#include <iostream>
#include <list>
using namespace std;
int main()
{
list<int> lst1, lst2;
int i;
for(i=0; i<10; i++) lst1.push_back(i);
for(i=0; i<10; i++) lst2.push_front(i);
list<int>::iterator p;
p = lst1.begin();
while(p != lst1.end()) {
cout << *p << " ";
p++;
}
p = lst2.begin();
while(p != lst2.end()) {
cout << *p << " ";
p++;
}
return 0;
}
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