Data.SBV.Examples.Puzzles.NQueens

Solves the NQueens puzzle: http://en.wikipedia.org/wiki/Eight_queens_puzzle

Documentation

type Solution = [SWord8]

A solution is a sequence of row-numbers where queens should be placed

isValid :: Int -> Solution -> SBool

Checks that a given solution of n-queens is valid, i.e., no queen captures any other.

nQueens :: Int -> IO ()

Given n, it solves the n-queens puzzle, printing all possible solutions.