I have been devoting into competitive programming since the beginning of this year. In the first 3 months, I learned several basic algorithm in CP (of course, I solved so many questions during this period). Later, I heard that a website named "codeforces" is very good for CPer, so I registered this account. To be honest, my programming skill improved a lot during last several months. However, I feel that it's difficult for me to improve my rating now. I have been cyan color for about 50 days and it's hard for me to become blue color. Actually, I practiced very hard during this summer vacation, but my rating improvement didn't achieve my expectancy. Yesterday, I took part in Codeforces Round 972 and I haven't got enough time to solve 2005C - Lazy Narek, although I came up with it (I failed to finish my code in last 40 minutes in the contest). I really want to participate in ICPC on behalf of BUPT next year, and I know that there is a long way to go for me. I have to improve my rating. How can I do it more quickly?