I am facing issue in using the Policy Based Data Structures in C++ as the following errors occur. So far I have tried:

1) Updated and used GCC

$ gcc NONAME00.cpp
NONAME00.cpp:8:10: fatal error: 'ext/pb_ds/assoc_container.hpp' file not found
#include <ext/pb_ds/assoc_container.hpp>
         ^~~~~~~~~~~~
1 error generated.

2) Updated and used G++

$ g++ NONAME00.cpp
NONAME00.cpp:8:10: fatal error: 'ext/pb_ds/assoc_container.hpp' file not found
#include <ext/pb_ds/assoc_container.hpp>
         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

3) Added the files <ext/pb_ds/assoc_container.hpp> and <ext/pb_ds/tree_policy.hpp> to respective locations and then again compiled with gcc and g++.

Can anyone tell me the solution to this?

Can anyone tell me what is the best way to know the execution time of my source code? Best means that the execution of that method to determine time doesn't affect or has minimal effect on the code's actual runtime.