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    🔤 Strings — Practice Problems

    🎯 All Problems Hub ← Back to Strings 📊 DSA Hub
    25
    Total
    12
    Solved
    9
    Easy
    12
    Medium
    4
    Hard

    🟢 Easy

    #125 Valid Palindrome ✓ Solved
    Easy arrays two pointers strings
    🔗 Problem No notes yet
    #242 Valid Anagram ✓ Solved
    Easy strings
    🔗 Problem No notes yet
    #412 Fizz Buzz ✓ Solved
    Easy strings
    🔗 Problem 💻 Solution
    #14 Longest Common Prefix ✓ Solved
    Easy strings
    🔗 Problem 📋 Approach
    #344 Reverse String ○ Todo
    Easy recursion strings two pointers
    🔗 Problem No notes yet
    #383 Ransom Note ○ Todo
    Easy hashing strings
    🔗 Problem No notes yet
    #771 Jewels and Stones ○ Todo
    Easy hashing strings
    🔗 Problem No notes yet
    #1189 Maximum Number of Balloons ○ Todo
    Easy hashing strings
    🔗 Problem No notes yet
    #1832 Check if the Sentence Is Pangram ○ Todo
    Easy hashing strings
    🔗 Problem No notes yet

    🟡 Medium

    #3 Longest Substring Without Repeating Characters ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem 💻 Solution
    #424 Longest Repeating Character Replacement ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem No notes yet
    #567 Permutation in String ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem No notes yet
    #49 Group Anagrams ✓ Solved
    Medium strings hashing
    🔗 Problem No notes yet
    #271 Encode and Decode Strings ✓ Solved
    Medium strings
    🔗 Problem 📋 Approach
    #5 Longest Palindromic Substring ✓ Solved
    Medium strings two pointers
    🔗 Problem No notes yet
    #647 Palindromic Substrings ○ Todo
    Medium strings two pointers
    🔗 Problem No notes yet
    #17 Letter Combinations of a Phone Number ○ Todo
    Medium backtracking strings
    🔗 Problem No notes yet
    #22 Generate Parentheses ○ Todo
    Medium backtracking strings
    🔗 Problem No notes yet
    #1143 Longest Common Subsequence ○ Todo
    Medium dynamic programming strings
    🔗 Problem No notes yet
    #72 Edit Distance ○ Todo
    Medium dynamic programming strings
    🔗 Problem No notes yet
    #139 Word Break ○ Todo
    Medium dynamic programming strings
    🔗 Problem No notes yet

    🔴 Hard

    #76 Minimum Window Substring ✓ Solved
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #340 Longest Substring with At Most K Distinct Characters ○ Todo
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #127 Word Ladder ○ Todo
    Hard graphs strings
    🔗 Problem No notes yet
    #68 Text Justification ✓ Solved
    Hard strings
    🔗 Problem 📋 Approach
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