java - More efficient way to find all combinations? -

-

Say that you have list 's strings or whatever , And you want to create another list which will include every possible combination of two strings from the original list (together Presented), is there any more efficient way to combine the string with all others to do this besides using the nested for loop?

Some sample code: 

 for  (string s: bytes) {for (string a: bytes) {if (! (Bytes. Index (a) == Bytes .indexOf (s)) {if (s.concat (a) .length () == targetLength) {string combination = s.concat (a); ValidSolutions.add (combination); }}}}   
 The time for performance is badly damaged because the size of the original  list  of  strings  increases.  
 Is there a more efficient way to do this?   
 
 
 You  I! By setting J = j  condition  j = i + 1 . Also,  bytes. Things like length ()  are evaluated on each iteration of both ends - save it to a value and reuse. Calling inside the loop  a.length ()  often asks for the length of the same string - you can also save some runtime on it. These are the updates:  
 < Code> int len ​​= bytes.length (); Int aLength; String A, B; {A = bytes [i] for (int i = 0; i & lt; len; i ++); AL & D = Aline (); For (int j = i; j & lt; lane; j ++) {b = bytes [ja]; If (b long () + alndt == target lang) {legitimate solutions.ed (b. Conct (a)); ValidSolutions.add (a.concat (b)); }}}   
 Edit:  j = i  Because you want to consider combining the string with yourself; In addition, you will need to add  a.concat (b)  since this combination is never considered in the loop, but it is a valid string

Comments

Post a Comment

Popular posts from this blog

mysql - BLOB/TEXT column 'value' used in key specification without a key length -

-
I have developed an extension which works up to 1.6 on Magren (I'm trying Enterprise Edition, And I think the community is the same problem, because it is the same code). In my install script, I see the $ installer-> gt; CreateEntityTables ($ this- & gt; getTable ('alphanum / info')); The installation is done until it is not in the _text unit table. It crashed there! It turns out that when I log in to SQL and run it via PHPmyadmin, then this error is: Blob / Text column 'value' is used without the key 'key' . I saw the code there, and this is what is trying to create an index on the value column: -> addIndex ($ this- & gt; getIdxName ($ eavTableName, array ( 'attribute_id array (' attribute_id ',' value ')) - & gt; addIndex ($ this- & gt; getIdxName ($ eavTableName, array (' entity_type_id ' , 'Value')), array ('entity_type_id', 'value')) If there is no if statement is n...
Read more

c# - Using Vici cool Storage with monodroid -

-
Oh, for the moment I am not sure how it is officially supported, but for the success of the people Using Monodroid Vic Cool Storage I am able to leave and compile assemblies in my project, but while trying to use some classes, the errors of time have to be gathered. Especially when trying to connect like the example for Mono Touch string dbName = path. Cobain (environment. Gatefolder path (environment specialfolder personal), "mydb.db3"); // The following line will be called coolestation, where is the database, // to make it if it does not exist, and call a delegate that creates the necessary tables (only when the database file was newly created //) CSConfig.SetDB (DbName, true, () => {CSDatabase.ExecuteNonQuery ("Subscriber Integer Primary Key Attribute, Name Text (50) No, Number, Date First Text (30)");); There is no difference when I try to use the methods of CSConfig and when I cscfif If I try to pass 3 aggregates to STDB (3) then I get the invalid ...
Read more

python - referencing a variable in another function? -

-
I am an experienced TCL developer and write my own processes to help myself. I call it a proc i callVar, print out the value of the variable in a certain format, so I know that it is variable and what is the value "set foo 1; putVar foo" result 'foo = "1" I want to do the same thing in Python, but I can not find the answer :( In TCL I use the up command because when I pass the name of the variable, then I can see the value at the top. . I understand that an advanced light in the dragon There is no mechanism of r, but with its introspection capability, I would think that this is something trivial, but I am not getting the answer anywhere. It seems that this should work: and expanded: def foo (): y = "Hello World" printwor ("y") foo () y = "Hello World " You can, but you should not do so if your code is correct If is needed , then there is something wrong with your design, and you should probably use the dictionar...
Read more