std::vector

#include <vector>  to use
We have to specify the type to store
Elements added with  push_back()
Elements accessed like std::string
 std::vector<int>  vi;
 std::vector<char>  vc;
 vi.push_back(1);   vi.push_back(10);
 vc.push_back('a');   vc.push_back('z');
 std::cout  <<  vi.at(1)  <<  vc[0]  <<  '\n';