--- title: String type: docs --- # String | No. | Title | Solution | Difficulty | TimeComplexity | SpaceComplexity |Favorite| Acceptance | |:--------:|:------- | :--------: | :----------: | :----: | :-----: | :-----: |:-----: | |0003|Longest Substring Without Repeating Characters|[Go]({{< relref "/ChapterFour/0003.Longest-Substring-Without-Repeating-Characters.md" >}})|Medium| O(n)| O(1)|❤️|31.3%| |0013|Roman to Integer|[Go]({{< relref "/ChapterFour/0013.Roman-to-Integer.md" >}})|Easy||||56.4%| |0017|Letter Combinations of a Phone Number|[Go]({{< relref "/ChapterFour/0017.Letter-Combinations-of-a-Phone-Number.md" >}})|Medium| O(log n)| O(1)||48.8%| |0020|Valid Parentheses|[Go]({{< relref "/ChapterFour/0020.Valid-Parentheses.md" >}})|Easy| O(log n)| O(1)||39.8%| |0022|Generate Parentheses|[Go]({{< relref "/ChapterFour/0022.Generate-Parentheses.md" >}})|Medium| O(log n)| O(1)||64.9%| |0028|Implement strStr()|[Go]({{< relref "/ChapterFour/0028.Implement-strStr.md" >}})|Easy| O(n)| O(1)||35.1%| |0030|Substring with Concatenation of All Words|[Go]({{< relref "/ChapterFour/0030.Substring-with-Concatenation-of-All-Words.md" >}})|Hard| O(n)| O(n)|❤️|26.1%| |0049|Group Anagrams|[Go]({{< relref "/ChapterFour/0049.Group-Anagrams.md" >}})|Medium| O(n log n)| O(n)||58.9%| |0067|Add Binary|[Go]({{< relref "/ChapterFour/0067.Add-Binary.md" >}})|Easy||||46.7%| |0071|Simplify Path|[Go]({{< relref "/ChapterFour/0071.Simplify-Path.md" >}})|Medium| O(n)| O(n)||33.6%| |0076|Minimum Window Substring|[Go]({{< relref "/ChapterFour/0076.Minimum-Window-Substring.md" >}})|Hard| O(n)| O(n)|❤️|35.8%| |0091|Decode Ways|[Go]({{< relref "/ChapterFour/0091.Decode-Ways.md" >}})|Medium| O(n)| O(n)||26.3%| |0093|Restore IP Addresses|[Go]({{< relref "/ChapterFour/0093.Restore-IP-Addresses.md" >}})|Medium| O(n)| O(n)|❤️|37.3%| |0125|Valid Palindrome|[Go]({{< relref "/ChapterFour/0125.Valid-Palindrome.md" >}})|Easy| O(n)| O(1)||38.0%| |0126|Word Ladder II|[Go]({{< relref "/ChapterFour/0126.Word-Ladder-II.md" >}})|Hard| O(n)| O(n^2)|❤️|23.5%| |0151|Reverse Words in a String|[Go]({{< relref "/ChapterFour/0151.Reverse-Words-in-a-String.md" >}})|Medium||||23.4%| |0344|Reverse String|[Go]({{< relref "/ChapterFour/0344.Reverse-String.md" >}})|Easy| O(n)| O(1)||70.1%| |0345|Reverse Vowels of a String|[Go]({{< relref "/ChapterFour/0345.Reverse-Vowels-of-a-String.md" >}})|Easy| O(n)| O(1)||44.9%| |0385|Mini Parser|[Go]({{< relref "/ChapterFour/0385.Mini-Parser.md" >}})|Medium||||34.3%| |0387|First Unique Character in a String|[Go]({{< relref "/ChapterFour/0387.First-Unique-Character-in-a-String.md" >}})|Easy||||53.7%| |0537|Complex Number Multiplication|[Go]({{< relref "/ChapterFour/0537.Complex-Number-Multiplication.md" >}})|Medium||||68.3%| |0541|Reverse String II|[Go]({{< relref "/ChapterFour/0541.Reverse-String-II.md" >}})|Easy||||49.0%| |0557|Reverse Words in a String III|[Go]({{< relref "/ChapterFour/0557.Reverse-Words-in-a-String-III.md" >}})|Easy||||71.6%| |0632|Smallest