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README.md

LeetCode

Link Video

https://drive.google.com/drive/folders/1xUfwdy19BBA_1bLMaFR_J668iBmjBYUT?usp=sharing

LeetCode Algorithm

Hash Table

# Title Solution Difficulty Tag
1 Two Sum Two_Sum Easy Two Pointer
1647 Minimum Deletions to Make Character Frequencies Unique Minimum Deletions to Make Character Frequencies Unique Medium

Tree

# Title Solution Difficulty Tag
102 Binary Tree Level Order Traversal Binary Tree Level Order Traversal Medium Tree level
103 Binary Tree Zigzag Level Order Traversal Binary Tree Zigzag Level Order Traversal Medium Tree level
107 Binary Tree Level Order Traversal II Binary Tree Level Order Traversal II Easy Tree level
515 Find Largest Value in Each Tree Row Find Largest Value in Each Tree Row Medium Tree level
637 Average of Levels in Binary Tree Average of Levels in Binary Tree Easy Tree level
1161 Maximum Level Sum of a Binary Tree Maximum Level Sum of a Binary Tree Medium Tree level
1609 Even Odd Tree Even Odd Tree Medium Tree level

Binary Search

# Title Solution Difficulty Tag
33 Search in Rotated Sorted Array Search in Rotated Sorted Array Medium
34 Find First and Last Position of Element in Sorted Array Find First and Last Position of Element in Sorted Array Medium
153 Find Minimum in Rotated Sorted Array Find Minimum in Rotated Sorted Array Medium
162 Find Peak Element Find Peak Element Medium

Heap

# Title Solution Difficulty Tag
215 Kth Largest Element in an Array Kth Largest Element in an Array Medium
253 Meeting Rooms II Meeting Rooms II Medium
347 Top K Frequent Elements Top K Frequent Elements Medium Important
373 Find K Pairs with Smallest Sums Find K Pairs with Smallest Sums Medium
378 Kth Smallest Element in a Sorted Matrix Kth Smallest Element in a Sorted Matrix Medium
451 Sort Characters By Frequency Sort Characters By Frequency Medium
692 Top K Frequent Words Top K Frequent Words Medium Important
743 Network Delay Time Network Delay Time Medium Good. Graph + Heap
767 Reorganize String Reorganize String Medium
787 Cheapest Flights Within K Stops Cheapest Flights Within K Stops Medium Good. Graph + Heap
973 K Closest Points to Origin K Closest Points to Origin Medium Good
1046 Last Stone Weight Last Stone Weight Easy
1054 Distant Barcodes Distant Barcodes Medium Similar 767

Backtracking

# Title Solution Difficulty Tag
39 Combination Sum Combination Sum Medium Good
40 Combination Sum II Combination Sum II Medium
46 Permutations Permutations Medium Important
47 Permutations II Permutations II Medium
51 N-Queens N-Queens Hard
52 N-Queens 2 N-Queens Hard

Sliding Window

# Title Solution Difficulty Tag
*** Template Solution
3 Longest Substring Without Repeating Characters Longest Substring Medium
159 Longest Substring with At Most Two Distinct Characters solution Medium Good. Not fix size
209 Minimum Size Subarray Sum Minimum Size Subarray Sum Medium
239 Sliding Window Maximum Solution Hard
340 Longest Substring with At Most K Distinct Characters Solution Hard Similar 159
438 Find All Anagrams in a String Find All Anagrams in a String Medium
567 Permutation in String Permutation in String Medium
713 Subarray Product Less Than K Solution Medium
1004 Max Consecutive Ones III Max Consecutive Ones III Medium
1100 Find K-Length Substrings With No Repeated Characters Solution Medium Good, Fix size
1208 Get Equal Substrings Within Budget Solution Medium Good
1358 Number of Substrings Containing All Three Characters Solution Medium
1438 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Solution Medium Good, Heap + SlidingWindow
1456 Maximum Number of Vowels in a Substring of Given Length Solution Medium
1658 Minimum Operations to Reduce X to Zero Solution Medium

Trie

# Title Solution Difficulty Tag
208 Implement Trie (Prefix Tree) Implement Trie (Prefix Tree) Medium Important
211 Design Add and Search Words Data Structure Design Add and Search Words Data Structure Medium
648 Replace Words Replace Words Medium
676 Implement Magic Dictionary Implement Magic Dictionary Medium
677 Map Sum Pairs Map Sum Pairs Medium
720 Longest Word in Dictionary Longest Word in Dictionary Easy
1023 Camelcase Matching Camelcase Matching Medium
1065 Index Pairs of a String Index Pairs of a String Easy

Graph

# Title Solution Difficulty Tag
207 Course Schedule Course Schedule Medium Topological Sort
210 Course Schedule II Course Schedule II Medium Topological Sort
323 Number of Connected Components in an Undirected Graph Number of Connected Components Medium Important
547 Friend Circles Friend Circles Medium
1462 Course Schedule IV Course Schedule IV Medium Topological Sort
127 Word Ladder Word Ladder Medium

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