(1)||34.9%|
|0942|DI String Match|[Go]({{< relref "/ChapterFour/0900~0999/0942.DI-String-Match.md" >}})|Easy||||75.6%|
|0949|Largest Time for Given Digits|[Go]({{< relref "/ChapterFour/0900~0999/0949.Largest-Time-for-Given-Digits.md" >}})|Medium||||35.5%|
|0953|Verifying an Alien Dictionary|[Go]({{< relref "/ChapterFour/0900~0999/0953.Verifying-an-Alien-Dictionary.md" >}})|Easy||||52.4%|
|0916|Word Subsets|[Go]({{< relref "/ChapterFour/0900~0999/0916.Word-Subsets.md" >}})|Medium||||52.6%|
|0921|Minimum Add to Make Parentheses Valid|[Go]({{< relref "/ChapterFour/0900~0999/0921.Minimum-Add-to-Make-Parentheses-Valid.md" >}})|Medium||||77.1%|
|0925|Long Pressed Name|[Go]({{< relref "/ChapterFour/0900~0999/0925.Long-Pressed-Name.md" >}})|Easy| O(n)| O(1)||34.6%|
|0942|DI String Match|[Go]({{< relref "/ChapterFour/0900~0999/0942.DI-String-Match.md" >}})|Easy||||75.8%|
|0949|Largest Time for Given Digits|[Go]({{< relref "/ChapterFour/0900~0999/0949.Largest-Time-for-Given-Digits.md" >}})|Medium||||35.4%|
|0953|Verifying an Alien Dictionary|[Go]({{< relref "/ChapterFour/0900~0999/0953.Verifying-an-Alien-Dictionary.md" >}})|Easy||||52.5%|
|0966|Vowel Spellchecker|[Go]({{< relref "/ChapterFour/0900~0999/0966.Vowel-Spellchecker.md" >}})|Medium||||51.6%|
|0981|Time Based Key-Value Store|[Go]({{< relref "/ChapterFour/0900~0999/0981.Time-Based-Key-Value-Store.md" >}})|Medium||||52.8%|
|0984|String Without AAA or BBB|[Go]({{< relref "/ChapterFour/0900~0999/0984.String-Without-AAA-or-BBB.md" >}})|Medium||||41.7%|
|0990|Satisfiability of Equality Equations|[Go]({{< relref "/ChapterFour/0900~0999/0990.Satisfiability-of-Equality-Equations.md" >}})|Medium||||49.7%|
|0981|Time Based Key-Value Store|[Go]({{< relref "/ChapterFour/0900~0999/0981.Time-Based-Key-Value-Store.md" >}})|Medium||||52.7%|
|0984|String Without AAA or BBB|[Go]({{< relref "/ChapterFour/0900~0999/0984.String-Without-AAA-or-BBB.md" >}})|Medium||||42.3%|
|0990|Satisfiability of Equality Equations|[Go]({{< relref "/ChapterFour/0900~0999/0990.Satisfiability-of-Equality-Equations.md" >}})|Medium||||50.1%|
|1002|Find Common Characters|[Go]({{< relref "/ChapterFour/1000~1099/1002.Find-Common-Characters.md" >}})|Easy||||68.4%|
|1003|Check If Word Is Valid After Substitutions|[Go]({{< relref "/ChapterFour/1000~1099/1003.Check-If-Word-Is-Valid-After-Substitutions.md" >}})|Medium| O(n)| O(1)||57.7%|
|1021|Remove Outermost Parentheses|[Go]({{< relref "/ChapterFour/1000~1099/1021.Remove-Outermost-Parentheses.md" >}})|Easy||||79.7%|
|1028|Recover a Tree From Preorder Traversal|[Go]({{< relref "/ChapterFour/1000~1099/1028.Recover-a-Tree-From-Preorder-Traversal.md" >}})|Hard||||72.2%|
|1047|Remove All Adjacent Duplicates In String|[Go]({{< relref "/ChapterFour/1000~1099/1047.Remove-All-Adjacent-Duplicates-In-String.md" >}})|Easy||||71.0%|
|1048|Longest String Chain|[Go]({{< relref "/ChapterFour/1000~1099/1048.Longest-String-Chain.md" >}})|Medium||||57.6%|
|1078|Occurrences After Bigram|[Go]({{< relref "/ChapterFour/1000~1099/1078.Occurrences-After-Bigram.md" >}})|Easy||||64.3%|
|1079|Letter Tile Possibilities|[Go]({{< relref "/ChapterFour/1000~1099/1079.Letter-Tile-Possibilities.md" >}})|Medium||||76.2%|
|1108|Defanging an IP Address|[Go]({{< relref "/ChapterFour/1100~1199/1108.Defanging-an-IP-Address.md" >}})|Easy||||88.9%|
