#include <algorithm>
#include <cassert>
#include <iostream>
#include <iterator>
#include <vector>
int main()
{
std::vector<int> v = {1,2,3};
assert(std::is_sorted(std::begin(v),std::end(v))
&& "The vector must be sorted to see all permutations");
//Display std::vector
std::cout << "Initial v: ";
std::copy(std::begin(v),std::end(v),std::ostream_iterator<int>(std::cout," "));
std::cout << '\n';
//Obtain the next permutation
while(std::next_permutation(std::begin(v),std::end(v)))
{
//Display std::vector
std::cout << "Next permutation: ";
std::copy(std::begin(v),std::end(v),std::ostream_iterator<int>(std::cout," "));
std::cout << '\n';
}
//Sort and reverse the std::vector
std::sort(std::begin(v),std::end(v));
std::reverse(std::begin(v),std::end(v));
//Display std::vector
std::cout << "Reverse-sorted v: ";
std::copy(std::begin(v),std::end(v),std::ostream_iterator<int>(std::cout," "));
std::cout << '\n';
//Obtain the previous permutation
while(std::prev_permutation(std::begin(v),std::end(v)))
{
//Display std::vector
std::cout << "Previous permutation: ";
std::copy(std::begin(v),std::end(v),std::ostream_iterator<int>(std::cout," "));
std::cout << '\n';
}
}
/* Screen output
Initial v: 1 2 3
Next permutation: 1 3 2
Next permutation: 2 1 3
Next permutation: 2 3 1
Next permutation: 3 1 2
Next permutation: 3 2 1
Reverse-sorted v: 3 2 1
Previous permutation: 3 1 2
Previous permutation: 2 3 1
Previous permutation: 2 1 3
Previous permutation: 1 3 2
Previous permutation: 1 2 3
Press <RETURN> to close this window...
*/
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Lubuntu 15.04 (vivid)
Qt Creator 3.1.1
STL: GNU ISO C++ Library, version 4.9.2
