$ g++ a36.cpp graph.cpp linear.cpp lt.cpp; a.exe
srand=1144250565
mode=0 ltexcess=61 liexcess=1.60334
mode=1 ltexcess=61 liexcess=1.63474
mode=2 ltexcess=61 liexcess=8.65096
mode=3 ltexcess=61 liexcess=1.59898