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Leetcode

# Title Solutions Difficulty Tags
0001 Two Sum Solution Easy Hash Table, Array
0002 Add Two Numbers Solution Medium Linked List, Math, Recursion
0003 Longest Substring Without Repeating Characters Solution Medium Hash Table, String, Sliding Window
0005 Longest Palindromic Substring Solution Medium String, Dynamic Programming
0007 Reverse Integer Solution Easy Math
0009 Palindrome Number Solution Easy Math
0011 Container With Most Water Solution Medium Array, Two Pointers, Greedy
0013 Roman to Integer Solution Easy Hash Table, Math, String
0014 Longest Common Prefix Solution Easy String
0015 3Sum Solution Medium Array, Two Pointers, Sorting
0016 3Sum Closest Solution Medium Array, Two Pointers, Sorting
0017 Letter Combinations of a Phone Number Solution Medium Hash Table, String, Backtracking
0018 4Sum Solution Medium Array, Two Pointers, Sorting
0019 Remove Nth Node From End of List Solution Medium Linked List, Two Pointers
0020 Valid Parentheses Solution Easy String, Stack
0021 Merge Two Sorted Lists Solution Easy Linked List, Recursion
0024 Swap Nodes in Pairs Solution Medium Linked List
0025 Reverse Nodes in k-Group Solution Hard Linked List
0026 Remove Duplicates from Sorted Array Solution Easy Array, Two Pointers
0027 Remove Element Solution Easy Array, Two Pointers
0028 Implement strStr() Solution Easy Two Pointers, String, String Matching
0031 Next Permutation Solution Medium Array, Two Pointers
0033 Search in Rotated Sorted Array Solution Medium Binary Search, Array
0034 Find First and Last Position of Element in Sorted Array Solution Medium Binary Search, Array
0035 Search Insert Position Solution Easy Binary Search, Array
0046 Permutations Solution Medium Array, Backtracking
0048 Rotate Image Solution Medium Array, Math, Matrix
0049 Group Anagrams Solution Medium Array, Hash Table, String, Sorting
0051 N-Queens Solution Hard Array, Backtracking
0052 N-Queens II Solution Hard Array, Backtracking
0054 Spiral Matrix Solution Medium Array, Matrix, Simulation
0055 Jump Game Solution Medium Array, Greedy
0059 Spiral Matrix II Solution Medium Array, Matrix, Simulation
0058 Length of Last Word Solution Easy String
0061 Rotate List Solution Medium LinkedList, Two Pointers
0062 Unique Paths Solution Medium Math, Dynamic Programming
0066 Plus One Solution Easy Array
0067 Add Binary Solution Easy Bit Manipulation, String
0069 Sqrt(x) Solution Easy Binary Search, Math
0070 Climbing Stairs Solution Easy Math, Dynamic Programming, Memoization
0074 Search a 2D Matrix Solution Medium Binary Search, Matrix
0075 Sort Colors Solution Medium Two Pointers, Array
0078 Subsets Solution Medium Array, Backtracking
0080 Remove Duplicates from Sorted Array II Solution Medium Two Pointers, Array
0081 Search in Rotated Sorted Array II Solution Medium Binary Search, Array
0086 Partition List Solution Medium Linked List, Two Pointers
0088 Merge Sorted Array Solution Easy Two Pointers, Array
0090 Subsets II Solution Medium Array, Backtracking
0091 Decode Ways Solution Medium String, Dynamic Programming
0092 Reverse Linked List II Solution Medium Linked List
0094 Binary Tree Inorder Traversal Solution Easy Stack, Tree, Depth-First Search, Binary Tree
0097 Interleaving String Solution Medium String, Dynamic Programming
0098 Validate Binary Search Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0100 Same Tree Solution Easy Tree, Depth-First Search, Breadth-First Search, Binary Tree
0102 Binary Tree Level Order Traversal Solution Easy Tree, Breadth-First Search, Binary Tree
0103 Binary Tree Zigzag Level Order Traversal Solution Medium Tree, Breadth-First Search, Binary Tree
0104 Maximum Depth of Binary Tree Solution Easy Tree, Depth-First Search, Breadth-First Search, Binary Tree
0105 Construct Binary Tree from Preorder and Inorder Traversal Solution Medium Array, Hash Table, Divide and Conquer, Tree, Binary Tree
0106 Construct Binary Tree from Inorder and Postorder Traversal Solution Medium Array, Hash Table, Divide and Conquer, Tree, Binary Tree
0107 Binary Tree Level Order Traversal II Solution Medium Tree, Breadth-First Search, Binary Tree
0110 Balanced Binary Tree Solution Easy Tree, Depth-First Search, Binary Tree
0111 Minimum Depth of Binary Tree Solution Easy Tree, Depth-First Search, Breadth-First Search, Binary Tree
