Do the following operations using the STL vector. After each step display the output

1.Create an integer vector x and insert 20,21 12

2.Create an integer vector y and insert 10,11,12,13,14 // use 1 line of code to insert these elements

3. Insert 44 before the second element of vector y

4. Insert the contents of x before the second element of vector y

5. Insert three-time 100 before the fourth element of vector y, also display the size of the vector

6. Erase the second to the fifth element of vector y

7. Clear all of y's elements and display the size of the vector.

It's a C++ program.