void push_front(const value_type& x);
#include <iostream> #include<list> using namespace std; int main() { list<int> li={20,30,40,50}; li.push_front(10); list<int>::iterator itr; for(itr=li.begin();itr!=li.end();++itr) cout<<*itr<<","; return 0; }
10,20,30,40,50