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MONTHLY-CHALLENGES.md

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LeetCode Monthly Challenge Solutions

April 30 Day Challenge

Since I am completing this in May, I could not access the 7th question of each week because it's only for Premium subscribers.

Week 1

Day Name
1 Single Number
2 Happy Number
3 Maximum Subarray
4 Move Zeros
5 Best Time to Buy and Sell Stock II
6 Group Anagrams
7 Counting Elements

Week 2

Day Name
8 Middle of the Linked List
9 Backspace String Compare
10 Min Stack
11 Diameter of Binary Tree
12 Last Stone Weight
13 Contiguous Array
14 Perform String Shifts

Week 3

Day Name
15 Product Of Array Except Self
16 Valid Paranthesis String
17 Number of Islands
18 Minimum Path Sum
19 Search in Rotated Sorted Array
20 Construct Binary Seach Tree from Preorder Traversal
21 Leftmost Column with at Least a One

Week 4

Day Name
22 Subarray Sum Equals K
23 Bitwise AND of Numbers Range
24 LRU Cache
25 Jump Game
26 Longest Common Subsequence
27 Maximal Square
28 First Unique Number

Week 5

Day Name
29 Binary Tree Maximum Path Sum
30 Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree

May Challenge

Week 1

Day Name
1 First Bad Version
2 Jewels and Stones
3 Ransom Note
4 Number Complement
5 First Unique Character in a String
6 Majority ELement
7 Cousins in Binary Tree

Week 2

Day Name
8 Check If It Is a Straight Line
9 Valid Perfect Square
10 Find the Town Judge
11 Flood Fill
12 Single Element in a Sorted Array
13 Remove K Digits
14 Implement Trie

Week 3

Day Name
15 Maximum Sum Circular Subarray
16 Odd Even Linked List
17 Find All Anagrams in a String
18 Permutations in String
19 Online Stock Span
20 Kth Smallest Element in BST
21 Count Square Submatrices with All Ones

Week 4

Day Name
22 Sort Characters By Frequency
23 Interval List Intersections
24 Construct Binary Seach Tree from Preorder Traversal
25 Uncrossed Lines
26 Contiguous Array
27 Possible Bipartition
28 Counting Bits

Week 5

Day Name
29 Course Schedule
30 K Closest Points to Origin
31 Edit Distance

June Challenge

Week 1

Day Name
1 Invert Binary Tree
2 Delete Node in a Linked List
3 Two City Scheduling
4 Reverse String
5 Random Pick with Weight
6 Queue Reconstruction by Height
7 Coin Change 2

Week 2

Day Name
8 Power of Two
9 Is Subsequence
10 Search Insert Position
11 Sort Colors
12 Insert Delete GetRandom O(1)
13 Largest Divisible Subset
14 Cheapest Flights Within K Stops

Week 3

Day Name
15 Search in a Binary Search Tree
16 Validate IP Address
17 Surrounded Regions
18 H-Index II
19 Longest Duplicate Substring
20 Permutation Sequence
21 Dungeon Game

Week 4

Day Name
22 Single Number
23 Count Complete Tree Nodes
24 Unique Binary Search Trees
25 Find the Duplicate Number
26 Sum Root to Leaf Numbers
27 Perfect Squares
28 Reconstruct Itinerary

Week 5

Day Name
29 Unique Paths
30 Word Search II

July Challenge

Week 1

Day Name
1 Arranging Coins
2 Binary Tree Level Order Traversal II
3 Prison Cells After N Days
4 Ugly Number II
5 Hamming Distance
6 Plus One
7 Island Perimeter

Week 2

Day Name
8 3Sum
9 Maximum Width of Binary Tree
10 Flatten a Multilevel Doubly Linked List
11 Subsets
12 Reverse Bits
13 Same Tree
14 Angle Between Hands of a Clock

Week 3

Day Name
15 Reverse Words in a String
16 Pow(x, n)
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