2: OK; rank  used

3:
E5: DebugVector(): numprocs iterations (cumbersome)

E6: OK

E7: MinMax: incl. global exchange

E8: Allroallv: two versions realized

4:
E9: only the initialization from template has been used, not the coordinates [-1]

E10: _sendbuf is vector<double>
VecAccu(...int..)  correct


E11: ??
Global_Nodes() : Please explain in the lecture 


E12: Ok

E13: not available

E14:
make run COMPILER=GH_GCC_#
Iteration counts are different for all 4 processes
Code doesn't stop

See annotated E14.pdf

GH:   commented main.cpp:82
GH: uncommented main.cpp:89

at least, you tried it!  [2 pts]