<h3 id="heading-easy">Easy</h3>
<ul>
<li><a target="_blank" href="https://leetcode.com/problems/valid-palindrome/">Valid Palindrome</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/valid-palindrome-ii/">Valid Palindrome II</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-palindrome/">Longest Palindrome</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/valid-parentheses/">Valid Parentheses</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/count-binary-substrings/">Count Binary Substrings</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/first-unique-character-in-a-string/">First Unique Character in a String</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/valid-anagram/">Valid Anagram</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-common-prefix/">Longest Common Prefix</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/is-subsequence/">Is Subsequence</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/shuffle-string/">Shuffle String</a></li>
</ul>
<h3 id="heading-medium">Medium</h3>
<ul>
<li><a target="_blank" href="https://leetcode.com/problems/sort-characters-by-frequency/">Sort Characters By Frequency</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-common-subsequence/">Longest Common Subsequence</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-palindromic-subsequence/">Longest Palindromic Subsequence</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-string-chain/">Longest String Chain</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-substring-without-repeating-characters/">Longest Substring Without Repeating Characters</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/find-all-anagrams-in-a-string/">Find All Anagrams in a String</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/letter-combinations-of-a-phone-number/">Letter Combinations of a Phone Number</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/top-k-frequent-words/">Top K Frequent Words</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/generate-parentheses/">Generate Parentheses</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/permutation-in-string/">Permutation in String</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/palindromic-substrings/">Palindromic Substrings</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/palindrome-partitioning/">Palindrome Partitioning</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/">Reverse Substrings Between Each Pair of Parentheses</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-happy-string/">Longest Happy String</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/word-break/">Word Break</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/interleaving-string/">Interleaving String</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/word-search/">Word Search</a></li>
</ul>
<h3 id="heading-hard">Hard</h3>
<ul>
<li><a target="_blank" href="https://leetcode.com/problems/minimum-window-substring/">Minimum Window Substring</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/word-search-ii/">Word Search II</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/palindrome-partitioning-ii/">Palindrome Partitioning II</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/longest-valid-parentheses/">Longest Valid Parentheses</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/distinct-subsequences/">Distinct Subsequences</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/distinct-subsequences-ii/">Distinct Subsequences II</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/minimum-insertion-steps-to-make-a-string-palindrome/">Minimum Insertion Steps to Make a String Palindrome</a></li>
<li><a target="_blank" href="https://leetcode.com/problems/count-different-palindromic-subsequences/">Count Different Palindromic Subsequences</a></li>
</ul>

### Easy

- **[Valid Palindrome](https://leetcode.com/problems/valid-palindrome/)**
- **[Valid Palindrome II](https://leetcode.com/problems/valid-palindrome-ii/)**
- **[Longest Palindrome](https://leetcode.com/problems/longest-palindrome/)**
- **[Valid Parentheses](https://leetcode.com/problems/valid-parentheses/)**
- **[Count Binary Substrings](https://leetcode.com/problems/count-binary-substrings/)**
- **[First Unique Character in a String](https://leetcode.com/problems/first-unique-character-in-a-string/)**
- **[Valid Anagram](https://leetcode.com/problems/valid-anagram/)**
- **[Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix/)**
- **[Is Subsequence](https://leetcode.com/problems/is-subsequence/)**
- **[Shuffle String](https://leetcode.com/problems/shuffle-string/)**

### Medium

- **[Sort Characters By Frequency](https://leetcode.com/problems/sort-characters-by-frequency/)**
- **[Longest Common Subsequence](https://leetcode.com/problems/longest-common-subsequence/)**
- [**Longest Palindromic Subsequence**](https://leetcode.com/problems/longest-palindromic-subsequence/)
- **[Longest String Chain](https://leetcode.com/problems/longest-string-chain/)**
- **[Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/)**
- **[Find All Anagrams in a String](https://leetcode.com/problems/find-all-anagrams-in-a-string/)**
- **[Letter Combinations of a Phone Number](https://leetcode.com/problems/letter-combinations-of-a-phone-number/)**
- **[Top K Frequent Words](https://leetcode.com/problems/top-k-frequent-words/)**
- **[Generate Parentheses](https://leetcode.com/problems/generate-parentheses/)**
- **[Permutation in String](https://leetcode.com/problems/permutation-in-string/)**
- **[Palindromic Substrings](https://leetcode.com/problems/palindromic-substrings/)**
- **[Palindrome Partitioning](https://leetcode.com/problems/palindrome-partitioning/)**
- **[Reverse Substrings Between Each Pair of Parentheses](https://leetcode.com/problems/reverse-substrings-between-each-pair-of-parentheses/)**
- **[Longest Happy String](https://leetcode.com/problems/longest-happy-string/)**
- **[Word Break](https://leetcode.com/problems/word-break/)**
- **[Interleaving String](https://leetcode.com/problems/interleaving-string/)**
- **[Word Search](https://leetcode.com/problems/word-search/)**

### Hard 

- **[Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)**
- **[Word Search II](https://leetcode.com/problems/word-search-ii/)**
- **[Palindrome Partitioning II](https://leetcode.com/problems/palindrome-partitioning-ii/)**
- **[Longest Valid Parentheses](https://leetcode.com/problems/longest-valid-parentheses/)**
- **[Distinct Subsequences](https://leetcode.com/problems/distinct-subsequences/)**
- **[Distinct Subsequences II](https://leetcode.com/problems/distinct-subsequences-ii/)**
- **[Minimum Insertion Steps to Make a String Palindrome](https://leetcode.com/problems/minimum-insertion-steps-to-make-a-string-palindrome/)**
- **[Count Different Palindromic Subsequences](https://leetcode.com/problems/count-different-palindromic-subsequences/)**

Leetcode Curated Problems: String

Easy

Medium

Hard

All about my learnings in the CS & Software Engineering World. Currently, sharing my solutions to popular coding questions with occasional notes on System Design.


All about my learnings in the CS &amp; Software Engineering World. Currently, sharing my solutions to popular coding questions with occasional notes on System Design.


Leetcode Curated Problems: String

Table of contents

Easy

Medium

Hard