Tags
 IOS SQL HTML C RUBY-ON-RAILS MYSQL ASP.NET DEVELOPMENT RUBY .NET LINUX SQL-SERVER REGEX WINDOWS ALGORITHM ECLIPSE VISUAL-STUDIO STRING SVN PERFORMANCE APACHE-FLEX UNIT-TESTING SECURITY LINQ UNIX MATH EMAIL OOP LANGUAGE-AGNOSTIC VB6

# All valid combinations of points, in the most (speed) effective way

By : Jason Hattrick
Date : October 18 2020, 11:12 AM
Hope this helps How about "the x coordinate of every point included is the exact sum of some subset of the y coordinates of the other included points". If you can come up with a fast algorithm for that simply-stated constraint problem then you will become very famous indeed.
My point being that the problem as stated is so vague as to admit NP-complete or NP-hard problems. Constraint optimization problems are incredibly hard; if you cannot put extremely tight bounds on the problem then it very rapidly becomes not analyzable by machines in polynomial time.
code :

Share :

## Is there a effective way to get only K combinations of a list?

By : Stacy Sudgen
Date : March 29 2020, 07:55 AM
it helps some times Say I have a simple list from 1 to 8 and only want the combinations that include 7 characters. How could I do that efficiently? Is it possible to do it without iterating the entire list? , itertools.combinations works just fine:
code :
``````>>> for c in itertools.combinations(stuff, 7):
...     print(c)
...
(1, 2, 3, 4, 5, 6, 7)
(1, 2, 3, 4, 5, 6, 8)
(1, 2, 3, 4, 5, 7, 8)
(1, 2, 3, 4, 6, 7, 8)
(1, 2, 3, 5, 6, 7, 8)
(1, 2, 4, 5, 6, 7, 8)
(1, 3, 4, 5, 6, 7, 8)
(2, 3, 4, 5, 6, 7, 8)
``````

## When would it be more effective to use if/else combinations rather than elif?

By : user2474316
Date : March 29 2020, 07:55 AM
may help you . One situation in which a series of if statements can be substituted for an if...elif...else block is when each if statement contains a return:
code :
``````def check(something):
if something == 1:
return "foo"
if something == 2:
return "bar"
return "n/a"
``````

## Most effective way to find combinations in C

By : Emily Smitley
Date : March 29 2020, 07:55 AM
this will help First let's do some naming:
c_{i,j} is the cell at intersection of row i and column j. cross_{i,j} is the set: { c_{r,c} / r=i or c=j }. It is the cross of all cells from row i union column j. It contains an odd number of cells. odd(cross_{i,j}) is a function which returns 0 if there is an even number of black cells in cross_{i,j} and 1 if there is an odd number of black cells.

## IdentityServer4 is returning a valid token whether the userid and password combinations are valid or not

By : FlyingCoro
Date : March 29 2020, 07:55 AM
If it is not null, then the problem is with how you are returning the Task.
code :
``````context.Result = new GrantValidationResult(TokenRequestErrors.UnauthorizedClient);
``````
``````context.Result = new GrantValidationResult(user.UserName, "password", claims);
``````for p in itertools.product(points, repeat=2):