Custom comparison for integer strings












1















For the input 3 30 34 5 9, the expected largest number output is: 9534330



Any inputs why the sorted is returning the same result as input: 3303459?



import functools



def compare(item1, item2):

    return int(item1 + item2) - int(item2 + item1)



inputList = input().split()

sorted(inputList, key=functools.cmp_to_key(compare))

max = "".join([ x for x in inputList])

print(max)





python python-3.x







share|improve this question




















  • 4





    Because sorted returns a new list.

    – jonrsharpe
    Nov 20 '18 at 7:56


















1















For the input 3 30 34 5 9, the expected largest number output is: 9534330



Any inputs why the sorted is returning the same result as input: 3303459?



import functools



def compare(item1, item2):

    return int(item1 + item2) - int(item2 + item1)



inputList = input().split()

sorted(inputList, key=functools.cmp_to_key(compare))

max = "".join([ x for x in inputList])

print(max)





python python-3.x







share|improve this question




















  • 4





    Because sorted returns a new list.

    – jonrsharpe
    Nov 20 '18 at 7:56
















1












1








1








For the input 3 30 34 5 9, the expected largest number output is: 9534330



Any inputs why the sorted is returning the same result as input: 3303459?



import functools



def compare(item1, item2):

    return int(item1 + item2) - int(item2 + item1)



inputList = input().split()

sorted(inputList, key=functools.cmp_to_key(compare))

max = "".join([ x for x in inputList])

print(max)





python python-3.x







share|improve this question
















For the input 3 30 34 5 9, the expected largest number output is: 9534330



Any inputs why the sorted is returning the same result as input: 3303459?



import functools



def compare(item1, item2):

    return int(item1 + item2) - int(item2 + item1)



inputList = input().split()

sorted(inputList, key=functools.cmp_to_key(compare))

max = "".join([ x for x in inputList])

print(max)





python python-3.x




python python-3.x






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 20 '18 at 8:00









jonrsharpe

77.6k11104211




77.6k11104211










asked Nov 20 '18 at 7:54









RockRock

8117




8117








  • 4





    Because sorted returns a new list.

    – jonrsharpe
    Nov 20 '18 at 7:56
















  • 4





    Because sorted returns a new list.

    – jonrsharpe
    Nov 20 '18 at 7:56










4




4





Because sorted returns a new list.

– jonrsharpe
Nov 20 '18 at 7:56







Because sorted returns a new list.

– jonrsharpe
Nov 20 '18 at 7:56














3 Answers
3






active

oldest

votes


















1














The reason is either because you are sorting the list in the wrong order and you did not use the sorted list. Currently, you are sorting the list in an ascending order by the first digit. In addition to that, sorted() function returns a new list, so you need to save that in a variable.



You can fix that by either using the reverse() on the sorted list



import functools



def compare(item1, item2):

    return int(item1 + item2) - int(item2 + item1)



inputList = input().split()

inputList = sorted(inputList, key=functools.cmp_to_key(compare))

inputList.reverse()

max = "".join([ x for x in inputList])

print(max)


Or switch operation in the compare() function



import functools



def compare(item1, item2):

    return int(item2 + item1) - int(item1 + item2)



inputList = input().split()

inputList = sorted(inputList, key=functools.cmp_to_key(compare))

max = "".join([ x for x in inputList])

print(max)





share|improve this answer































    1














    For exhaustiveness, you can also set the order argument in the sorted() function:
    import functools



    def compare(item1, item2):
    
    return int(item1 + item2) - int(item2 + item1)
    

    
input_list = input().split(",")
    
custom_sorted_list = sorted(input_list, key=functools.cmp_to_key(compare), reverse=True)
    
max = "".join([ x for x in custom_sorted_list])
    
print(max)





    share|improve this answer































      0














      The sorted function returns the list in ascending order.



      But, as you only want the largest number, it is even easier:



      import itertools
      

      
input_list = [3, 30, 34, 5, 9]
      

      
answer = max(map("".join, itertools.permutations(map(str, input_list))))
      

      
print(answer)





      share|improve this answer























        Your Answer






        StackExchange.ifUsing("editor", function () {
        StackExchange.using("externalEditor", function () {
        StackExchange.using("snippets", function () {
        StackExchange.snippets.init();
        });
        });
        }, "code-snippets");

        StackExchange.ready(function() {
        var channelOptions = {
        tags: "".split(" "),
        id: "1"
        };
        initTagRenderer("".split(" "), "".split(" "), channelOptions);

        StackExchange.using("externalEditor", function() {
        // Have to fire editor after snippets, if snippets enabled
        if (StackExchange.settings.snippets.snippetsEnabled) {
        StackExchange.using("snippets", function() {
        createEditor();
        });
        }
        else {
        createEditor();
        }
        });

        function createEditor() {
        StackExchange.prepareEditor({
        heartbeatType: 'answer',
        autoActivateHeartbeat: false,
        convertImagesToLinks: true,
        noModals: true,
        showLowRepImageUploadWarning: true,
        reputationToPostImages: 10,
        bindNavPrevention: true,
        postfix: "",
        imageUploader: {
        brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
        contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
        allowUrls: true
        },
        onDemand: true,
        discardSelector: ".discard-answer"
        ,immediatelyShowMarkdownHelp:true
        });


