How to become competitive coder?

Answer 1

https://www.sololearn.com/Discuss/437973/?ref=app
This may be helpful.

Answer 2

Learn data structure deeply and you have to learn basics of language . firstly you have to decide in which language u want to solve problems. And focus in only one Programming language.

You need to know:
Sort and Search algorithms
Hashing
Number Theory
Greedy Technique

please read this post here some useful tips for competitive programing.
https://medium.com/@andreimargeloiu/how-to-prepare-for-competitive-programming-396d557e0c12