time

问题 This is a follow up to a question asked previously (Filter for events that occur within a time range of event "A" in r). Since the original post was answered correctly I decided to start a new question. If this is improper let me know. Quick recap. I have event data with a second value. I wanted to filter all B events that came 5 seconds prior to all A events. The issue I've run into is that the data is split into periods and the seconds restart. I didn't think this would be an issue as the

问题 I can pass in a time to my widget, but my widget is supposed to be instantiating the time in itself, not receiving a DateTime from a parent widget. 回答1: extension CustomizableDateTime on DateTime { static DateTime customTime; static DateTime get current { if (customTime != null) return customTime; else return DateTime.now(); } } Just use CustomizableDateTime.current in the production code. You can modify the returned value in tests like that: CustomizableDateTime.customTime = DateTime.parse(

问题 I want to get a date as string and a language tag and based on that to parse the string by the locale format. This is what I've done so far: public static String formatDateByLocale(String date, String languageTag) { Locale locale = Locale.forLanguageTag(languageTag); String datePattern = DateTimeFormatterBuilder.getLocalizedDateTimePattern(FormatStyle.LONG, FormatStyle.LONG, Chronology.ofLocale(locale), locale); DateTimeFormatter targetFormat = DateTimeFormatter.ofPattern(datePattern)

问题 Here is the code below (ans to a CP qs) The time limit for execution is 6 seconds but my code is slower than. How can I make it more memory and time efficient ? Input: the input begins with the number t of test cases in a single line ( t <= 10 ). In each of the next t lines there are two numbers m and n ( 1 <= m <= n <= 1000000000 , n-m <= 100000 ) separated by a space. Output : for every test case print all prime numbers p such that m <= p <= n , one number per line, test cases separated by

问题 In my Entity i have a field of type LocalDate "day" in MySQL it is mapped to "date" type. MySQL seems to run on UTC SELECT TIMEDIFF(NOW(), UTC_TIMESTAMP); is returning 00:00:00 . My system is running CET (UTC+1) If i query it via sql (console from IntelliJ configured with empty Time zone ) the query select * from table where day = '2020-10-18'; Returns entries with correct date. The query specified with Spring data findByDay is also looking correct: 2020-11-09 16:16:32.911 DEBUG 5600 --- [

问题 What will be the time complexity of this code? for(int i = 1 ; i <= b ; ++i ) for(int j = i ; j <= b ; j += i ) 回答1: You can expand the loops to something like this: i = 1 ——> 1,2,3,…,b b i = 2 ——> 1,3,5,…,b (b/2) i = 3 ——> 1,4,7,…,b (b/3) i = 4 ——> 1,5,9,…,b (b/4) … i = b ——> 1, b (b/b = 1) This expands into a sum of the form: b + b/2 + b/3 + … + b/b = b * (1 + 1/2 + 1/3 + … + 1/b) You might recognize the second factor as the Harmonic Series. Then, using the result from the following SO

问题 What will be the time complexity of this code? for(int i = 1 ; i <= b ; ++i ) for(int j = i ; j <= b ; j += i ) 回答1: You can expand the loops to something like this: i = 1 ——> 1,2,3,…,b b i = 2 ——> 1,3,5,…,b (b/2) i = 3 ——> 1,4,7,…,b (b/3) i = 4 ——> 1,5,9,…,b (b/4) … i = b ——> 1, b (b/b = 1) This expands into a sum of the form: b + b/2 + b/3 + … + b/b = b * (1 + 1/2 + 1/3 + … + 1/b) You might recognize the second factor as the Harmonic Series. Then, using the result from the following SO

问题 I want to write a MIDI file with the inputs I receive from the digital piano I have connected. I am using pygame.midi to open an input port and midiutil to write the MIDI file. What I can't wrap my head around is the timing. For example, in addNote(track, channel, pitch, time, duration, volume) , how do I know what time and duration of a note is? When reading a note, I get pitch and volume just fine, but the others I have no idea... I tried using the timestamp but to no avail, it places the

问题 I want to write a MIDI file with the inputs I receive from the digital piano I have connected. I am using pygame.midi to open an input port and midiutil to write the MIDI file. What I can't wrap my head around is the timing. For example, in addNote(track, channel, pitch, time, duration, volume) , how do I know what time and duration of a note is? When reading a note, I get pitch and volume just fine, but the others I have no idea... I tried using the timestamp but to no avail, it places the

问题 I took this piece from an unencrypted .DAT file: Code: 00 e1 27 17 6f e6 69 c0 Which translates to 63,374,851,375,000,000 in decimal. The units for the number are microseconds. And this huge number cannot bypass the 1st January 1970 00:00:00 format; such a format that most converters use today. So, yes. Is there such a converter that uses the 1st January of the year 1 format? Or how shall I make one? And by the way, a timestamp is both date and time. Thanks in advance! 回答1: You do not say