|1111|Maximum Nesting Depth of Two Valid Parentheses Strings|[Go]({{< relref "/ChapterFour/1100~1199/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md" >}})|Medium||||72.8%|
|1003|Check If Word Is Valid After Substitutions|[Go]({{< relref "/ChapterFour/1000~1099/1003.Check-If-Word-Is-Valid-After-Substitutions.md" >}})|Medium| O(n)| O(1)||57.9%|
|1021|Remove Outermost Parentheses|[Go]({{< relref "/ChapterFour/1000~1099/1021.Remove-Outermost-Parentheses.md" >}})|Easy||||79.8%|
|1028|Recover a Tree From Preorder Traversal|[Go]({{< relref "/ChapterFour/1000~1099/1028.Recover-a-Tree-From-Preorder-Traversal.md" >}})|Hard||||72.4%|
|1047|Remove All Adjacent Duplicates In String|[Go]({{< relref "/ChapterFour/1000~1099/1047.Remove-All-Adjacent-Duplicates-In-String.md" >}})|Easy||||70.9%|
|1048|Longest String Chain|[Go]({{< relref "/ChapterFour/1000~1099/1048.Longest-String-Chain.md" >}})|Medium||||57.8%|
|1078|Occurrences After Bigram|[Go]({{< relref "/ChapterFour/1000~1099/1078.Occurrences-After-Bigram.md" >}})|Easy||||64.2%|
|1079|Letter Tile Possibilities|[Go]({{< relref "/ChapterFour/1000~1099/1079.Letter-Tile-Possibilities.md" >}})|Medium||||76.1%|
|1108|Defanging an IP Address|[Go]({{< relref "/ChapterFour/1100~1199/1108.Defanging-an-IP-Address.md" >}})|Easy||||89.0%|
|1111|Maximum Nesting Depth of Two Valid Parentheses Strings|[Go]({{< relref "/ChapterFour/1100~1199/1111.Maximum-Nesting-Depth-of-Two-Valid-Parentheses-Strings.md" >}})|Medium||||73.2%|
|1143|Longest Common Subsequence|[Go]({{< relref "/ChapterFour/1100~1199/1143.Longest-Common-Subsequence.md" >}})|Medium||||58.9%|
|1154|Day of the Year|[Go]({{< relref "/ChapterFour/1100~1199/1154.Day-of-the-Year.md" >}})|Easy||||51.0%|
|1154|Day of the Year|[Go]({{< relref "/ChapterFour/1100~1199/1154.Day-of-the-Year.md" >}})|Easy||||50.9%|
|1160|Find Words That Can Be Formed by Characters|[Go]({{< relref "/ChapterFour/1100~1199/1160.Find-Words-That-Can-Be-Formed-by-Characters.md" >}})|Easy||||67.7%|
|1170|Compare Strings by Frequency of the Smallest Character|[Go]({{< relref "/ChapterFour/1100~1199/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md" >}})|Medium||||61.0%|
|1178|Number of Valid Words for Each Puzzle|[Go]({{< relref "/ChapterFour/1100~1199/1178.Number-of-Valid-Words-for-Each-Puzzle.md" >}})|Hard||||46.9%|
|1170|Compare Strings by Frequency of the Smallest Character|[Go]({{< relref "/ChapterFour/1100~1199/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md" >}})|Medium||||61.1%|
|1178|Number of Valid Words for Each Puzzle|[Go]({{< relref "/ChapterFour/1100~1199/1178.Number-of-Valid-Words-for-Each-Puzzle.md" >}})|Hard||||46.8%|
|1189|Maximum Number of Balloons|[Go]({{< relref "/ChapterFour/1100~1199/1189.Maximum-Number-of-Balloons.md" >}})|Easy||||62.5%|
|1190|Reverse Substrings Between Each Pair of Parentheses|[Go]({{< relref "/ChapterFour/1100~1199/1190.Reverse-Substrings-Between-Each-Pair-of-Parentheses.md" >}})|Medium||||65.6%|
|1202|Smallest String With Swaps|[Go]({{< relref "/ChapterFour/1200~1299/1202.Smallest-String-With-Swaps.md" >}})|Medium||||52.3%|
|1208|Get Equal Substrings Within Budget|[Go]({{< relref "/ChapterFour/1200~1299/1208.Get-Equal-Substrings-Within-Budget.md" >}})|Medium||||46.3%|