        }
        });














        draft saved

        draft discarded


















        StackExchange.ready(
        function () {
        StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53388492%2fcustom-comparison-for-integer-strings%23new-answer', 'question_page');
        }
        );

        Post as a guest















        Required, but never shown

























        3 Answers
        3






        active

        oldest

        votes








        3 Answers
        3






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        1














        The reason is either because you are sorting the list in the wrong order and you did not use the sorted list. Currently, you are sorting the list in an ascending order by the first digit. In addition to that, sorted() function returns a new list, so you need to save that in a variable.



        You can fix that by either using the reverse() on the sorted list



        import functools
        

        
def compare(item1, item2):
        
    return int(item1 + item2) - int(item2 + item1)
        

        
inputList = input().split()
        
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
        
inputList.reverse()
        
max = "".join([ x for x in inputList])
        
print(max)


        Or switch operation in the compare() function



        import functools
        

        
def compare(item1, item2):
        
    return int(item2 + item1) - int(item1 + item2)
        

        
inputList = input().split()
        
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
        
max = "".join([ x for x in inputList])
        
print(max)





        share|improve this answer




























          1














          The reason is either because you are sorting the list in the wrong order and you did not use the sorted list. Currently, you are sorting the list in an ascending order by the first digit. In addition to that, sorted() function returns a new list, so you need to save that in a variable.



          You can fix that by either using the reverse() on the sorted list



          import functools
          

          
def compare(item1, item2):
          
    return int(item1 + item2) - int(item2 + item1)
          

          
inputList = input().split()
          
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
          
inputList.reverse()
          
max = "".join([ x for x in inputList])
          
print(max)


          Or switch operation in the compare() function



          import functools
          

          
def compare(item1, item2):
          
    return int(item2 + item1) - int(item1 + item2)
          

          
inputList = input().split()
          
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
          
max = "".join([ x for x in inputList])
          
print(max)





          share|improve this answer


























            1












            1








            1







            The reason is either because you are sorting the list in the wrong order and you did not use the sorted list. Currently, you are sorting the list in an ascending order by the first digit. In addition to that, sorted() function returns a new list, so you need to save that in a variable.



            You can fix that by either using the reverse() on the sorted list



            import functools
            

            
def compare(item1, item2):
            
    return int(item1 + item2) - int(item2 + item1)
            

            
inputList = input().split()
            
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
            
inputList.reverse()
            
max = "".join([ x for x in inputList])
            
print(max)


            Or switch operation in the compare() function



            import functools
            

            
def compare(item1, item2):
            
    return int(item2 + item1) - int(item1 + item2)
            

            
inputList = input().split()
            
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
            
max = "".join([ x for x in inputList])
            
print(max)





            share|improve this answer













            The reason is either because you are sorting the list in the wrong order and you did not use the sorted list. Currently, you are sorting the list in an ascending order by the first digit. In addition to that, sorted() function returns a new list, so you need to save that in a variable.



            You can fix that by either using the reverse() on the sorted list



            import functools
            

            
def compare(item1, item2):
            
    return int(item1 + item2) - int(item2 + item1)
            

            
inputList = input().split()
            
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
            
inputList.reverse()
            
max = "".join([ x for x in inputList])
            
print(max)


            Or switch operation in the compare() function



            import functools
            

            
def compare(item1, item2):
            
    return int(item2 + item1) - int(item1 + item2)
            

            
inputList = input().split()
            
inputList = sorted(inputList, key=functools.cmp_to_key(compare))
            
max = "".join([ x for x in inputList])
            
print(max)






            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 20 '18 at 8:07









            AndreasAndreas

            1,91131018




            1,91131018

























                1














                For exhaustiveness, you can also set the order argument in the sorted() function:
                import functools



                def compare(item1, item2):
                
    return int(item1 + item2) - int(item2 + item1)
                

                
input_list = input().split(",")
                
custom_sorted_list = sorted(input_list, key=functools.cmp_to_key(compare), reverse=True)
                
max = "".join([ x for x in custom_sorted_list])
                
print(max)





                share|improve this answer




























                  1














                  For exhaustiveness, you can also set the order argument in the sorted() function:
                  import functools



                  def compare(item1, item2):
                  
    return int(item1 + item2) - int(item2 + item1)
                  

                  
input_list = input().split(",")
                  
custom_sorted_list = sorted(input_list, key=functools.cmp_to_key(compare), reverse=True)
                  
max = "".join([ x for x in custom_sorted_list])
                  
print(max)





                  share|improve this answer


























                    1












                    1








                    1







                    For exhaustiveness, you can also set the order argument in the sorted() function:
                    import functools



                    def compare(item1, item2):
                    
    return int(item1 + item2) - int(item2 + item1)
                    

                    
input_list = input().split(",")
                    
custom_sorted_list = sorted(input_list, key=functools.cmp_to_key(compare), reverse=True)
                    
max = "".join([ x for x in custom_sorted_list])
                    
print(max)





                    share|improve this answer













                    For exhaustiveness, you can also set the order argument in the sorted() function:
                    import functools



                    def compare(item1, item2):
                    
    return int(item1 + item2) - int(item2 + item1)
                    

                    
input_list = input().split(",")
                    
custom_sorted_list = sorted(input_list, key=functools.cmp_to_key(compare), reverse=True)
                    
max = "".join([ x for x in custom_sorted_list])
                    
print(max)






                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Nov 20 '18 at 8:11









                    leoburgyleoburgy

                    1107




                    1107























                        0














                        The sorted function returns the list in ascending order.



