wired problem about next_permutation Post: 302501861

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Top Forums Programming wired problem about next_permutation Post 302501861 by homeboy on Saturday 5th of March 2011 08:49:53 AM

03-05-2011

Registered User

wired problem about next_permutation

hello all,
If i have a vector of strings,i wanna get all possible combinations of them,for example,the elements of that vector are
"hello" "world" "!"
I thought the answer should be:

Code:

hello world !
hello ! world
world ! hello
world hello !
! hello world
! world hello

However,with the code below ,i got the result like this:

Code:

helloworld!
world!hello
worldhello!

what's the problem?

Code:

int main()
{
	string ch[] = {"hello","world","!"};
	vector<string> vec(ch,ch+3);

	do{
		vector<string>::iterator pos = vec.begin();	
		cout<<*pos<<*(pos+1)<<*(pos+2)<<endl;
	}while(next_permutation(vec.begin(),vec.end()));
	
}

---------- Post updated at 08:49 AM ---------- Previous update was at 08:02 AM ----------

Ooh.i checked the definition of next_permutation.This algorithm earranges the elements in the range [first, last) into the lexicographically next greater permutation of elements.I think it means if i want to produce all the combinations,it's better to sort the vector so that i can get the very first permutation.So,when the elements are 1,2,3 and 2,1,3,they are different,Is that right?

homeboy

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LEARN ABOUT OPENSOLARIS

mlib_vectorreversebyteorder

mlib_VectorReverseByteOrder(3MLIB)			    mediaLib Library Functions				mlib_VectorReverseByteOrder(3MLIB)

NAME

       mlib_VectorReverseByteOrder - reverse byte order of vector

SYNOPSIS

       cc [ flag... ] file... -lmlib [ library... ]
       #include <mlib.h>

       mlib_status mlib_VectorReverseByteOrder(void *z, const void *x,
	    mlib_s32 n, mlib_s32 s);

DESCRIPTION

       The  mlib_VectorReverseByteOrder() function changes the encoding of each element from big endian to little endian, or from little endian to
       big endian.

       It copies and reverses the byte order of each element of the input vector into the output vector.

PARAMETERS

       The function takes the following arguments:

       z    Pointer to the output vector.

       x    Pointer to the input vector.

       n    Number of elements in the vectors.

       s    Size of elements in bytes.

RETURN VALUES

       The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mlib_VectorReverseByteOrder_Inp(3MLIB), mlib_VectorReverseByteOrder_S16(3MLIB), mlib_VectorReverseByteOrder_S16_S16(3MLIB), attributes(5)

SunOS 5.11							    2 Mar 2007					mlib_VectorReverseByteOrder(3MLIB)

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mlib_vectorreversebyteorder