Hi, what are the concepts I should focus on to move to 2 stars and solve more questions in division 4
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1* to 2* are mostly problems related to arrays, like sorting and spotting patterns in a given sequence (letters or numbers). To get 2*, you don’t need rigorous concepts, yet they’d be useful tho (like Time Complexity and Prefix Sum).
As long as you learn to read carefully, come up with your own test cases, debbuging, sorting, and avoiding O(n^2) per test case alhorithms, you should be able to get 2*
Practice is implied. You can do it here with 1000-1400 problems:
Practice Problems (codechef.com)
1000 to 1400 difficulty problems Programming Practice Problem Course Online - CodeChef
You may also want to start practicing Prefix Sum, Data Structures, Algorithms, Number Theory, Bit Manipulation or Binary Search:
Online Coding Practice Problems & Challenges - CodeChef
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Thank you so much, I would keep all these points in mind.
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