0112 Path Sum Solution Easy Tree, Depth-First Search, Breadth-First Search, Binary Tree
0113 Path Sum II Solution Medium Backtracking, Tree, Depth-First Search, Binary Tree
0116 Populating Next Right Pointers in Each Node Solution Medium Tree, Depth-First Search, Breadth-First Search, Binary Tree
0117 Populating Next Right Pointers in Each Node II Solution Medium Tree, Depth-First Search, Breadth-First Search, Binary Tree
0118 Pascal's Triangle Solution Easy Array
0118 Pascal's Triangle II Solution Easy Array
0124 Binary Tree Maximum Path Sum Solution Hard Dynamic Programming, Tree, Depth-First Search, Binary Tree
0125 Valid Palindrome Solution Easy Two Pointers, String
0128 Longest Consecutive Sequence Solution Medium Array, Hash Table
0135 Candy Solution Hard Array, Greedy
0136 Single Number Solution Easy Bit Manipulation
0137 Single Number II Solution Medium Bit Manipulation
0141 Linked List Cycle Solution Easy Hash Table, Linked List, Two Pointers
0142 Linked List Cycle II Solution Medium Hash Table, Linked List, Two Pointers
0144 Binary Tree Preorder Traversal Solution Easy Stack, Tree, Depth-First Search, Binary Tree
0145 Binary Tree Postorder Traversal Solution Easy Stack, Tree, Depth-First Search, Binary Tree
0151 Reverse Words in a String Solution Medium String
0153 Find Minimum in Rotated Sorted Array Solution Medium Binary Search, Array
0160 Intersection of Two Linked Lists Solution Easy Hash Table, Linked List, Two Pointers
0162 Find Peak Element Solution Medium Binary Search, Array
0167 Two Sum II - Input array is sorted Solution Easy Two Pointers, Array
0169 Majority Element Solution Easy Array, Hash Table, Searching, Counting
0171 Excel Sheet Column Number Solution Easy Math
0173 Binary Search Tree Iterator Solution Medium Stack, Tree, Design, Binary Search Tree, Binary Tree, Iterator
0189 Rotate Array Solution Medium Array, Math, Two Pointers
0191 Number of 1 Bits Solution Easy Bit Manipulation
0199 Binary Tree Right Side View Solution Medium Tree, Depth-First Search, Breadth-First Search, Binary Tree
0203 Remove Linked List Elements Solution Easy Linked List
0205 Isomorphic Strings Solution Easy String, Hash Table
0206 Reverse Linked List Solution Easy Linked List, Recursion
0215 Kth Largest Element in an Array Solution Medium Array, Heap(Priority Queue)
0217 Contains Duplicate Solution Easy Array, Hash Table, Sorting
0219 Contains Duplicate II Solution Easy Array, Hash Table, Sliding Window
0225 Implement Stack using Queues Solution Easy Stack, Design, Queue
0226 Invert Binary Tree Solution Easy Tree, Depth-First Search, Binary Search Tree, Binary Tree
0229 Majority Element II Solution Medium Array, Hash Table, Searching, Counting
0230 Kth Smallest Element in a BST Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0231 Power of Two Solution Easy Math, Bit Manipulation, Recursion
0234 Palindrome Linked List Solution Easy Linked List, Two Pointers
0235 Lowest Common Ancestor of a Binary Search Tree Solution Easy Tree, Depth-First Search, Binary Search Tree, Binary Tree
0236 Lowest Common Ancestor of a Binary Tree Solution Medium Tree, Depth-First Search, Binary Tree
0237 Delete Node in a Linked List Solution Easy Linked List
0240 Search a 2D Matrix II Solution Medium Binary Search, Matrix
0242 Valid Anagram Solution Easy Hash Table, String, Sorting
0257 Binary Tree Paths Solution Easy String, Backtracking, Tree, Depth-First Search, Binary Tree
0260 Single Number III Solution Medium Bit Manipulation
0268 Missing Number Solution Easy Array, Math
0284 Peeking Iterator Solution Medium Array Design, Iterator
0289 Game of Life Solution Medium Array, Matrix, Simulation
0303 Range Sum Query - Immutable Solution Easy Array, Design, Prefix Sum
0304 Range Sum Query 2D - Immutable Solution Medium Array, Design, Matrix, Prefix Sum
0344 Reverse String Solution Easy Two Pointers, String
0345 Reverse Vowels of a String Solution Easy Two Pointers, String
0347 Top K Frequent Elements Solution Medium Array, Hash Table, Heap(Priority Queue), Counting
0349 Intersection of Two Arrays Solution Easy Array
0367 Valid Perfect Square Solution Easy Binary Search, Math
0376 Wiggle Subsequence Solution Medium Array, Greedy
0387 First Unique Character in a String Solution Easy String, Hash Table
