Permutation c++

bool next_permutation(BidirectionalIterator first, BidirectionalIterator last);
bool prev_permutation(BidirectionalIterator first, BidirectionalIterator last);

//Example:
 int a[]={1,2,3,4};
 do {
	for(auto& i : a) cout<<i<<" ";
	cout<<endl;
 } while (next_permutation(a,a+4));

-1

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