There is only one image sort the array answer? ! ? Why is that?

CodePudding user response:

Usage, you have a good look at the next_permutation function before use must be sorted by ascending order before you can get all, otherwise we are in now based on the sort of continue to arrange
Permutations of data of ascending to the descending process, such as
123
132
213
231
312
321
It can be seen from 123 to 321
So the first kind, has lined up in reverse chronological order, so next_permutation won't be able to take the next group to arrange take
https://blog.csdn.net/HowardEmily/article/details/68064377

CodePudding user response:

reference 1st floor qybao response:

do you have a good look at the next_permutation function usage, before use must be sorted by ascending order before you can get all, otherwise we are in now based on the sort of continue to arrange
Permutations of data of ascending to the descending process, such as
123
132
213
231
312
321
It can be seen from 123 to 321
So the first kind, has lined up in reverse chronological order, so next_permutation won't be able to take the next group to arrange take
https://blog.csdn.net/HowardEmily/article/details/68064377

ok, understand, thank you

CodePudding user response:

reference 1st floor qybao response:

do you have a good look at the next_permutation function usage, before use must be sorted by ascending order before you can get all, otherwise we are in now based on the sort of continue to arrange
Permutations of data of ascending to the descending process, such as
123
132
213
231
312
321
It can be seen from 123 to 321
So the first kind, has lined up in reverse chronological order, so next_permutation won't be able to take the next group to arrange take
https://blog.csdn.net/HowardEmily/article/details/68064377

To learn!