puzzle #120

in.txt

where in c++ code read and use value 800000000000000000000000000000 and FFFFFFFFFFFFFFFFFFFFFFFFFFFFFF to use as range search

I would like to compare c++ work
and use modify old python code to use range like c++

now I use JeanLucPons Kangaroo by split keyspace to small part and search
when use full rank, my CPU very high and use Full memory, I think 16GB laptop not enough for 120bit search may be need 64Gb to 128GB high end memory board