Never Stop Upsolving
Even if it takes you 7 years to upsolve a problem, there is no point in not doing it eventually.
This was taken from my attempt at solving 837E - Vasya's Function as I was reviewing problems for my students.
Random Div. 2 Problem-Solving
2nd Universal Cup Summer Summit
Codeforces Round 954 Div 3 Solution Discussion (with Shayan)