Important Cpp snipets

stl_functions.cpp

//using next permutation
 while(next_permutation(vec.begin(), vec.end()) ){
        // do some processing on vec
 }

//using sort
std::sort (myvector.begin(), myvector.begin()+4)
std::sort (myvector.begin(), myvector.end())

//intialise vector with another array
static const int arr[] = {16,2,77,29};
vector<int> vec (arr, arr + sizeof(arr) / sizeof(arr[0]) );

//making a pair
std::pair <int,int> foo,bar;

foo = std::make_pair (10,20);
bar = std::make_pair (10.5,'A');

//get the index of iterator
it - vec.begin()
std::distance(vec.begin(), it)


//sort with storing indices
typedef std::pair<int,int> mypair;
/*store index,value in mypair and sort with given function*/
bool comparator ( const mypair& l, const mypair& r)
{ return l.first < r.first; }
   

using_stringstream.cpp

int main()
{
	string st,str1;
	getline(cin,st);
	istringstream ss(st);
	while(ss>>str1){
			cout<<str1<<endl;
	}
	return 0;	
}