I strongly rely on my "intuition". If my intuition is correct I can solve the problem very fast. Otherwise, I will fall into some solutions that seem right (but actually wrong). The worst thing is debugging takes too much time and upset me (affects other problems). It seems that I am the kind of guy that has strong "thinking inertia". Do you face a similar issue? How to improve? Would you please help me?

Take https://codeforces.net/contest/1779/submission/187786889 as an example. Is it just because I am stupid?