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问题 This is the code: struct comp { bool operator()(Reputation *one, Reputation *two) { if (one->Amount < 0 && two->Amount >= 0) return false; if (one->Amount >= 0 && two->Amount < 0) return true; if (one->Amount >= 0) return one->Amount <= two->Amount; else return one->Amount >= two->Amount; } }; And this is the problem: Debug Assertion Failed! File: ..\VC\include\xtree Line: 638 Expression: invalid operator< After that, I can choose "Abort", "Retry" or "Ignore". If I choose ignore many more

问题 Hi I would like to implement an efficient algorithm to handle the following case: Lets assume we have 2 lists with the following elements: Source: [a,b,c,d,e] New: [d,e,f,g] Now I have to update source with the new information. The algorithm should be able to find that 'f' and 'g' are new entries, that 'a', 'b' and 'c' has been removed and that 'd' and 'e' have not being modified. The operations involved are set-intersect operations between Source and New, and viceversa. I am looking for an

问题 Consider a sequence of sets: >>> [{n, 2*n} for n in range(5)] [{0}, {1, 2}, {2, 4}, {3, 6}, {8, 4}] Passing them directly into the union method yields the correct result: >>> set().union({0}, {1, 2}, {2, 4}, {3, 6}, {8, 4}) {0, 1, 2, 3, 4, 6, 8} But passing them as a list or generator expression results in a TypeError: >>> set().union( [{n, 2*n} for n in range(5)] ) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unhashable type: 'set' >>> set().union({n, 2*n

问题 I have n elements in a set U (lets assume represented by an array of size n). I want to find all possible ways of dividing the set U into two sets A and B, where |A| + |B| = n. So for example, if U = {a,b,c,d}, the combinations would be: A = {a} -- B = {b,c,d} A = {b} -- B = {a,c,d} A = {c} -- B = {a,b,d} A = {d} -- B = {a,b,c} A = {a,b} -- B = {c,d} A = {a,c} -- B = {b,d} A = {a,d} -- B = {b,c} Note that the following two cases are considered equal and only one should be computed: Case 1: A

问题 I am writing a Java program in which I need to search a particular word from a Set. The word that has to be searched is something like ("wo.d") where '.' can be replaced by any other alphabet. I am using regex to match such type of word cases. This is what I have so far HashSet<String> words = new HashSet<String>();//this set is already populated String word = "t.st"; if(word.contains(".")){ Pattern p = Pattern.compile(word); Matcher m; boolean match = false; for(String setWord : words){ m =

问题 I want to have this kind of result in a DOS batch: ==> Please enter your filename, formatted as [user][PC_id] : allowing the user to enter the filename after the ":" I tried a lot of combinations, but the best I can get it with ECHO --^> Please enter your filename, formatted as Set /P FILE=[user][PC_id] : (blank spaces before "[" are not displayed) 回答1: You have problems with a feature introduced in Vista/Win7. It strips all whitespace characters in front of a string, when using set/p . But

问题 In F#, you can generate a set of numbers, just by saying [1..100]. I want to do something similar in C#. This is what I have come up with so far: public static int[] To(this int start, int end) { var result = new List<int>(); for(int i = start; i <= end; i++) result.Add(i); return result.ToArray(); } By doing this, I can now create a set by saying 1.To(100) Unfortunately, this is not nearly as readable as [1..100]. Has anyone come up with a better way to do this in C#? Is it more readable if

问题 I am writing a program to assist with a trivial part of my job that can be automated. My purpose here is to: Copy and paste a chunk of plain text into a Tkinter text widget Use that pasted chunk of text as the value of a variable so that the variable can have certain characters pulled and returned down the line. I have a functioning little bit of code. For example, here is my text widget and the lines of code I use to get and print its contents: textBox = Text(root) textBox.focus_set() def

问题 {x for x in range(10)} works perfectly on IDLE, but when I try this in eclipse (with Pydev plugin) I get a syntax error: Undefined variable: x Is it because Pydev doesn't support set comprehensions or something? What can I do to make this work? (This was just one example that doesn't work. All set comprehensions don't work for me). (I'm using Python 3) 回答1: This is a bug in PyDev; in this case ignore the editor's warning and execute the code: it will work. I get this a lot, PyDev isn't

问题 I'd like to calculate a hash of a set of strings in Java. Yes I can sort the strings and calculate the MD5 hash iterative using digest.update . But I'd prefer to omit the sort and use something like combineUnordered https://github.com/google/guava/wiki/HashingExplained There is a lot of similar question asking the same such as Order-independant Hash Algorithm but non of them provides a simple example showing how to calculate iterative an order independent hash in Java. 回答1: Just XOR each hash