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June LeetCode Challenge

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1. Invert Binary Tree
1. Invert Binary Tree
 
 
10. Search Insert at Position
10. Search Insert at Position
 
 
11. Sort Colors
11. Sort Colors
 
 
12. Insert Delete GetRandom O(1)
12. Insert Delete GetRandom O(1)
 
 
13. Largest Divisible Subset
13. Largest Divisible Subset
 
 
14. Cheapest Flights Within K Stops
14. Cheapest Flights Within K Stops
 
 
15. Search in a Binary Search Tree
15. Search in a Binary Search Tree
 
 
16. Validate IP Address
16. Validate IP Address
 
 
17. Surrounded Regions
17. Surrounded Regions
 
 
18. H Index - II
18. H Index - II
 
 
19. Longest Duplicate Substring
19. Longest Duplicate Substring
 
 
2. Delete Node in a Linked List
2. Delete Node in a Linked List
 
 
20. Permutation Sequence
20. Permutation Sequence
 
 
21. Dungeon Game
21. Dungeon Game
 
 
22. Single Numeber II
22. Single Numeber II
 
 
23. Count Complete Tree Nodes
23. Count Complete Tree Nodes
 
 
24. Unique Binary Search Trees
24. Unique Binary Search Trees
 
 
25. Find the Duplicate Number
25. Find the Duplicate Number
 
 
26. Sum Root to Leaf Numbers
26. Sum Root to Leaf Numbers
 
 
27. Perfect Squares
27. Perfect Squares
 
 
28. Reconstruct Itinerary
28. Reconstruct Itinerary
 
 
29. Unique Paths
29. Unique Paths
 
 
3. Two City Scheduling
3. Two City Scheduling
 
 
30. Word Search II
30. Word Search II
 
 
4. Reverse String
4. Reverse String
 
 
5. Random Pick by Weight
5. Random Pick by Weight
 
 
6. Queue Reconstuction by Height
6. Queue Reconstuction by Height
 
 
7. Coin Change 2
7. Coin Change 2
 
 
8. Power of 2
8. Power of 2
 
 
9. Is Subsequence
9. Is Subsequence
 
 
readme.md
readme.md
 
 

readme.md

Programs       Easy       Medium       Hard      

LeetCode June Challenge 2020

# Problem Statement Solution Related Topics Difficulty
Day 1 Invert Binary Tree View Tree Easy
Day 2 Delete Node in a Linked List View Linked List Easy
Day 3 Two City Scheduling View Greedy Easy
Day 4 Reverse String View Two Pointers, String Easy
Day 5 Random Pick with Weight View Binary Search, Random Medium
Day 6 Queue Reconstruction by Height View Greedy Medium
Day 7 Coin Change 2 View DP Medium
Day 8 Power of Two View Math, Bit Manipulation Easy
Day 9 Is Subsequence View Binary Search, DP, Greedy Easy
Day 10 Search Insert Position View Array, Binary Search Easy
Day 11 Sort Colors View Array, Two Pointers, Sort Medium
Day 12 Insert Delete GetRandom O(1) View Array, HashTable Medium
Day 13 Largest Divisible Subset View Math, DP Medium
Day 14 Cheapest Flights Within K Stops View DP, Heap, BFS Medium
Day 15 Search in a Binary Search Tree View Tree Easy
Day 16 Validate IP Address View String Medium
Day 17 Surrounded Regions View BFS, DFS Medium
Day 18 H-Index II View Binary Search Medium
Day 19 Longest Duplicate Substring View Hash Table, Binary Search Hard
Day 20 Permutation Sequence View Math, Backtracking Medium
Day 21 Dungeon Game View Binary Search, DP Hard
Day 22 Single Numeber II View Bit Manipulation Medium
Day 23 Count Complete Tree Nodes View Binary Search, Tree Medium
Day 24 Unique Binary Search Trees View DP, Tree Medium
Day 25 Find the Duplicate Number View Two Pointers, Binary Search Medium
Day 26 Sum Root to Leaf Numbers View Tree, DFS Medium
Day 27 Perfect Squares View Math, DP, BFS Medium
Day 28 Reconstruct Itinerary View DFS, Graph Medium
Day 29 Unique Paths View Array, DP Medium
Day 30 Word Search II View Backtracking, Trie Hard