I see a lot of coding contests hosted in lots of sites like,codeforces,codechef,Atcoder,etc. But what i need is online Math contests where a person solves math problems and can look for the editorial for learning new techniques just like coding contests. Are there any possible sites available for Math contests??
what you are looking for is unnecessary + inefficient
Maybe you are right, it may be unnecessary and inefficient but nowadays I am beginning to respect math a lot. even if it is taking time for me to come up solution using a particular approach but it is always cool for a beginner like me to try and come up with mathematical framework.
There is a Bangladeshi site called "gonitzoggo". It is as you mentioned. There is also an English version of the problems(maybe for all).
https://gonitzoggo.com/
project euler