pvsort.cc  :  sort a std::vector of Vector2D according to vector mod.
vbound.cc  :  binary search over a vector<int>
pbound.cc  :  binary search over an array of int
lambda.cc  :  C++11: sort a vector using a "lambda function"

to compile:

c++ -Wall -o pvsort pvsort.cc Vector2D.cc
c++ -Wall -o vbound vbound.cc
c++ -Wall -o pbound pbound.cc
c++ -Wall -o lambda lambda.cc Vector2D.cc -std=c++11
