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Task/Topswops/Phix/topswops.phix

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+function fannkuch(integer n)
+sequence start = tagset(n),
+         perm,
+         perm1 = start,
+         count = start
+integer maxFlipsCount = 0, r = n+1
+integer perm0, flipsCount, k, k2, j, j2
+
+    while 1 do
+        while r!=1 do count[r-1] = r r -= 1 end while
+        if not (perm1[1]=1 or perm1[n]=n) then
+            perm = perm1
+            flipsCount = 0
+            k = perm[1]
+            while k!=1 do
+                k2 = floor((k+1)/2)
+                perm = reverse(perm[1..k]) & perm[k+1..n]
+                flipsCount += 1
+                k = perm[1]
+            end while
+            if flipsCount>maxFlipsCount then
+                maxFlipsCount = flipsCount
+            end if
+        end if
+        -- Use incremental change to generate another permutation
+        while 1 do
+            if r>n then return maxFlipsCount end if
+            perm0 = perm1[1]
+            j2 = 1
+            while j2<r do
+                j = j2+1
+                perm1[j2] = perm1[j]
+                j2 = j
+            end while
+            perm1[r] = perm0
+            count[r] = count[r]-1
+            if count[r]>1 then exit else r += 1 end if
+        end while
+    end while
+end function -- fannkuch
+
+for i=1 to 10 do
+    ? fannkuch(i)
+end for