30DaysOfLeetcode

July Leetcoding Challenge

• Remove Linked List Elements
• Word Search
• Binary Tree Zigzag Level Order Traversal

Here I will be solving 30 leetcode problems in 30 days using Java

Day 1

• 589. N-ary Tree Preorder Traversal : Solution

Day 2

• 590. N-ary Tree Postorder Traversal : Solution
• 145. Binary Tree Postorder Traversal : Solution

Day 3

• 169. Majority Element : Solution
• 203. Remove Linked List Elements : Solution

Day 4

• 297. Serialize and Deserialize Binary Tree : Solution

Day 5

• 78. Subsets : Solution

Day 6

• 90. Subsets II : Solution

Day 7

• 1352. Product of the Last K Numbers : Solution
• 153. Find Minimum in Rotated Sorted Array : Solution
• 154. Find Minimum in Rotated Sorted Array II : Solution

Day 8

• 1007. Minimum Domino Rotations For Equal Row : Solution

Day 9

• 238. Product of Array Except Self : Solution
• 19. Remove Nth Node From End of List : Solution
• 430. Flatten a Multilevel Doubly Linked List : Solution

Day 10

• 122. Best Time to Buy and Sell Stock II : Solution

Day 11

• 121. Best Time to Buy and Sell Stock : Solution

Day 12

• 268. Missing Number : Solution
• 448. Find All Numbers Disappeared in an Array : Solution
• 41. First Missing Positive : Solution

Day 13

• 46. Permutations : Solution

Day 14

• 929. Unique Email Addresses : Solution
• 1146. Snapshot Array : Solution

Day 15

• 416. Partition Equal Subset Sum : Solution

Day 16

• Google | OA 2018 | Min Abs Difference of Server Loads : Solution

Day 17

• 70. Climbing Stairs : Solution
• 125. Valid Palindrome : Solution
• 328. Odd Even Linked List : Solution

Day 18

• 494. Target Sum : Solution

Day 19

• 518. Coin Change 2 : Solution

Day 20

• 811. Subdomain Visit Count : Solution

Day 21

• 136. Single Number : Solution

Day 22

• 298. Binary Tree Longest Consecutive Sequence : Solution

Day 23

• 200. Number of Islands : Solution

Day 24

• 130. Surrounded Regions : Solution

Day 25

• 286. Walls and Gates : Solution
• 994. Rotting Oranges : Solution

Day 26

• 2. Add Two Numbers : Solution

Day 27

• 215. Kth Largest Element in an Array : Solution
• 973. K Closest Points to Origin : Solution

Day 28

• 937. Reorder Data in Log Files : Solution
• 819. Most Common Word : Solution

Day 29

• 100. Same Tree : Solution
• 572. Subtree of Another Tree : Solution

Day 30

• 21. Merge Two Sorted Lists : Solution