The key is mentality... Second, experience ......

I thought it would be troublesome to read the calendar yesterday... I used to take the C ++ test in the past, but the test was poor-I forgot that my skills were weak at that time.

So I did not do it after the press. Today I wrote it for 20 minutes. If I did it yesterday, it would be okay for more than half an hour ......

Also, the first method -- use sort + binary_search to check whether it is long.CodeI really don't want to write it again from the ground up with map ......
I just want to use the optimization algorithm-inline or something, but I got nothing. Today I use map to rewrite it-4453 (msel) too-that is even slower ............

Try again later ......