Range Covering Elements from K Lists|[Go]({{< relref "/ChapterFour/0632.Smallest-Range-Covering-Elements-from-K-Lists.md" >}})|Hard||||54.0%| |0767|Reorganize String|[Go]({{< relref "/ChapterFour/0767.Reorganize-String.md" >}})|Medium| O(n log n)| O(log n) |❤️|49.9%| |0819|Most Common Word|[Go]({{< relref "/ChapterFour/0819.Most-Common-Word.md" >}})|Easy||||45.4%| |0842|Split Array into Fibonacci Sequence|[Go]({{< relref "/ChapterFour/0842.Split-Array-into-Fibonacci-Sequence.md" >}})|Medium| O(n^2)| O(1)|❤️|36.7%| |0856|Score of Parentheses|[Go]({{< relref "/ChapterFour/0856.Score-of-Parentheses.md" >}})|Medium| O(n)| O(n)||62.3%| |0925|Long Pressed Name|[Go]({{< relref "/ChapterFour/0925.Long-Pressed-Name.md" >}})|Easy| O(n)| O(1)||38.3%| |1003|Check If Word Is Valid After Substitutions|[Go]({{< relref "/ChapterFour/1003.Check-If-Word-Is-Valid-After-Substitutions.md" >}})|Medium| O(n)| O(1)||56.2%| |1108|Defanging an IP Address|[Go]({{< relref "/ChapterFour/1108.Defanging-an-IP-Address.md" >}})|Easy||||88.5%| |1170|Compare Strings by Frequency of the Smallest Character|[Go]({{< relref "/ChapterFour/1170.Compare-Strings-by-Frequency-of-the-Smallest-Character.md" >}})|Medium||||59.5%| |1189|Maximum Number of Balloons|[Go]({{< relref "/ChapterFour/1189.Maximum-Number-of-Balloons.md" >}})|Easy||||61.7%| |1221|Split a String in Balanced Strings|[Go]({{< relref "/ChapterFour/1221.Split-a-String-in-Balanced-Strings.md" >}})|Easy||||84.1%| |1234|Replace the Substring for Balanced String|[Go]({{< relref "/ChapterFour/1234.Replace-the-Substring-for-Balanced-String.md" >}})|Medium||||34.4%| |1455|Check If a Word Occurs As a Prefix of Any Word in a Sentence|[Go]({{< relref "/ChapterFour/1455.Check-If-a-Word-Occurs-As-a-Prefix-of-Any-Word-in-a-Sentence.md" >}})|Easy||||64.6%| |1573|Number of Ways to Split a String|[Go]({{< relref "/ChapterFour/1573.Number-of-Ways-to-Split-a-String.md" >}})|Medium||||30.9%| |1653|Minimum Deletions to Make String Balanced|[Go]({{< relref "/ChapterFour/1653.Minimum-Deletions-to-Make-String-Balanced.md" >}})|Medium||||50.2%| |1662|Check If Two String Arrays are Equivalent|[Go]({{< relref "/ChapterFour/1662.Check-If-Two-String-Arrays-are-Equivalent.md" >}})|Easy||||83.5%| |1668|Maximum Repeating Substring|[Go]({{< relref "/ChapterFour/1668.Maximum-Repeating-Substring.md" >}})|Easy||||38.6%| |1678|Goal Parser Interpretation|[Go]({{< relref "/ChapterFour/1678.Goal-Parser-Interpretation.md" >}})|Easy||||86.3%| |1684|Count the Number of Consistent Strings|[Go]({{< relref "/ChapterFour/1684.Count-the-Number-of-Consistent-Strings.md" >}})|Easy||||83.9%| |1694|Reformat Phone Number|[Go]({{< relref "/ChapterFour/1694.Reformat-Phone-Number.md" >}})|Easy||||66.7%| |------------|-------------------------------------------------------|-------| ----------------| ---------------|-------------|-------------|-------------| ----------------------------------------------

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