1 files changed, 0 insertions, 85 deletions
diff --git a/Demo/scripts/queens.py b/Demo/scripts/queens.py
deleted file mode 100755
index ffd4bea..0000000
--- a/Demo/scripts/queens.py
+++ /dev/null
@@ -1,85 +0,0 @@
-#! /usr/bin/env python3
-
-"""N queens problem.
-
-The (well-known) problem is due to Niklaus Wirth.
-
-This solution is inspired by Dijkstra (Structured Programming).  It is
-a classic recursive backtracking approach.
-
-"""
-
-N = 8                                   # Default; command line overrides
-
-class Queens:
-
-    def __init__(self, n=N):
-        self.n = n
-        self.reset()
-
-    def reset(self):
-        n = self.n
-        self.y = [None] * n             # Where is the queen in column x
-        self.row = [0] * n              # Is row[y] safe?
-        self.up = [0] * (2*n-1)         # Is upward diagonal[x-y] safe?
-        self.down = [0] * (2*n-1)       # Is downward diagonal[x+y] safe?
-        self.nfound = 0                 # Instrumentation
-
-    def solve(self, x=0):               # Recursive solver
-        for y in range(self.n):
-            if self.safe(x, y):
-                self.place(x, y)
-                if x+1 == self.n:
-                    self.display()
-                else:
-                    self.solve(x+1)
-                self.remove(x, y)
-
-    def safe(self, x, y):
-        return not self.row[y] and not self.up[x-y] and not self.down[x+y]
-
-    def place(self, x, y):
-        self.y[x] = y
-        self.row[y] = 1
-        self.up[x-y] = 1
-        self.down[x+y] = 1
-
-    def remove(self, x, y):
-        self.y[x] = None
-        self.row[y] = 0
-        self.up[x-y] = 0
-        self.down[x+y] = 0
-
-    silent = 0                          # If true, count solutions only
-
-    def display(self):
-        self.nfound = self.nfound + 1
-        if self.silent:
-            return
-        print('+-' + '--'*self.n + '+')
-        for y in range(self.n-1, -1, -1):
-            print('|', end=' ')
-            for x in range(self.n):
-                if self.y[x] == y:
-                    print("Q", end=' ')
-                else:
-                    print(".", end=' ')
-            print('|')
-        print('+-' + '--'*self.n + '+')
-
-def main():
-    import sys
-    silent = 0
-    n = N
-    if sys.argv[1:2] == ['-n']:
-        silent = 1
-        del sys.argv[1]
-    if sys.argv[1:]:
-        n = int(sys.argv[1])
-    q = Queens(n)
-    q.silent = silent
-    q.solve()
-    print("Found", q.nfound, "solutions.")
-
-if __name__ == "__main__":
-    main()