README.md

🟡 Solved Medium Problems

question	my answers	tags
2-Add Two Numbers	python
3-Longest Substring Without Repeating Characters	python, php
6-Zigzag Conversion	java (hash map), java (math)
15-3Sum	go
19-Remove Nth Node From End of List	python (two traverse)
22-Generate Parentheses	go
24-Swap Nodes in Pairs	go
28-Find the Index of the First Occurrence in a String	javascript
33-Search in Rotated Sorted Array	python
34-Find First and Last Position of Element in Sorted Array	php
36-Valid Sudoku	go (concurrency)
45-Jump Game II	java
48-Rotate Image	python
49-Group Anagrams	python
55-Jump Game	python (BFS), python (DP), java (pointer)
59-Spiral Matrix II	go
63-Unique Paths II	php
64-Minimum Path Sum	python
71-Simplify Path	javascript
73-Set Matrix Zeroes	python
80-Remove Duplicates from Sorted Array II	go, java
93-Restore IP Addresses	python
98-Validate Binary Search Tree	javascript
101-Symmetric Tree	go
102-Binary Tree Level Order Traversal	python
105-Construct Binary Tree from Preorder and Inorder Traversal	go
106-Construct Binary Tree from Inorder and Postorder Traversal	javascript
109-Convert Sorted List to Binary Search Tree	javascript
122-Best Time to Buy and Sell Stock II	python, go
128-Longest Consecutive Sequence	go
129-Sum Root to Leaf Numbers	php
133-Clone Graph	python
134-Gas Station	python
146-LRU Cache	go (heap), go (linked-list)	DS
150-Evaluate Reverse Polish Notation	go
155-Min Stack	php (array), go (stack)	DS
167-Two Sum II - Input Array Is Sorted	go
172-Factorial Trailing Zeroes	python
184-Department Highest Salary	sql
189-Rotate Array	javascript, java
198-House Robber	go
199-Binary Tree Right Side View	python
200-Number of Islands	python
208-Implement Trie (Prefix Tree)	python	DS
211-Design Add and Search Words Data Structure	go (hashmap), go (trie)
215-Kth Largest Element in an Array	go
237-Delete Node in a Linked List	python, java
238-Product of Array Except Self	go
271-Encode and Decode Strings	python
274-H-Index	go
347-Top K Frequent Elements	go
399-Evaluate Division	go
402-Remove K Digits	go
427-Construct Quad Tree	python	DS
503-Next Greater Element II	go
540-Single Element in a Sorted Array	php
547-Number of Provinces	go
554-Brick Wall	php
623-Add One Row to Tree	java
662-Maximum Width of Binary Tree	java
714-Best Time to Buy and Sell Stock with Transaction Fee	go
739-Daily Temperatures	go
785-Is Graph Bipartite?	go
791-Custom Sort String	go
792-Number of Matching Subsequences	python
853-Car Fleet	go
935-Knight Dialer	go
946-Validate Stack Sequences	javascript
970-Powerful Integers	php
983-Minimum Cost For Tickets	python (dp), python (cache)
988-Smallest String Starting From Leaf	java
994-Rotting Oranges	php
1020-Number of Enclaves	python
1027-Longest Arithmetic Subsequence	go
1091-Shortest Path in Binary Matrix	go
1146-Snapshot Array	go	DS
1161-Maximum Level Sum of a Binary Tree	go
1254-Number of Closed Islands	python
1318-Minimum Flips to Make a OR b Equal to c	go
1319-Number of Operations to Make Network Connected	python
1325-Delete Leaves With a Given Value	java
1339-Maximum Product of Splitted Binary Tree	python
1372-Longest ZigZag Path in a Binary Tree	python
1376-Time Needed to Inform All Employees	go
1396-Design Underground System	go
1424-Diagonal Traverse II	go
1443-Minimum Time to Collect All Apples in a Tree	python
1456-Maximum Number of Vowels in a Substring of Given Length	python
1466-Reorder Routes to Make All Paths Lead to the City Zero	python
1557-Minimum Number of Vertices to Reach All Nodes	go
1561-Maximum Number of Coins You Can Get	go
1630-Arithmetic Subarrays	go
1637. Widest Vertical Area Between Two Points Containing No Points	go
1685-Sum of Absolute Differences in a Sorted Array	go
1721-Swapping Nodes in a Linked List	go
1802-Maximum Value at a Given Index in a Bounded Array	go
1814-Count Nice Pairs in an Array	go
1887-Reduction Operations to Make the Array Elements Equal	go
2058-Find the Minimum and Maximum Number of Nodes Between Critical Points	go
2090-K Radius Subarray Averages	go	interview
2101-Detonate the Maximum Bombs	go (normal), go (concurrency)
2130-Maximum Twin Sum of a Linked List	go (space complexity o(n))
2181-Merge Nodes in Between Zeros	go
2300-Successful Pairs of Spells and Potions	python
2316-Count Unreachable Pairs of Nodes in an Undirected Graph	python
2352-Equal Row and Column Pairs	go
2353-Design a Food Rating System	go (heap)	DS
2390-Removing Stars From a String	javascript
2391-Minimum Amount of Time to Collect Garbage	go
2405-Optimal Partition of String	python
2439-Minimize Maximum of Array	python
2482-Difference Between Ones and Zeros in Row and Column	go
2487-Remove Nodes From Linked List	java
2536-Increment Submatrices by One	python
2545-Sort the Students by Their Kth Score	python
2546-Apply Bitwise Operations to Make Strings Equal	python
2567-Minimum Score by Changing Two Elements	python
2568-Minimum Impossible OR	python
2583-Kth Largest Sum in a Binary Tree	python
2606-Find the Substring With Maximum Cost	python
2615-Sum of Distances	python
2623-Memoize	javascript
2653-Sliding Subarray Beauty	python	DS
2698-Find the Punishment Number of an Integer	python
2718-Sum of Matrix After Queries	go
2734-Lexicographically Smallest String After Substring Operation	python
2735-Collecting Chocolates	python
2749-Minimum Operations to Make the Integer Zero	go
2750-Ways to Split Array Into Good Subarrays	go
2770-Maximum Number of Jumps to Reach the Last Index	go
2816-Double a Number Represented as a Linked List	java
2870-Minimum Number of Operations to Make Array Empty	javascript
3137-Minimum Number of Operations to Make Word K-Periodic	java
3138-Minimum Length of Anagram Concatenation	java
3147-Taking Maximum Energy From the Mystic Dungeon	java
3148-Maximum Difference Score in a Grid	java
3152-Special Array II	java
3153-Sum of Digit Differences of All Pairs	java
3163-String Compression III	java