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问题 Trying to figure out a way to generate a superset using java need simple answer to what am looking for is Input : ab Output : {} {a} {b} {ab} how do i go about this any clue ? Thanks in advance 回答1: int allMasks = (1 << N); for (int i = 1; i < allMasks; i++) { for (int j = 0; j < N; j++) if ((i & (1 << j)) > 0) //The j-th element is used System.out.print((j + 1) + " "); System.out.println(); } 回答2: Since this is currently the second result in google for java superset I'm going to answer that

问题 I am using Netbeans 7.1 on Ubuntu 11.04. The following call set< Triangle > V; gives the error message error: ‘set’ was not declared in this scope and the following call vector< Triangle > ans; gives the error message error: ‘vector’ was not declared in this scope This despite my having #include <vector> #include <set> #include <map> at the beginning of the C++ file. At help resolving this would be greatly appreciated. Peter. 回答1: you forgot about namespace std : std::set< Triangle > V; std:

问题 I try to make a class containing file names in a folder. But I want it to behave like set. Now I have this: class Files(): def __init__(self, in_dir): self.in_dir = in_dir self.files = set(map(os.path.basename, glob.glob(self.in_dir + "/*.txt"))) def __add__(self, other): return self.files + other.files def __or__(self, other): return self.files | other.files def __and__(self, other): return self.files & other.files def __xor__(self, other): return self.files ^ other.files This work and I can

问题 The title says it all: I am looking for a standard way to preserve Python [frozen]sets in a MySQL database. Note: the SET MySql datatype is not an equivalent; it is more of a multiple-choice from a restricted list object. Note (2): I can invent something ad-hoc; assuming my set is of strings which contain no commas, I can record it as a sorted comma-separated list of strings. I am looking for something which is a bit more general and more standard. Note (3): I have looked at MySQL reference

问题 Given an amount of sets with numbers (0-20 e.g) , we are asked to find the maximum set of numbers from 0-20 that doesn't include any of the given sets(it can include numbers from a set,but not the whole set) For example :Setting the max number 8 and given the sets {1,2} {2,3} {7} {3,4} {5,6,4}, one maximum solution is the set {1, 3, 5, 6, 8}. I was thinking of representing it as a graph and then inducting it to the Max Independent Set problem, but that seems to work only if the sets were

问题 I've been having trouble with this problem. Basically, I have a list of integers, such as list = [1, 2, 3] I want to get all possible permutations of every subset. I know similar questions exist online, but I couldn't find one that does every permutation as well as every subset. In other words, I want: function(list) = [], [1], [2], [3], [1, 2], [2, 1], [1, 3], [3,1], [2, 3], [3,2], [1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1] I understand the output will get extremely

问题 The above shaded area, according to Wolfram is supposed to represent: A XOR B XOR C XOR (A AND B AND C) How to translate this into python code? The code must closely correlate to the set operations as provided in the above expression, at least that is the preference. The code must be generic enough to handle more more than 3 lists as well. UPDATE: Seems like Wolfram is throwing up an erroneous venn diagram? Also, what we actually want is (A XOR B XOR C) - (A AND B AND C) and I am not able to

问题 <form id="myForm" enctype="multipart/form-data" method="POST" onSubmit="return form_submit();"> <input type="file" name="myfile" id="myfile_main" /> </Form> Javascript $("#file_change").change(function(){ var file=this.files; var obj=$.parseJSON(file); alert(JSON.stringify(this.files)); }); I am trying to set values from file multifile input (file_change) to a single file (myfile), my main motive is to select multiple file and upload one by one by self. I am getting error while setting the

问题 I have this query: $result2 = mysql_query("SET @total=0; SELECT *, @total:= @total+ `companyearned` AS `total` FROM `recordedhours` WHERE `group` = '$uid' ORDER BY `unixdate` DESC, `idnum` DESC LIMIT $from, $max_results"); while ($rowb = mysql_fetch_array($result2)) { //DO STUFF } But the SET @total=0; makes the while line give me an error: Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in The query works fine in phpmyadmin and the while works fine

问题 I am getting a variable from $_GET['category'] . This is always supposed to be a integer. So when I set the variable I use: $category=settype($_GET['category'], "int"); // Also tried $category=settype($_GET['category'], "integer"); However, this always returns 1. They are numbers in the query string for example: http://domain.com/example.php?category=57 When I echo $category it always returns 1. No mater what ?category= has behind it for a number. Any help would be appreciated! Thank you! 回答1