🪐 Leetcode DS & Algo Resources

🎯 𝐃𝐮𝐬 𝐃𝐢𝐧 𝐀𝐫𝐫𝐚𝐲𝐬 𝐈𝐧 (10 𝐃𝐚𝐲𝐬 𝐑𝐨𝐚𝐝𝐦𝐚𝐩 𝐏𝐥𝐚𝐧 𝐟𝐨𝐫 𝐌𝐚𝐬𝐭𝐞𝐫𝐢𝐧𝐠 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 —> https://lnkd.in/dcXDGjJb 📔 Leetcode Question 50 —> https://lnkd.in/d8XnAp22 📌 Day 6 📔Understand 2D matrix/ @D Arrays 📔Search a 2D Matrix Leetcode question 74 --> https://lnkd.in/db7cGdez 📔 Set Matrix to Zero —> Leetcode 73 —> https://lnkd.in/dV3gUPEf 📔 Pascals Triangle —> Leetcode 118 —> https://lnkd.in/dCrmGNby 📔 Rotate Matrix —> leetcode 48 —> https://lnkd.in/d7wkU8UV 📌 Day 7  📔 Kadane’s Algo —> Maximum Subbarray Leetcode 73 —> https://lnkd.in/dJ2X9gzw 📔 Sort Array of 0’s 1’s and 2’s Leetcode 75. —> https://lnkd.in/dNWw6Bp8 📔 Two Sum Problem —> Leetcode 1 —> https://lnkd.in/dqsSyqBB 📔 Find Duplicate —> https://lnkd.in/dMdz7KXq 📌 Day 8 —> Level Up 📔Stock Buy and Sell —> Leetcode 121 —> https://lnkd.in/dGv_8HUE 📔 Next Permutation —> Leetcode 32 —> https://lnkd.in/dNfymKti 📔 Merge Intervals — > Leetcode —> https://lnkd.in/dxbbt7wF 📔Merge Sorted Arrays —> https://lnkd.in/dNzpA3eU 📌 Day 9 —> Level up 📔Reverse pairs —> https://lnkd.in/d7erN9PU 📔 Grid Unique Paths —> https://lnkd.in/dUS3mxaS 📔 3 Sum problem --> https://lnkd.in/djjGS4ep 📔 4 Sum Problem —> https://lnkd.in/dtKJ-a5K 📌 Day 10 📔Repeat Missing Number Array —> https://lnkd.in/d4C26Bn8 📔 Reverse Pairs —> https://lnkd.in/d7erN9PU 📔 Longest Consecutive Subsequence —> https://lnkd.in/d-PBiptg 📔 Subarray with given Xor —>https://lnkd.in/dzCVTG_x 📔 Longest Substring without repeat —> https://lnkd.in/dtMzQbaf

"Top LeetCode posts that you cannot miss" 1) For Online Assessment + Phone Screen + Onsite Rounds: - https://lnkd.in/dXB7xbsc - https://lnkd.in/dhgnCHDh - https://lnkd.in/dV65F9s2 - https://lnkd.in/dmMsTEXb - https://lnkd.in/dyCbzm7P - https://lnkd.in/dvPHRbi3 - https://lnkd.in/d5C5AfDB 2) For Behavioural Rounds: - https://lnkd.in/daWKBYxu - https://lnkd.in/d2VThaPC - https://lnkd.in/dUAGGSRg - https://lnkd.in/dV9kQ2e9 - https://lnkd.in/dRsXPyfW 3) Top Interview Experiences to go through: - https://lnkd.in/d5THPkkW - https://lnkd.in/d9cTpYKE - https://lnkd.in/dcAdcben - https://lnkd.in/dhFyWtEf - https://leetcode.com/discuss/interview-experience/776280/Google-or-L3-or-Bangalore-or-July-2020-Offer - https://leetcode.com/discuss/interview-experience/455354/Give-Away-Mistakes-i-did-in-interview-and-which-should-be-avoided. - https://leetcode.com/discuss/interview-experience/646712/FAANG-Struggle-to-Offer-Amazon-or-SDE2-or-Seattle-or-May-2020-Offer 4) Some Strategies To Follow: - https://leetcode.com/discuss/study-guide/698684/Interview-Preparation-for-Beginners-DS-or-Algorithms-or-OS-or-System-Design - https://leetcode.com/discuss/study-guide/1177039/%22Practice-More-Learn-More%22-greater-Study-Guide-and-Interview-Preparation-Using-LEETCODE - https://leetcode.com/discuss/study-guide/623011/A-guide-for-dummies-(like-me) - https://leetcode.com/discuss/study-guide/2009997/How-to-get-started-with-DSA-and-practice-Leetcode-Efficiently

Next topic : TWO POINTERS Resource video : https://youtu.be/2wVjt3yhGwg How to identify problems that involves this technique? Two Pointers Pattern Two Pointers is a pattern where two pointers iterate through the data structure in tandem until one or both of the pointers hit a certain condition. Two Pointers is often useful when searching pairs in a sorted array or linked list; for example, when you have to compare each element of an array to its other elements. How To Identify - It will feature problems where you deal with sorted arrays (or Linked Lists) and need to find a set of elements that fulfill certain constraints - The set of elements in the array is a pair, a triplet, or even a subarray Questions - Squaring a sorted array (easy) - Triplets that sum to zero (medium) - Comparing strings that contain backspaces (medium) ————————————————- Fast and Slow pointers The Fast and Slow pointer approach, also known as the Hare & Tortoise algorithm, is a pointer algorithm that uses two pointers which move through the array (or sequence/linked list) at different speeds. This approach is quite useful when dealing with cyclic linked lists or arrays. By moving at different speeds (say, in a cyclic linked list), the algorithm proves that the two pointers are bound to meet. The fast pointer should catch the slow pointer once both the pointers are in a cyclic loop. How To Identify - The problem will deal with a loop in a linked list or array - When you need to know the position of a certain element or the overall length of the linked list Questions - Linked List Cycle (easy) - Palindrome Linked List (medium) - Cycle in a Circular Array (hard) Next topic : SLIDING WINDOW, will be shared after 2 days.

Hashing problems to solve: https://leetcode.com/problems/two-sum/ https://leetcode.com/problems/intersection-of-two-arrays/ https://www.geeksforgeeks.org/counting-frequencies-of-array-elements/?ref=lbp https://www.geeksforgeeks.org/find-whether-an-array-is-subset-of-another-array-set-1/ https://www.geeksforgeeks.org/maximum-distance-two-occurrences-element-array/

DAY-2, Problem Solving on HASHING. Read and solve problems from this for today (easy ones) : https://leetcode.com/explore/learn/card/hash-table/ For the implementation of Hashmap in the deeper way, check out this: Java - https://youtu.be/2ijH5vcKIxQ C++ - https://youtu.be/7mUKGHznpfg Tomorrow I will share some important problems to solve from GFG and LEETCODE. Stay consistent and Happy Coding.🤓

75 Leetcode Must-know questions. The below Leetcode questions are so… | by Mini Chang | Medium https://medium.com/@miniChang8/75-leetcode-must-know-questions-953b3749c7e9

Some Hashing resources : https://medium.com/basecs/taking-hash-tables-off-the-shelf-139cbf4752f0 https://medium.com/basecs/hashing-out-hash-functions-ea5dd8beb4dd