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90DaysDSA

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Nishant bhaiya's 90DaysDSA challenge.

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# 🛤️ 90 Days of DSA Roadmap

### **Day 1 & 2:** Understanding Space and Time Complexity
The foundation of efficient programming is understanding the complexity of your code.
##### 📚 Resources:
- [Theory](https://www.geeksforgeeks.org/time-complexity-and-space-complexity/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/watch?v=mV3wrLBbuuE) - Kunal Kushwaha

---

### **Day 3 to 10:** Recursion and Backtracking
Master these essential concepts to unlock more advanced problem-solving techniques.
##### 📚 Resources:
- [Theory](https://www.geeksforgeeks.org/introduction-to-backtracking-data-structure-and-algorithm-tutorials/#:~:text=Difference%20between%20Recursion%20and%20Backtracking,best%20result%20for%20the%20problem.) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PL9gnSGHSqcnp39cTyB1dTZ2pJ04Xmdrod) - Kunal Kushwaha

---

### **Day 11 to 30:** Basic Data Structures: Arrays, Linked Lists, Stacks, and Queues
##### 📚 Resources:
#### Arrays:
- [Theory](https://www.geeksforgeeks.org/introduction-to-backtracking-data-structure-and-algorithm-tutorials/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PL9gnSGHSqcnp39cTyB1dTZ2pJ04Xmdrod) - Kunal Kushwaha

#### Linked List:
- [Theory](https://www.tutorialspoint.com/data_structures_algorithms/linked_list_algorithms.htm#:~:text=A%20linked%20list%20is%20a,used%20data%20structure%20after%20array.) - TutorialsPoint
- [Video Lecture](https://www.youtube.com/playlist?list=PLDzeHZWIZsTr54_TH_NK4ibFojS4mmQA6) - Love Babbar

#### Stacks and Queues:
- [Theory](https://www.andrew.cmu.edu/course/15-121/lectures/Stacks%20and%20Queues/Stacks%20and%20Queues.html) - Andrew Edu
- [Video Lecture](https://www.youtube.com/watch?v=rHQI4mrJ3cg) - Kunal Kushwaha

> 💡 *Nishant Chahar's advice:* Start participating in contests and learn new concepts along the way. You may not do well initially, but keep learning and growing!

---

### **Day 31 to 45:** Advanced Data Structures and Algorithms
##### 📚 Topics:
- Searching
- Sorting (Bubble, Insertion, Selection, Merge, Quick)
- Hashmaps
- Trees
- Heaps
- Sliding Window

##### 📚 Resources:
#### Searching:
- [Theory](https://www.geeksforgeeks.org/searching-algorithms/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PLDzeHZWIZsTp4pb_WBRahP1tnipLuX9qM) - CodeHelp by Babbar

#### Sorting:
- [Theory](https://www.geeksforgeeks.org/sorting-algorithms/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PLDzeHZWIZsTp4pb_WBRahP1tnipLuX9qM) - CodeHelp by Babbar

#### Hashmaps:
- [Theory](https://www.geeksforgeeks.org/java-util-hashmap-in-java-with-examples/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/watch?v=7mUKGHznpfg) - CodeHelp by Babbar

#### Trees:
- [Theory](https://www.geeksforgeeks.org/introduction-to-tree-data-structure-and-algorithm-tutorials/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/watch?v=5NiXlPrLslg&list=PLDzeHZWIZsTo87y1ytEAqp7wYlEP3nner) - CodeHelp by Babbar

#### Heaps:
- [Theory](https://www.geeksforgeeks.org/heap-data-structure/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PL_z_8CaSLPWdtY9W22VjnPxG30CXNZpI9) - Aditya Verma

#### Sliding Window:
- [Theory](https://www.geeksforgeeks.org/window-sliding-technique/) - GeeksforGeeks
- [Video Lecture](https://www.youtube.com/playlist?list=PL_z_8CaSLPWeM8BDJmIYDaoQ5zuwyxnfj) - Aditya Verma

---

### **Day 46 to 70:** Dynamic Programming and Graphs
##### 📚 Topics:
- Graph Algorithms: BFS, DFS, Dijkstra, Floyd Warshall, Prim's, Kruskal's, Kosaraju’s, Topological Sort, DSU
- Dynamic Programming

---

### **Day 71 to 80:** Object-Oriented Programming (OOPs)
*Surprise topic — stay tuned!*

---

### **Day 80 to 90:** Additional Advanced Topics
##### 📚 Topics:
- Number Theory
- Bit Manipulation
- Tries

---

90DaysDSA

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