|1209|Remove All Adjacent Duplicates in String II|[Go]({{< relref "/ChapterFour/1200~1299/1209.Remove-All-Adjacent-Duplicates-in-String-II.md" >}})|Medium||||56.0%|
|1221|Split a String in Balanced Strings|[Go]({{< relref "/ChapterFour/1200~1299/1221.Split-a-String-in-Balanced-Strings.md" >}})|Easy||||84.7%|
|1234|Replace the Substring for Balanced String|[Go]({{< relref "/ChapterFour/1200~1299/1234.Replace-the-Substring-for-Balanced-String.md" >}})|Medium||||36.1%|
|1239|Maximum Length of a Concatenated String with Unique Characters|[Go]({{< relref "/ChapterFour/1200~1299/1239.Maximum-Length-of-a-Concatenated-String-with-Unique-Characters.md" >}})|Medium||||50.6%|
|1249|Minimum Remove to Make Valid Parentheses|[Go]({{< relref "/ChapterFour/1200~1299/1249.Minimum-Remove-to-Make-Valid-Parentheses.md" >}})|Medium||||65.2%|
|1268|Search Suggestions System|[Go]({{< relref "/ChapterFour/1200~1299/1268.Search-Suggestions-System.md" >}})|Medium||||65.6%|
|1332|Remove Palindromic Subsequences|[Go]({{< relref "/ChapterFour/1300~1399/1332.Remove-Palindromic-Subsequences.md" >}})|Easy||||69.4%|
|1396|Design Underground System|[Go]({{< relref "/ChapterFour/1300~1399/1396.Design-Underground-System.md" >}})|Medium||||71.8%|
|1190|Reverse Substrings Between Each Pair of Parentheses|[Go]({{< relref "/ChapterFour/1100~1199/1190.Reverse-Substrings-Between-Each-Pair-of-Parentheses.md" >}})|Medium||||65.7%|
|1202|Smallest String With Swaps|[Go]({{< relref "/ChapterFour/1200~1299/1202.Smallest-String-With-Swaps.md" >}})|Medium||||57.1%|
|1208|Get Equal Substrings Within Budget|[Go]({{< relref "/ChapterFour/1200~1299/1208.Get-Equal-Substrings-Within-Budget.md" >}})|Medium||||46.5%|
|1209|Remove All Adjacent Duplicates in String II|[Go]({{< relref "/ChapterFour/1200~1299/1209.Remove-All-Adjacent-Duplicates-in-String-II.md" >}})|Medium||||55.9%|
|1221|Split a String in Balanced Strings|[Go]({{< relref "/ChapterFour/1200~1299/1221.Split-a-String-in-Balanced-Strings.md" >}})|Easy||||84.6%|
|1234|Replace the Substring for Balanced String|[Go]({{< relref "/ChapterFour/1200~1299/1234.Replace-the-Substring-for-Balanced-String.md" >}})|Medium||||36.2%|
|1239|Maximum Length of a Concatenated String with Unique Characters|[Go]({{< relref "/ChapterFour/1200~1299/1239.Maximum-Length-of-a-Concatenated-String-with-Unique-Characters.md" >}})|Medium||||50.5%|
|1249|Minimum Remove to Make Valid Parentheses|[Go]({{< relref "/ChapterFour/1200~1299/1249.Minimum-Remove-to-Make-Valid-Parentheses.md" >}})|Medium||||65.7%|
|1268|Search Suggestions System|[Go]({{< relref "/ChapterFour/1200~1299/1268.Search-Suggestions-System.md" >}})|Medium||||65.3%|
|1332|Remove Palindromic Subsequences|[Go]({{< relref "/ChapterFour/1300~1399/1332.Remove-Palindromic-Subsequences.md" >}})|Easy||||69.6%|
|1396|Design Underground System|[Go]({{< relref "/ChapterFour/1300~1399/1396.Design-Underground-System.md" >}})|Medium||||73.5%|
|1446|Consecutive Characters|[Go]({{< relref "/ChapterFour/1400~1499/1446.Consecutive-Characters.md" >}})|Easy||||62.0%|
|1455|Check If a Word Occurs As a Prefix of Any Word in a Sentence|[Go]({{< relref "/ChapterFour/1400~1499/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md" >}})|Easy||||64.6%|
|1455|Check If a Word Occurs As a Prefix of Any Word in a Sentence|[Go]({{< relref "/ChapterFour/1400~1499/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md" >}})|Easy||||64.5%|
