Chong Wang

I have been doing 51nod for a long time, because in the early days I always liked to read the solutions and missed a lot of good questions. Now that I think about it, I want to give myself a few slaps. The important thing is never whether you can solve the problem, but how to think about it. Many of the questions here are good, and I want to record them here.

The song “Time Travel” in my headphones is wonderful.

A.Yesterday is history. Tomorrow is a mystery. Today is a gift. That’s why it is called the present.

It seems that I need more practice.

I originally planned to write a monthly recap, but later decided it might be too sentimental and stopped. By coincidence, I wrote recaps in July in both 2015 and 2016. The 2016 one was so bare-bones; the 2015 one was so honest.

Maybe it’s because of my recent internship, maybe not (then why do you say it)… Maybe it’s just because I’m lazy… I’ve done very few questions recently, but it feels like… I’ve reached some critical periods again (…), so I still need to do it, and then I find that my low IQ seems to have been cleared recently…

I have been thinking about questions E and F for a long time this time. I particularly like AtCoder’s messy questions because… I often can’t do it… (spreads hands and smiles bitterly)

My gaps in knowledge have become unbearable. I need to review my understanding of several concepts seriously, from the beginning.

Until I make these ideas clear, I cannot work on other things with peace of mind. Why am I so weak at this?

Problem link

Problem link

Title link

You still need to immerse yourself in it. C, D, and E are all good questions. The DP for E question should be figured out. What’s going on?