Practice

https://cses.fi/problemset/

https://www.codechef.com/

https://codeforces.com/

https://www.hackerrank.com/

Books and Resources

https://cp-algorithms.com/

https://youtu.be/g-1Cn3ccwXY (Rachit jain's video on Standard Template Library which contains implementation of many useful data structures and function that can help in competitive programming)

Dynamic Programming https://www.youtube.com/watch?v=nqowUJzG-iM&list=PL_z_8CaSLPWekqhdCPmFohncHwz8TY2Go

Guide to Competitive Programming_ Learning and Improving Algorithms Through Contests

clrs

Contribution

this respo contains resources for anyone who wanna get started in competitive programming

for contribution mail me haldhardwivedi@gmail.com