Strings · DSA Java Articles

Basic and Easy String Problems

ID	Problem	Difficulty	Section	Sheets
892	Remove Outermost Parentheses	Medium	Basic and Easy String Problems	A2Z
2863	Reverse words in a given string / Palindrome Check	Medium	Basic and Easy String Problems	A2Z
394	Largest Odd Number in a String	Easy	Basic and Easy String Problems	A2Z
395	Longest Common Prefix	Easy	Basic and Easy String Problems	A2Z SDE
393	Isomorphic String	Easy	Basic and Easy String Problems	A2Z
398	Rotate String	Easy	Basic and Easy String Problems	A2Z
2809	Check if two strings are anagram of each other	Easy	Basic and Easy String Problems	A2Z
400	Valid Anagram	Easy	Basic and Easy String Problems	SDE B75

ID	Problem	Difficulty	Section	Sheets
399	Sort Characters by Frequency	Easy	Medium String Problems	A2Z
674	Maximum Nesting Depth of the Parentheses	Medium	Medium String Problems	A2Z
903	Roman to Integer	Medium	Medium String Problems	A2Z SDE
974	String to Integer (atoi)	Medium	Medium String Problems	A2Z
2394	Count Number of Substrings	Easy	Medium String Problems	A2Z
638	Longest Palindromic Substring	Medium	Medium String Problems	A2Z B75
993	Sum of Beauty of All Substrings	Medium	Medium String Problems	A2Z
984	Reverse every word in a string	Medium	Medium String Problems	A2Z SDE
2852	Longest Palindrome in a string	Medium	Medium String Problems	SDE
2861	Implement ATOI/STRSTR	Medium	Medium String Problems	SDE
198	Compare version numbers	Medium	Medium String Problems	SDE
559	Group Words by Anagrams	Medium	Medium String Problems	B75
2794	Palindromic Substrings	Medium	Medium String Problems	B75
331	Encode and Decode Strings	Medium	Medium String Problems	B75

ID	Problem	Difficulty	Section	Sheets
983	Minimum number of bracket reversals to make an expression balanced	Hard	Hard String Problems	A2Z
982	Count and say	Hard	Hard String Problems	A2Z SDE
2399	Hashing In Strings - Theory	Easy	Hard String Problems	A2Z
979	Rabin Karp Algorithm	Hard	Hard String Problems	A2Z SDE
981	Z function	Hard	Hard String Problems	A2Z SDE
977	KMP Algorithm or LPS array	Hard	Hard String Problems	A2Z SDE
980	Shortest Palindrome	Hard	Hard String Problems	A2Z
978	Longest happy prefix	Hard	Hard String Problems	A2Z
231	Count Palindromic Subsequences	Medium	Hard String Problems	A2Z
312	Minimum insertions to make string palindrome	Hard	Hard String Problems	SDE