i participate the starters coding contest regularly but i cant able to solve more than first three problems why
The “you need to practice” would be an obvious answer lol
You need to learn Data Structures (list, queues, hash, etc), and Algorithms (Binary Search, QuickSort, etc). Those are the minimum. You can learn from exercises here or in CodeForces.
Online Coding Practice Problems & Challenges - CodeChef
Practice Problems (codechef.com)
Then, you should learn some particular techniques, like PrefixSum, Bit Manipulation, etc. Those can be learn in the same sources.
Finally, you should practice all of them a lot, to make your mind react almost instantly to identify what kind of problem it is. Today’s problems required sorting, bit manipulation, prefix sum (those were the topics I identified. There were possibly more)