0406 Queue Reconstruction by Height Solution Medium Array, Greedy, Sorting
0410 Split Array Largest Sum Solution Hard Binary Search, Array, Greedy
0412 Fizz Buzz Solution Easy Math, String
0451 Sort Characters By Frequency Solution Medium Hash Table, String, Heap(Priority Queue), Counting
0454 4Sum II Solution Medium Array, Hash Table
0456 132 Pattern Solution Medium Array, Stack, Monotonic Stack
0461 Hamming Distance Solution Easy Bit Manipulation
0462 Minimum Moves to Equal Array Elements II Solution Medium Array, Math, Sorting
0473 Matchsticks to Square Solution Medium Array, Backtracking
0477 Total Hamming Distance Solution Medium Bit Manipulation
0485 Max Consecutive Ones Solution Easy Array
0496 Next Greater Element I Solution Easy Array, Stack, Hash Table
0500 Keyboard Problem Solution Easy Array, String
0503 Next Greater Element II Solution Medium Array, Stack
0509 Fibonacci Number Solution Easy Math, Dynamic Programming, Recursion, Memoization
0515 Find Largest Value in Each Tree Row Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0523 Continuous Subarray Sum Solution Medium Array, Hash Table, Math, Prefix Sum
0532 K-diff Pairs in an Array Solution Medium Array, Hash Table
0535 Encode and Decode TinyURL Solution Medium Hash Table, String, Design, Hash Function
0537 Complex Number Multiplication Solution Medium String, Math
0538 Convert BST to Greater Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0540 Single Element in a Sorted Array Solution Medium Binary Search, Array
0543 Diameter of Binary Tree Solution Easy Tree, Depth-First Search, Binary Tree
0556 Next Greater Element III Solution Medium Math, String
0560 Subarray Sum Equals K Solution Medium Array, Hash Table, Prefix Sum
0576 Out of Boundary Paths Solution Medium Dynamic Programming
0581 Shortest Unsorted Continuous Subarray Solution Medium Array, Two Pointers, Sorting
0662 Maximum Width of Binary Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0665 Non-decreasing Array Solution Medium Array
0669 Trim a Binary Search Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
0671 Second Minimum Node In a Binary Tree Solution Easy Tree, Depth-First Search, Binary Tree
0680 Valid Palindrome II Solution Easy Two Pointers, String
0682 Baseball Game Solution Easy Array, Stack, Simulation
0693 Binary Number with Alternating Bits Solution Easy Bit Manipulation
0700 Search in a Binary Search Tree Solution Easy Tree, Binary Search Tree, Binary Tree
0703 Kth Largest Element in a Stream Solution Easy Design, Heap(Priority Queue), Data Stream
0704 Binary Search Solution Easy Binary Search
0705 Design HashSet Solution Easy Array, Hash Table, Linked List, Design, Hash Function
0706 Design HashMap Solution Easy Array, Hash Table, Linked List, Design, Hash Function
0709 To Lower Case Solution Easy String
0735 Asteroid Collision Solution Medium Array, Stack
0739 Daily Temperatures Solution Medium Array, Stack
0744 Find Smallest Letter Greater Than Target Solution Easy Binary Search, Array
0746 Min Cost Climbing Stairs Solution Easy Array, Dynamic Programming
0771 Jewels and Stones Solution Easy String, Hash Table
0784 Letter Case Permutation Solution Medium String, Backtracking
0844 Backspace String Compare Solution Easy String, Stack, Simulation
0852 Peak Index in a Mountain Array Solution Easy Binary Search, Array
0867 Transpose Matrix Solution Easy Array, Matrix, Simulation
0876 Middle of the Linked List Solution Easy Linked List, Two Pointers
0890 Find and Replace Pattern Solution Medium String, Hash Table
0905 Sort Array By Parity Solution Easy Array, Two Pointers, Sorting
0921 Minimum Add to Make Parentheses Valid Solution Medium String
0923 3Sum With Multiplicity Solution Medium Array, Hash Table, Two Pointers, Counting, Sorting
0929 Unique Email Address Solution Easy String
0917 Reverse Only Letters Solution Easy Two Pointers, String
0977 Squares of a Sorted Array Solution Easy Two Pointers, Array
1011 Capacity To Ship Packages Within D Days Solution Medium Binary Search, Array, Greedy
1022 Sum of Root To Leaf Binary Numbers Solution Easy Tree, Depth-First Search, Binary Tree
1038 Binary Search Tree to Greater Sum Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
1041 Robot Bounded in Circle Solution Medium String, Math
