$ g++ a44.cpp recv.cpp graph.cpp linear.cpp lt.cpp couple.cpp; a.exe
srand=1144771749
   0, 0, 3, 4, 9,10,15,16, 3, 4, 8,10,13,17,19,11.000000,0.296820
   1, 3, 5, 7, 8,15,16,17, 1, 2, 4, 7,15,18,19,11.000000,0.426712
   2, 0, 4, 5, 6,11,14,19, 0, 2, 3, 4, 9,13,17,11.000000,0.418135
   3, 9,11,12,13,15,17,18, 1, 2, 9,13,14,16,17,11.000000,0.297955
   4, 1, 4, 5, 7,11,12,14, 1, 4, 6, 8,11,12,17,11.000000,0.297234
   5, 3, 5, 7,11,12,14,15, 0, 3, 4, 6,16,18,19,11.000000,0.299541
   6, 3, 9,11,12,15,17,19, 1, 5, 6, 7, 8, 9,15,11.000000,0.303604
   7, 1, 2, 4, 6,10,11,16, 0, 1, 2, 3, 4, 7,18,11.000000,0.313216
   8, 4, 5, 8, 9,12,18,19, 2, 7,10,11,12,13,17,11.000000,0.276099
   9, 1, 2, 3, 9,10,13,16, 0, 2, 3, 5, 6,13,16,11.000000,0.273964
  10, 4, 9,10,14,16,17,18, 2, 3,10,11,12,14,19,11.000000,0.274189