Jeremy List questions

Jeremy List answers

• Variation of TSP which visits multiple cities
• On Haskell, there a standard function that performs "scan" on a tree?
• Haskell recursion in 'do' notation
• ConcatMap in haskell without ++
• When is unsafeInterleaveIO unsafe?
• Elegant way to return the longer of two strings
• How to use getQ and putQ in template haskell?
• Does Writer Monad guarantee right associative concatenation?
• Tips for more elegant code with monads?
• Simple unix domain sockets server