|1461|Check If a String Contains All Binary Codes of Size K|[Go]({{< relref "/ChapterFour/1400~1499/1461.Check-If-a-String-Contains-All-Binary-Codes-of-Size-K.md" >}})|Medium||||54.5%|
|1573|Number of Ways to Split a String|[Go]({{< relref "/ChapterFour/1500~1599/1573.Number-of-Ways-to-Split-a-String.md" >}})|Medium||||32.0%|
|1576|Replace All ?'s to Avoid Consecutive Repeating Characters|[Go]({{< relref "/ChapterFour/1500~1599/1576.Replace-All-s-to-Avoid-Consecutive-Repeating-Characters.md" >}})|Easy||||50.0%|
|1573|Number of Ways to Split a String|[Go]({{< relref "/ChapterFour/1500~1599/1573.Number-of-Ways-to-Split-a-String.md" >}})|Medium||||32.1%|
|1576|Replace All ?'s to Avoid Consecutive Repeating Characters|[Go]({{< relref "/ChapterFour/1500~1599/1576.Replace-All-s-to-Avoid-Consecutive-Repeating-Characters.md" >}})|Easy||||49.7%|
|1614|Maximum Nesting Depth of the Parentheses|[Go]({{< relref "/ChapterFour/1600~1699/1614.Maximum-Nesting-Depth-of-the-Parentheses.md" >}})|Easy||||82.9%|
|1624|Largest Substring Between Two Equal Characters|[Go]({{< relref "/ChapterFour/1600~1699/1624.Largest-Substring-Between-Two-Equal-Characters.md" >}})|Easy||||59.2%|
|1629|Slowest Key|[Go]({{< relref "/ChapterFour/1600~1699/1629.Slowest-Key.md" >}})|Easy||||59.7%|
|1647|Minimum Deletions to Make Character Frequencies Unique|[Go]({{< relref "/ChapterFour/1600~1699/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md" >}})|Medium||||56.3%|
|1653|Minimum Deletions to Make String Balanced|[Go]({{< relref "/ChapterFour/1600~1699/1653.Minimum-Deletions-to-Make-String-Balanced.md" >}})|Medium||||55.3%|
|1657|Determine if Two Strings Are Close|[Go]({{< relref "/ChapterFour/1600~1699/1657.Determine-if-Two-Strings-Are-Close.md" >}})|Medium||||54.6%|
|1662|Check If Two String Arrays are Equivalent|[Go]({{< relref "/ChapterFour/1600~1699/1662.Check-If-Two-String-Arrays-are-Equivalent.md" >}})|Easy||||81.9%|
|1663|Smallest String With A Given Numeric Value|[Go]({{< relref "/ChapterFour/1600~1699/1663.Smallest-String-With-A-Given-Numeric-Value.md" >}})|Medium||||64.1%|
|1668|Maximum Repeating Substring|[Go]({{< relref "/ChapterFour/1600~1699/1668.Maximum-Repeating-Substring.md" >}})|Easy||||39.5%|
|1678|Goal Parser Interpretation|[Go]({{< relref "/ChapterFour/1600~1699/1678.Goal-Parser-Interpretation.md" >}})|Easy||||85.4%|
|1624|Largest Substring Between Two Equal Characters|[Go]({{< relref "/ChapterFour/1600~1699/1624.Largest-Substring-Between-Two-Equal-Characters.md" >}})|Easy||||59.3%|
|1629|Slowest Key|[Go]({{< relref "/ChapterFour/1600~1699/1629.Slowest-Key.md" >}})|Easy||||59.6%|
|1647|Minimum Deletions to Make Character Frequencies Unique|[Go]({{< relref "/ChapterFour/1600~1699/1647.Minimum-Deletions-to-Make-Character-Frequencies-Unique.md" >}})|Medium||||56.5%|
|1653|Minimum Deletions to Make String Balanced|[Go]({{< relref "/ChapterFour/1600~1699/1653.Minimum-Deletions-to-Make-String-Balanced.md" >}})|Medium||||56.6%|
|1657|Determine if Two Strings Are Close|[Go]({{< relref "/ChapterFour/1600~1699/1657.Determine-if-Two-Strings-Are-Close.md" >}})|Medium||||54.5%|
|1662|Check If Two String Arrays are Equivalent|[Go]({{< relref "/ChapterFour/1600~1699/1662.Check-If-Two-String-Arrays-are-Equivalent.md" >}})|Easy||||82.0%|
