Naive but seemly correct implementation.
add PROFILE to help expose computing time.
add common.h to hold common utilities
add: benchmark to measure improvement
begin to solve uva_10341
first attempt
remove common.h
Fix boundary condition: one of p,q,r,s,t,u = 1
Finally got AC. It's a precision problem.
Finally AC...
Merge branch 'master' of https://github.com/southp/sandbox