ajdevhub

    📋 Master Problem List

    164
    Total Problems
    56
    Solved ✓
    108
    In Progress ○

    Arrays & Sliding Window

    #3 Longest Substring Without Repeating Characters ✓ Solved
    Medium arrays sliding window strings
    🔗 Problem 💻 Solution
    #121 Best Time to Buy and Sell Stock ✓ Solved
    Easy arrays sliding window
    🔗 Problem No notes yet
    #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
    #76 Minimum Window Substring ✓ Solved
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #904 Fruit Into Baskets ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #560 Subarray Sum Equals K ○ Todo
    Medium arrays sliding window hashing
    🔗 Problem No notes yet
    #930 Binary Subarrays With Sum ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #209 Minimum Size Subarray Sum ○ Todo
    Medium arrays sliding window
    🔗 Problem No notes yet
    #992 Subarrays with K Different Integers ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #340 Longest Substring with At Most K Distinct Characters ○ Todo
    Hard arrays sliding window strings
    🔗 Problem No notes yet
    #1004 Max Consecutive Ones III ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #1248 Count Number of Nice Subarrays ○ Todo
    Hard arrays sliding window
    🔗 Problem No notes yet
    #239 Sliding Window Maximum ○ Todo
    Hard queues arrays sliding window
    🔗 Problem No notes yet

    Two Pointers

    #125 Valid Palindrome ✓ Solved
    Easy arrays two pointers strings
    🔗 Problem No notes yet
    #167 Two Sum II - Input Array Is Sorted ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #15 3Sum ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #11 Container With Most Water ✓ Solved
    Medium arrays two pointers
    🔗 Problem No notes yet
    #42 Trapping Rain Water ✓ Solved
    Hard arrays two pointers
    🔗 Problem No notes yet
    #88 Merge Sorted Array ✓ Solved
    Easy searching sorting arrays two pointers
    🔗 Problem 💻 Solution
    #75 Sort Colors ✓ Solved
    Medium searching sorting arrays two pointers
    🔗 Problem 💻 Solution

    Strings

    #242 Valid Anagram ✓ Solved
    Easy 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
    #412 Fizz Buzz ✓ Solved
    Easy strings
    🔗 Problem 💻 Solution
    #14 Longest Common Prefix ✓ Solved
    Easy strings
    🔗 Problem 📋 Approach
    #68 Text Justification ✓ Solved
    Hard strings
    🔗 Problem 📋 Approach

    Linked List

    #141 Linked List Cycle ✓ Solved
    Easy linked list two pointers
    🔗 Problem 📋 Approach
    #876 Middle of the Linked List ✓ Solved
    Easy linked list two pointers
    🔗 Problem 📋 Approach
    #206 Reverse Linked List ✓ Solved
    Easy linked list
    🔗 Problem 📋 Approach
    #21 Merge Two Sorted Lists ✓ Solved
    Easy linked list
    🔗 Problem 📋 Approach
    #19 Remove Nth Node From End of List ✓ Solved
    Medium linked list two pointers
    🔗 Problem 📋 Approach
    #2 Add Two Numbers ✓ Solved
    Medium linked list
    🔗 Problem 📋 Approach
    #143 Reorder List ✓ Solved
    Medium linked list two pointers
    🔗 Problem 📋 Approach
    #25 Reverse Nodes in K-Group ✓ Solved
    Hard linked list
    🔗 Problem 📋 Approach
    #138 Copy List with Random Pointer ✓ Solved
    Medium linked list
    🔗 Problem 📋 Approach
    #146 LRU Cache ○ Todo
    Medium linked list hashing
    🔗 Problem No notes yet
    #287 Find the Duplicate Number ✓ Solved
    Medium linked list
    🔗 Problem 📋 Approach

    Stacks

    #20 Valid Parentheses ○ Todo
    Easy stacks
    🔗 Problem No notes yet
    #155 Min Stack ○ Todo
    Medium stacks
    🔗 Problem No notes yet
    #739 Daily Temperatures ○ Todo
    Medium stacks
    🔗 Problem No notes yet
    #84 Largest Rectangle in Histogram ○ Todo
    Hard stacks
    🔗 Problem No notes yet

