I can't even solve 800 rated problems or div2 A problems. Problems like this https://codeforces.net/problemset/problem/1705/B and this https://codeforces.net/problemset/problem/1714/A.I can't even think how to approach the problems. How can i overcome this ?.It is very disheartening to not being able to solve even 800 Rated problem.In contest i just stare at the first problem.And can't even think what should i do?Please help i want to improve.