compare

问题 You can pass a function pointer, function object (or boost lambda) to std::sort to define a strict weak ordering of the elements of the container you want sorted. However, sometimes (enough that I've hit this several times), you want to be able to chain "primitive" comparisons. A trivial example would be if you were sorting a collection of objects that represent contact data. Sometimes you will want to sort by last name, first name, area code . Other times first name, last name - yet other

问题 I’m trying to compare two dates in Android but im getting this when I write this SimpleDateFormat sdf = new SimpleDateFormat("ddMMyyyy"); String valid_until = "26052018"; final Date strDate = sdf.parse(valid_until); and if I put the try and catch like this I can’t compare the date because it says I didn't declared strDate . 回答1: SimpleDateFormat is a concrete class for formatting and parsing dates in a locale-sensitive manner. It allows for formatting (date → text), parsing (text → date), and

问题 I searched this site for my question, but I didn't find a solution to my problem. The system gives a random number for the player and for the computer, from 2 to 12. This has 3 parts, if X bigger than Y, if X lesser than Y, and when X is same as Y. When I start the .bat , it works great, I choose Play Game , I enter the Bet (20 for example), but when I start this process, the window closes, and I can't read what it wrote. I can see some flashing text, I have seen 'Your' and 'syntax', but it

问题 I have this code that works great and does what I want, however it does it in linear form which is way to slow for the size of my data files so I want to convert it to Log. I tried this code and many others posted here but still no luck at getting it to work. I will post both sets of code and give examples of what I expect. import pandas import fileinput '''This code runs fine and does what I expect removing duplicates from big file that are in small file, however it is a linear function.'''

问题 Consider this enum: enum DataType { case One (data: Int) case Two (value: String) } Swift has pattern matching to compare an enum with associated values, like so: let var1 = DataType.One(data: 123) let var2 = DataType.One(data: 456) if case DataType.One(data: _) = var2 { print ("var2 is DataType.One") } How would one go about comparing not one variable against an enum type, but comparing the enum type of two variables? I saw a ton of similar questions, but none focused on the case where you

问题 I have 2 table I select and count compare item form 2 tables, also after compare I need to compute how many item contain in other table. select results.userid, results.amount, results.type, results.counting from (SELECT userid, amount, code, count(*) as counting FROM user_buys join star ON (amount >= min_amount) group by type HAVING amount >= 1000) as results with table below userid |amount ---------------------- 1 | 1000 2 | 2000 3 | 5500 4 | 8200 5 | 200 6 | 1500 7 | 800 I need to sync with

问题 I have a class A: class A { var identifier: String? var quantity: Int = 0 } Two arrays of A instances: var array1: [A] = [a1, a2, a3, a4] var array2: [A] = [a5, a6, a7, a8] I don't know which is the best way to check: array1==array2 if a1.identifier == a5.identifier, a2.identifier == a6.identifier, a3.identifier==a7.identifier, a4.identifier==a8.identifier in Swift. Please help me... 回答1: You can try like this: let result = zip(array1, array2).enumerated().filter() { $1.0 == $1.1 }.map{$0.0}

问题 I'm aiming to write a script that will compare each line within a file, and based upon this comparison, create a new file containing the lines of text which aren't in the second file. For example; **File 1:** Bob:20 Dan:50 Brad:34 Emma:32 Anne:43 **File 2:** Dan:50 Emma:32 Anne:43 The new output (File 3): Bob:20 Brad:34 I have some idea of how this needs to be done, but not exactly: def compare(File1,File2): with open(File1, "a") as f1: lines = f1.readlines() string = line.split(':') with

问题 I have already tried all options that I found online to solve my issue but without good result. Basically I have two csv files (pipe separated): file1.csv: 123|21|0452|IE|IE|1|MAYOBAN|BRIN|OFFICE|STREET|MAIN STREET|MAYOBAN| 123|21|0453|IE|IE|1|CORKKIN|ROBERT|SURNAME|CORK|APTS|CORKKIN| 123|21|0452|IE|IE|1|CORKCOR|NAME|HARRINGTON|DUBLIN|STREET|CORKCOR| file2.csv: MAYOBAN|BANGOR|2400 MAYOBEL|BELLAVARY|2400 CORKKIN|KINSALE|2200 CORKCOR|CORK|2200 DUBLD11|DUBLIN 11|2100 I need a linux bash script

问题 I have the following two arrays: $array_one = array('colorZero'=>'black', 'colorOne'=>'red', 'colorTwo'=>'green', 'colorThree'=>'blue', 'colorFour'=>'purple', 'colorFive'=>'golden'); $array_two = array('colorOne', 'colorTwo', 'colorThree'); I want an array from $array_one which only contains the key-value pairs whose keys are members of $array_two (either by making a new array or removing the rest of the elements from $array_one ) How can I do that? I looked into array_diff and array