26. template<typename Iterator, typename Tp>
Iterator find(Iterator first, Iterator last, const Tp& val)
{
while (first != last && !(*first == val)) ++first;
return first;
}

27. template<typename Iterator, typename Tp>
Iterator find(Iterator first, Iterator last, const Tp& val)
{
while (first != last && !(*first == val)) ++first;
return first;
}

37. struct X{
X(std::vector<int>&& v){...}
};

38. struct X{
X(std::vector<int>&& v){...}
};

39. vector<int> v;
for(int value : v) {
cout << value << endl;
}

40. std::vector<int> v;
std::vector<int>::iterator it = v.begin();
std::vector<int> v;
auto it = v.begin();

41. vector<int> v;
find_if(v.begin(), v.end(),
[](int x) -> bool { return x % 2 == 0; });
auto f = [](){};

42. int* p = nullptr;