                        But, as you only want the largest number, it is even easier:



                        import itertools
                        

                        
input_list = [3, 30, 34, 5, 9]
                        

                        
answer = max(map("".join, itertools.permutations(map(str, input_list))))
                        

                        
print(answer)





                        share|improve this answer




























                          0














                          The sorted function returns the list in ascending order.



                          But, as you only want the largest number, it is even easier:



                          import itertools
                          

                          
input_list = [3, 30, 34, 5, 9]
                          

                          
answer = max(map("".join, itertools.permutations(map(str, input_list))))
                          

                          
print(answer)





                          share|improve this answer


























                            0












                            0








                            0







                            The sorted function returns the list in ascending order.



                            But, as you only want the largest number, it is even easier:



                            import itertools
                            

                            
input_list = [3, 30, 34, 5, 9]
                            

                            
answer = max(map("".join, itertools.permutations(map(str, input_list))))
                            

                            
print(answer)





                            share|improve this answer













                            The sorted function returns the list in ascending order.



                            But, as you only want the largest number, it is even easier:



                            import itertools
                            

                            
input_list = [3, 30, 34, 5, 9]
                            

                            
answer = max(map("".join, itertools.permutations(map(str, input_list))))
                            

                            
print(answer)






                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Nov 20 '18 at 8:12









                            Vitor SRGVitor SRG

                            41815




                            41815






























                                draft saved

                                draft discarded




















































                                Thanks for contributing an answer to Stack Overflow!


                                • Please be sure to answer the question. Provide details and share your research!

                                But avoid …



                                • Asking for help, clarification, or responding to other answers.

                                • Making statements based on opinion; back them up with references or personal experience.


                                To learn more, see our tips on writing great answers.




                                draft saved


                                draft discarded














                                StackExchange.ready(
                                function () {
                                StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53388492%2fcustom-comparison-for-integer-strings%23new-answer', 'question_page');
                                }
                                );

                                Post as a guest















                                Required, but never shown





















































                                Required, but never shown














                                Required, but never shown












                                Required, but never shown







                                Required, but never shown

































                                Required, but never shown














                                Required, but never shown












                                Required, but never shown







                                Required, but never shown







                                -

                                Popular posts from this blog

                                mysqli_query(): Empty query in /home/lucindabrummitt/public_html/blog/wp-includes/wp-db.php on line 1924

                                Image
                                0 I just uploaded a new plugin to my wordpress site and I got this warning: mysqli_query(): Empty query in /home/lucindabrummitt/public_html/blog/wp-includes/wp-db.php on line 1924 Usually if I have a problem, I can find answers on google but this one seems pretty particular and I'm not finding any info on it except for this forum. I'm not terribly techie but if someone can tell me how to read this and how to change it I can follow directions pretty well. Thanks All! PS If I don't have the proper tags here could someone add the appropriate tags? php mysql wordpress share | improve this question asked Nov 16 '18 at 20:41 ...
                                Read more

                                How to change which sound is reproduced for terminal bell?

                                Image
                                3 Recently upgrade to 18.10 from 18.04, and using the terminal is becoming annoying: the new alert sound is a drip ( /usr/share/sounds/gnome/default/alerts/drip.ogg ), and the previous one is still located at ( /usr/share/sounds/ubuntu/stereo/bell.ogg ). My issue is that at the gnome-terminal, when autocompleting or pressing left BOTH sounds are reproduced, at the same time. I want to just have ubuntu/stereo/bell.ogg active, not both . At the moment I have been only able to reduce the volume of the alerts (but still both are played), or turn the alerts down (but I dislike both "solutions"). gnome-terminal 18.10 teminal-bell share | improve this question ...
                                Read more

                                Can I use Tabulator js library in my java Spring + Thymeleaf project?

                                Image
                                0 I want to add Tabulator js to my java project. I added tabulator.min.js, tabulator.min.css to resources folder. After that added to my html page these dependencies as recommending in readme.md. <link rel="stylesheet" th:href="@{/css/tabulator.min.css}"> <script type="text/javascript" th:src="@{/js/tabulator.min.js}"></script> Now my tables view all elements, that I have in the html page, but not correct. In the documentation of Tabulator is example how to create header and table, var table = new Tabulator("#example-table", { columns:[ {title:"Name", field:"name", sorter:"string", width:200, editor:true}, {title:"Age", field:"age", sorter:"...
                                Read more