A high schooler who posts some pretty amazing videos on him solving problems from Google kickstart, and codeforces. He is amazing to watch and I think his videos have good value as a learning resource. A little different from leetcode style problems but I figured people here might be interested. Youtube: https://www.youtube.com/channel/UCKuDLsO0Wwef53qdHPjbU2Q/featured
Someone even made a fan page for this guy! I guess William deserves it http://tmworz.cf/