Current AtCoder Beginner Contest has 6 questions and each question has 3 samples.

In atcoder contest, haskell-platform is used for build environment, however I've not installed yet (or don't want to install them...?), so I have these plans.

• Install haskell-platform in sandbox environment
  • My environment is over fitting to haskell-platform
• Use stack to build the source code
  • It is difficult to multi Main.hs separately
  • If I have to answer 4 questions, I might want to 4 stack projects
• Use cabal to build the source code
  • I've not consider this plan yet, it can be suitable for this usage

Required features

• Easy Importing sample inputs
  • #15 Created new scraper
• Easy coding with ghci which reload current code
• Fast recompile
  • use hie or stack ghci
• Fast & simple test runner
  • use stack ghci ---ghci-options "-e Test.main"
• Testing with -O2 compilation #12
  • use stack ghc --O2
• Do not miss runtime error #11
  • use captureProcessResult and get exception first.
• Easy create new project
  • #15 Created new scraper

Maybe, its access was denied because of no credentials.

executables:
  a:
    main:                Main.hs
    source-dirs:         a
  b:
    main:                Main.hs
    source-dirs:         b
  c:
    main:                Main.hs
    source-dirs:         c
  d:
    main:                Main.hs
    source-dirs:         d
  e:
    main:                Main.hs
    source-dirs:         e
  f:
    main:                Main.hs
    source-dirs:         f

This part should be declared using actual tasks in the problems.

see this and rewrite makefiles with tasty-golden

In the ghci environment, my code cannot be optimized.
It should use ghc with -O2 option to measure execution time.

First, run:

$ make a-gen https://beta.atcoder.jp/contests/abc115/tasks/abc115_a

and then I get input1 / expect1 / input2 / expect2

Use this

• containers
• vector
• text
• etc...