Cfrgtkky

Consider the following:

documentclass{article}

newtheorem{exe}{Exercise}

newtheorem{sol}{Solution}



begin{document}



    begin{exe}

        dots 

    end{exe}



    begin{sol}

        here the solution for Exercise 1

    end{sol}   



    begin{exe}

        dots 

    end{exe}



    begin{sol}

        here the solution for Exercise 2

    end{sol}



end{document}

Is there a way (a switch) to automatically reorder the theorem environments by type without reordering them manually, that means to get the same output as

documentclass{article}

newtheorem{exe}{Exercise}

newtheorem{sol}{Solution}



begin{document}



    begin{exe}

        dots 

    end{exe}   



    begin{exe}

        dots 

    end{exe}



    begin{sol}

        here the solution for Exercise 1

    end{sol}



    begin{sol}

        here the solution for Exercise 2

    end{sol}



end{document}

?

Update:

Actually I need a "switch" for this one:

documentclass{article}

newtheorem{exe}{Exercise}

newtheorem{sol}{Solution}



begin{document}



    begin{exe}

        dots 

    end{exe}



    bigskip



    begin{sol}

        here the solution for Exercise 1

    end{sol}   



    bigskip



    begin{exe}

        dots 

    end{exe}



    bigskip



    begin{sol}

        here the solution for Exercise 2

    end{sol}



end{document}

so that it has the same output as

documentclass{article}

newtheorem{exe}{Exercise}

newtheorem{sol}{Solution}



begin{document}



    begin{exe}

        dots 

    end{exe}   



    bigskip



    begin{exe}

        dots 

    end{exe}



    bigskip



    begin{sol}

        here the solution for Exercise 1

    end{sol}



    bigskip



    begin{sol}

        here the solution for Exercise 2

    end{sol}



end{document}

You can gather the text of the solutions and print them at a certain point.

This can be accomplished with environ.

documentclass{article}

usepackage{environ}



newtheorem{exe}{Exercise}

newtheorem{printsol}{Solution}



NewEnviron{sol}{%

  xdefsolutionsuptonow{%

    unexpandedexpandafter{solutionsuptonow}%

    noexpandbegin{printsol}%

    unexpandedexpandafter{BODY}%

    noexpandend{printsol}%

  }%

}

newcommand{solutionsuptonow}{}

newcommand{printsolutions}{solutionsuptonowgdefsolutionsuptonows{}}



begin{document}



begin{exe}

dots 

end{exe}



begin{sol}

here the solution for Exercise 1

end{sol}   



begin{exe}

dots 

end{exe}



begin{sol}

here the solution for Exercise 2

end{sol}



printsolutions



end{document}

A different coding that adds spaces between exercises and solutions.

documentclass{article}

usepackage{environ,xparse}



newtheorem{printexe}{Exercise}

newtheorem{printsol}{Solution}



ExplSyntaxOn

NewEnviron{exe}

 {

  thrash_add:NnV g_thrash_exercises_seq {exe} BODY

 }

NewEnviron{sol}

 {

  thrash_add:NnV g_thrash_solutions_seq {sol} BODY

 }



NewDocumentCommand{printexercises}{}

 {

  seq_use:Nn g_thrash_exercises_seq { bigskip }

  bigskip

  seq_use:Nn g_thrash_solutions_seq { bigskip }

  seq_gclear:N g_thrash_exercisess_seq

  seq_gclear:N g_thrash_solutions_seq

 }



seq_new:N g_thrash_exercises_seq

seq_new:N g_thrash_solutions_seq



cs_new_protected:Nn thrash_add:Nnn

 {

  seq_gput_right:Nn #1 { begin{print#2}#3end{print#2} }

 }

cs_generate_variant:Nn thrash_add:Nnn { NnV }



ExplSyntaxOff



begin{document}



begin{exe}

dots 

end{exe}



begin{sol}

here the solution for Exercise 1

end{sol}   



begin{exe}

dots 

end{exe}



begin{sol}

here the solution for Exercise 2

end{sol}



printexercises



end{document}