Thanks for your effort :)

This version in C++ was recently approved and I checked author´s translation is inactive. I'll ask for an user that manages well with this language. Sorry for that.

Hi!

Problem with C++.

Test is OK, but when attempting it throws:

In file included from main.cpp:7:

./tests.cpp:22:40: error: use of undeclared identifier 'h'

for (; lowest < 10; lowest++) r += h(n - lowest, digits - 1, lowest);

1 error generated.