𝐃𝐚𝐭𝐚 𝐒𝐭𝐫𝐮𝐜𝐭𝐮𝐫𝐞 𝐑𝐨𝐚𝐝𝐌𝐚𝐩 𝐅𝐢𝐫𝐬𝐭 𝟑𝟎 𝐃𝐚𝐲𝐬

🎯 𝐀𝐫𝐫𝐚𝐲𝐬
📌 Day 1
📔Understand Big O notation (Time and Space complexity)
📌 Day 2
📔Study Basic Concepts of Array and get familiar with List DS in the programming language you chose.
📔 Reverse the array in place (space complexity should be constant)
Input —>> 3,5,9,4,2
Output —>> 2,4,9,5,3
📔 Insert an element in between of array
📌 Day 3 and Day4
📔 Understand Quick Sort, Merge Sort, Insertion Sort and Selection Sort
📔 Implement them all in your fav programming language
📌 Day 5
📔 Understand Binary Search Algorithm
📔 Search an element in Sorted Array
📔 Leetcode Question 33
📔 Leetcode Question 50
📌 Day 6
📔Understand 2D matrix/ @D Arrays
📔Search a 2D Matrix Leetcode question 74
📔 Set Matrix to Zero —> Leetcode 73
📔 Pascals Triangle —> Leetcode 118
📔 Rotate Matrix —> leetcode 48
📌 Day 7
📔 Kadane’s Algo —> Maximum Subbarray Leetcode 73
📔 Sort Array of 0’s 1’s and 2’s Leetcode 75
📔 Two Sum Problem —> Leetcode 1
📔 Find Duplicate
📌 Day 8 —> Level Up
📔Stock Buy and Sell —> Leetcode 121
📔 Next Permutation —> Leetcode 32
📔 Merge Intervals — > Leetcode
📔Merge Sorted Arrays
📌 Day 9 —> Level up
📔Reverse pairs
📔 Grid Unique Paths
📔 3 Sum problem
📔 4 Sum Problem
📌 Day 10
📔Repeat Missing Number Array
📔 Reverse Pairs
📔 Longest Consecutive Subsequence
📔 Subarray with given Xor
📔 Longest Substring without repeat
𝐋𝐢𝐧𝐤𝐞𝐝𝐋𝐢𝐬𝐭
📌 Day 11
📔Understand the concept of Linked List
📔Understand its Advantages and disadvantages over Arrays
📔Implement Linked list in the language you chose:
📔Create Linked List class
📔Create a Node
📔Add Node
📔Remove Node
📔Find Node in Linked List
📌 Day 12
📔Reverse Linked List
📔Find Middle of the Linked List
📔Remove Nth Node From End of List
📔Merge Two Sorted Lists
📌 Day 13
📔Add Two Numbers given in linked list
📔Detect and remove Linked List Cycle
📔Intersection of Two Linked Lists
📔Palindrome Linked List
📌 Day 14
📔Reverse Nodes in k-Group
📔Rotate List
📔Flattening a Linked List
📔Copy List with Random Pointer
𝐒𝐓𝐀𝐂𝐊
📌 Day 15
📔Understand the basics of Stack Data Structures
📔Relate with some real life examples like
📔Stack of Note books and Stack of coins
📔Implement the Stack using Arrays (Push Pop etc functionalities )
📔Implement the Stack with Linked List

📌 Day 16
📔Sort a Stack
📔Valid Paranthesis: Leetcode 20
📔Retrieve Minimum Element from the Stack Leetcode 155
📌 Day 17 (Level Up)
📔Next Greater Element using Stack Leetcode 496
📔Find largest rectangle in Histogram Leetcode 84
𝐐𝐔𝐄𝐔𝐄
📌 𝐃𝐚𝐲 18
📔 Understand the basics of Queue Data Structures
📔 Relate with some real life examples
📔 Implement the Queue using Arrays
📔 Implement the Queue using Linked List

📌 𝐃𝐚𝐲 19
📔 Implement Queue using Stack
📔 Implement Stack using Queue
📔 Implement and understand Double Ended Queue
📌 𝐃𝐚𝐲 20
📔 Understand and Implement Circular Queue
📔 Fine examples where circular Queues can be used.
📔 Implement Producer Consumer Problem
📌 𝐃𝐚𝐲 21
📔 Queue Reversal
📔 Implement LRU Cache
📔 Implement LFU Cache
📌 𝐃𝐚𝐲 22
📔 Learn Sliding window Coding Pattern
📔 Sliding Window Maximum Leetcode 239
📔 First negative integer in every window of size
📌 𝐃𝐚𝐲 23
📔 Trapping Rain Water (Stack based) Leetcode 42
📔 Simplify Directory Path (Stack Based) Leetcode 71
(No Priority Queue for now)

𝐑𝐞𝐜𝐮𝐫𝐬𝐢𝐨𝐧
📌 𝐃𝐚𝐲 24
📔Understand Recursion and its base conditions etc.
📔Understand in depth not only what recursion is but also what kind of Data str it uses internally etc.
You will get to know how stackoverflow error occurs
📌 𝐃𝐚𝐲 25
📔Fibonacci Number
📔Reverse the Linked List using Recursive approach
📔Reverse linkedList in k-groups
📌 𝐃𝐚𝐲 26
📔Subset Sums
📔Subsets II
📌 𝐃𝐚𝐲 27 (Level up questions)
📔Combination Sum
📔Combination Sum II
📔Palindrome Partitioning
vPermutation Sequence
Revision
📌Day 28-30
Revise Arrays, Linked List, Queues, Stacks and Recursion