1046 Last Stone Weight Solution Easy Array, Heap(Priority Queue)
1047 Remove All Adjacent Duplicates In String Solution Easy String, Stack
1074 Number of Submatrices That Sum to Target Solution Hard Array, Hash Table, Matrix, Prefix Sum
1108 Defanging an IP Address Solution Easy String
1121 Split a String in Balanced Strings Solution Easy String
1209 Remove All Adjacent Duplicates in String II Solution Medium String, Stack
1260 Shift 2D Grid Solution Easy Array, Matrix, Simulation
1281 Subtract the Product and Sum of Digits of an Integer Solution Easy Math
1283 Find the Smallest Divisor Given a Threshold Solution Medium Binary Search, Array
1299 Replace Elements with Greatest Element on Right Side Solution Easy Array
1302 Deepest Leaves Sum Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
1332 Remove Palindromic Subsequences Solution Easy Two Pointers, String
1347 Minimum number od Steps to make two Strings Anagrams Solution Medium String
1354 Construct Target Array With Multiple Sums Solution Medium Array, Heap(Priority Queue)
1365 How Many Numbers Are Smaller Than the Current Number Solution Easy Array
1379 Find a Corresponding Node of a Binary Tree in a Clone of That Tree Solution Medium Tree, Depth-First Search, Binary Search Tree, Binary Tree
1396 Design Underground System Solution Medium Hash Table, String, Design
1423 Maximum Points You Can Obtain from Cards Solution Medium Array, Sliding Window, Prefix Sum
1431 Kids With the Greatest Number of Candies Solution Easy Array
1461 Check If a String Contains All Binary Codes of Size K Solution Medium Hash Table, String
1465 Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts Solution Medium Array, Greedy, Sorting
1470 Shuffle the Array Solution Easy Array
1480 Running Sum of 1d Array Solution Easy Array, Prefix Sum
1486 XOR Operation in an Array Solution Easy Array
1512 Number of Good Pairs Solution Easy Array
1518 Water Bottles Solution Easy Array
1528 Shuffle String Solution Easy String
1589 Crawler Log Folder Solution Easy Array, String, Stack
1614 Maximum Nesting Depth of the Parentheses Solution Easy String
1636 Sort Array by Increasing Frequency Solution Easy Array, Hash Table, Sorting
1642 Furthest Building You Can Reach Solution Medium Array, Greedy, Heap(Priority Queue)
1647 Minimum Deletions to Make Character Frequencies Unique Solution Medium String, Greedy, Sorting
1662 Check If Two String Arrays are Equivalent Solution Easy Array, String
1672 Richest Customer Wealth Solution Easy Array
1678 Goal Parser Interpretation Solution Easy String
1679 Max Number of K-Sum Pairs Solution Medium Array, Hash Table, Two Pointers, Sorting
1684 Count the Number of Consistent Strings Solution Easy String
1689 Partitioning Into Minimum Number Of Deci-Binary Numbers Solution Medium String, Greedy
1695 Maximum Erasure Value Solution Medium Array, Hash Table, Sliding Window
1696 Jump Game VI Solution Medium Array, Dynamic Programming, Queue, Sliding Window, Heap(Priority Queue), Monotonic Queue
1710 Maximum Units on a Truck Solution Easy Array, Greedy, Sorting
1721 Swapping Nodes in a Linked List Solution Medium Linked List, Two Pointers
1773 Count Items Matching a Rule Solution Easy String
1816 Truncate Sentence Solution Easy String
1832 Check if the Sentence is Pangram Solution Easy String, Hash Table
1859 Sorting the sentence Solution Easy String
1880 Check if Word Equals Summation of Two Words Solution Easy String
1886 Determine Whether Matrix Can Be Obtained By Rotation Solution Easy Array, Matrix
1925 Count Square Sum Triples Solution Easy Math
1985 Find the Kth Largest Integer in the Array Solution Medium Array, String, Heap(Priority Queue)
2099 Find Subsequence of Length K With the Largest Sum Solution Easy Array, Hash Table, Sorting, Heap(Priority Queue)
2108 Find First Palindromic String in the Array Solution Easy Array, Two Pointers, String
2177 Find Three Consecutive Integers That Sum to a Given Number Solution Medium Math, Simulation
2233 Maximum Product After K Increments Solution Medium Array, Greedy, Heap(Priority Queue)
2279 Maximum Bags With Full Capacity of Rocks Solution Medium Array, Greedy, Sorting

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Java Solutions to Leetcode Algorithm and Data Structure problems.

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