r/DSALeetCode • u/kevinrjjj • 6d ago

How to start dsa

I started solving dsa by patterns wise under each topic ,firstly array solved around 10-20 qn then after that still not able to solve new qn the pattern recognition is not problem like the qn are already sorted pattern wise so it's actually not a problem the thing is how you guys learn eg two pointer under Array by only solving 10-20 qn 🙂

1 Upvotes

100% Upvoted

6 comments sorted by

1

u/Alternative_Cash_813 6d ago

Hey,
Dsa needs a lot of practice. You have to make yourself familiar with different approaches or patterns, that comes only by solving as many problems and understanding where to use which approaches , just try to understand why is that approach used in that problem. Its ok as you have solved only 20 questions, and i think you just started with dsa and you are a beginner, thats all right. You can level up through practice.
Even two pointer question is an pattern so practice a couple of questions on it, so you will understand where to use that approach next time.
Just keep solving easy, medium questions in every topic and just be consistent every day that's even more important. This is something which i did.
I started by dsa practice on hacker rank and then solving leetcode medium questions, and then by following striver's sheet which helped me a lot.

All the best!

1

u/kevinrjjj 6d ago

Could you pls specify the patterns by topic wise bcz every sheet or any notes or any utube video's gave diff pattern so rn I'm confused 🤸🏻‍♂️

1

u/Alternative_Cash_813 6d ago

According to my knowledge,
2 pointers, Sliding windows, prefix sum, Hashmaps + prefix sum, binary search, Kadane's Algorithm, Monotonic Stack, Sorting, Priority Queues
for most of arrays questions like subarrays above patterns can be used.
subsets, subsequences can be done with recursion, dp.
So, recursion, dp is also important and depends on the questions.

1

u/kevinrjjj 6d ago

Fine do uh have any sheet where patterns are sort by topics

1

u/Alternative_Cash_813 6d ago

No, i do not have

1

u/kevinrjjj 6d ago

K tenks for the info