    Trees

    #104 Maximum Depth of Binary Tree ✓ Solved
    Easy tree
    🔗 Problem 📋 Approach
    #100 Same Tree ✓ Solved
    Easy tree
    🔗 Problem 📋 Approach
    #226 Invert Binary Tree ✓ Solved
    Easy tree
    🔗 Problem 📋 Approach
    #101 Symmetric Tree ✓ Solved
    Easy tree
    🔗 Problem 📋 Approach
    #110 Balanced Binary Tree ✓ Solved
    Medium tree
    🔗 Problem 📋 Approach
    #102 Binary Tree Level Order Traversal ✓ Solved
    Medium tree
    🔗 Problem 📋 Approach
    #103 Binary Tree Zigzag Level Order Traversal ✓ Solved
    Medium tree
    🔗 Problem 📋 Approach
    #98 Validate Binary Search Tree ○ Todo
    Medium tree
    🔗 Problem No notes yet
    #235 Lowest Common Ancestor of BST ○ Todo
    Medium tree
    🔗 Problem No notes yet
    #124 Binary Tree Maximum Path Sum ○ Todo
    Hard tree
    🔗 Problem No notes yet
    #297 Serialize and Deserialize Binary Tree ○ Todo
    Hard tree
    🔗 Problem No notes yet

    Searching & Sorting

    #704 Binary Search ✓ Solved
    Easy searching sorting binary search
    🔗 Problem 💻 Solution
    #35 Search Insert Position ✓ Solved
    Easy searching sorting binary search
    🔗 Problem 📋 Approach
    #744 Find Smallest Letter Greater Than Target ✓ Solved
    Easy searching sorting
    🔗 Problem 📋 Approach
    #169 Majority Element ✓ Solved
    Easy searching sorting arrays
    🔗 Problem 💻 Solution
    #34 Find First and Last Position of Element in Sorted Array ✓ Solved
    Medium searching sorting
    🔗 Problem 💻 Solution
    #540 Single Element in a Sorted Array ✓ Solved
    Medium searching sorting
    🔗 Problem 💻 Solution
    #gfg-rotation-count Rotation Count in Rotated Sorted Array ○ Todo
    Medium searching sorting
    🔗 Problem 📋 Approach 💻 Solution
    #153 Find Minimum in Rotated Sorted Array ✓ Solved
    Medium searching sorting binary search
    🔗 Problem 💻 Solution
    #33 Search in Rotated Sorted Array ✓ Solved
    Medium searching sorting binary search
    🔗 Problem 💻 Solution
    #gfg-infinite-sorted Find Position in Infinite Sorted Array ○ Todo
    Medium searching sorting
    🔗 Problem 📋 Approach
    #gfg-first-one-binary Index of First 1 in Infinite Binary Array ○ Todo
    Medium searching sorting
    🔗 Problem 📋 Approach
    #162 Find Peak Element ✓ Solved
    Medium searching sorting binary search
    🔗 Problem 💻 Solution
    #852 Peak Index in a Mountain Array ✓ Solved
    Medium searching sorting binary search
    🔗 Problem 💻 Solution
    #gfg-search-matrix Search in Row-Column Sorted Matrix ✓ Solved
    Medium searching sorting arrays
    🔗 Problem No notes yet
    #74 Search a 2D Matrix ✓ Solved
    Medium searching sorting arrays
    🔗 Problem No notes yet
    #gfg-allocate-pages Allocate Minimum Pages ✓ Solved
    Hard searching sorting
    🔗 Problem 📋 Approach
    #875 Koko Eating Bananas ✓ Solved
    Medium searching sorting binary search
    🔗 Problem No notes yet
    #981 Time Based Key-Value Store ✓ Solved
    Medium searching sorting binary search
    🔗 Problem No notes yet
    #88 Merge Sorted Array ✓ Solved
    Easy searching sorting arrays two pointers
    🔗 Problem 💻 Solution
    #148 Sort List ✓ Solved
    Medium searching sorting linked list
    🔗 Problem 💻 Solution
    #179 Largest Number ✓ Solved
    Medium searching sorting arrays
    🔗 Problem 💻 Solution
    #75 Sort Colors ✓ Solved
    Medium searching sorting arrays two pointers
    🔗 Problem 💻 Solution
    #1095 Find in Mountain Array ✓ Solved
    Hard searching sorting binary search
    🔗 Problem 💻 Solution
    #4 Median of Two Sorted Arrays ✓ Solved
    Hard searching sorting binary search
    🔗 Problem 📋 Approach 💻 Solution
    #410 Split Array Largest Sum ○ Todo
    Hard searching sorting binary search
    🔗 Problem No notes yet
    #23 Merge k Sorted Lists ✓ Solved
    Hard searching sorting linked list heaps
    🔗 Problem 📋 Approach
    #315 Count of Smaller Numbers After Self ○ Todo
    Hard searching sorting
    🔗 Problem No notes yet
    #164 Maximum Gap ○ Todo
    Hard searching sorting
    🔗 Problem No notes yet
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