|1663|Smallest String With A Given Numeric Value|[Go]({{< relref "/ChapterFour/1600~1699/1663.Smallest-String-With-A-Given-Numeric-Value.md" >}})|Medium||||67.0%|
|1668|Maximum Repeating Substring|[Go]({{< relref "/ChapterFour/1600~1699/1668.Maximum-Repeating-Substring.md" >}})|Easy||||39.6%|
|1678|Goal Parser Interpretation|[Go]({{< relref "/ChapterFour/1600~1699/1678.Goal-Parser-Interpretation.md" >}})|Easy||||85.8%|
|1684|Count the Number of Consistent Strings|[Go]({{< relref "/ChapterFour/1600~1699/1684.Count-the-Number-of-Consistent-Strings.md" >}})|Easy||||81.8%|
|1689|Partitioning Into Minimum Number Of Deci-Binary Numbers|[Go]({{< relref "/ChapterFour/1600~1699/1689.Partitioning-Into-Minimum-Number-Of-Deci-Binary-Numbers.md" >}})|Medium||||87.8%|
|1694|Reformat Phone Number|[Go]({{< relref "/ChapterFour/1600~1699/1694.Reformat-Phone-Number.md" >}})|Easy||||65.1%|
|1704|Determine if String Halves Are Alike|[Go]({{< relref "/ChapterFour/1700~1799/1704.Determine-if-String-Halves-Are-Alike.md" >}})|Easy||||78.1%|
|1736|Latest Time by Replacing Hidden Digits|[Go]({{< relref "/ChapterFour/1700~1799/1736.Latest-Time-by-Replacing-Hidden-Digits.md" >}})|Easy||||42.0%|
|1758|Minimum Changes To Make Alternating Binary String|[Go]({{< relref "/ChapterFour/1700~1799/1758.Minimum-Changes-To-Make-Alternating-Binary-String.md" >}})|Easy||||59.3%|
|1763|Longest Nice Substring|[Go]({{< relref "/ChapterFour/1700~1799/1763.Longest-Nice-Substring.md" >}})|Easy||||62.0%|
|1816|Truncate Sentence|[Go]({{< relref "/ChapterFour/1800~1899/1816.Truncate-Sentence.md" >}})|Easy||||81.0%|
|2167|Minimum Time to Remove All Cars Containing Illegal Goods|[Go]({{< relref "/ChapterFour/2100~2199/2167.Minimum-Time-to-Remove-All-Cars-Containing-Illegal-Goods.md" >}})|Hard||||38.0%|
|2182|Construct String With Repeat Limit|[Go]({{< relref "/ChapterFour/2100~2199/2182.Construct-String-With-Repeat-Limit.md" >}})|Medium||||50.4%|
|1694|Reformat Phone Number|[Go]({{< relref "/ChapterFour/1600~1699/1694.Reformat-Phone-Number.md" >}})|Easy||||64.9%|
|1704|Determine if String Halves Are Alike|[Go]({{< relref "/ChapterFour/1700~1799/1704.Determine-if-String-Halves-Are-Alike.md" >}})|Easy||||78.0%|
|1736|Latest Time by Replacing Hidden Digits|[Go]({{< relref "/ChapterFour/1700~1799/1736.Latest-Time-by-Replacing-Hidden-Digits.md" >}})|Easy||||42.1%|
|1758|Minimum Changes To Make Alternating Binary String|[Go]({{< relref "/ChapterFour/1700~1799/1758.Minimum-Changes-To-Make-Alternating-Binary-String.md" >}})|Easy||||59.2%|
|1763|Longest Nice Substring|[Go]({{< relref "/ChapterFour/1700~1799/1763.Longest-Nice-Substring.md" >}})|Easy||||61.8%|
|1816|Truncate Sentence|[Go]({{< relref "/ChapterFour/1800~1899/1816.Truncate-Sentence.md" >}})|Easy||||81.3%|
|2167|Minimum Time to Remove All Cars Containing Illegal Goods|[Go]({{< relref "/ChapterFour/2100~2199/2167.Minimum-Time-to-Remove-All-Cars-Containing-Illegal-Goods.md" >}})|Hard||||39.1%|
|2182|Construct String With Repeat Limit|[Go]({{< relref "/ChapterFour/2100~2199/2182.Construct-String-With-Repeat-Limit.md" >}})|Medium||||51.1%|
|------------|-------------------------------------------------------|-------| ----------------| ---------------|-------------|-------------|-------------|