2nd part

knot_tying.rb

@@ -0,0 +1,97 @@
+INPUT = [97,167,54,178,2,11,209,174,119,248,254,0,255,1,64,190]
+INPUT2 = "97,167,54,178,2,11,209,174,119,248,254,0,255,1,64,190"
+           
+def do_knot text
+  knot_lol = (0..255).to_a
+  skips = 0
+  curr_pos = 0
+  text.each do |i|
+    temp = []
+    
+    (0...i).each do |j|
+      temp << (knot_lol[(curr_pos+j) % 256])
+    end
+    (0...i).each do |j|
+      knot_lol[(curr_pos+i-1-j) % 256] = temp[j]
+    end
+    curr_pos += skips + i
+    skips += 1
+  end
+  knot_lol
+end
+
+
+
+           
+def do_knot2 text
+  knot_lol = (0..255).to_a
+  skips = 0
+  curr_pos = 0
+  (0...64).each do 
+    text.each do |i|
+      temp = []
+      
+      (0...i).each do |j|
+        temp << (knot_lol[(curr_pos+j) % 256])
+      end
+      (0...i).each do |j|
+        knot_lol[(curr_pos+i-1-j) % 256] = temp[j]
+      end
+      curr_pos += skips + i
+      skips += 1
+    end
+  end
+  knot_lol
+end
+
+def dense_hash input
+  blocks = input.each_slice(16).to_a
+  final_hash = []
+  blocks.each do |block|
+    hash = block[0]
+    block[1..block.size-1].each do |s|
+      hash = hash ^ s
+    end
+    final_hash << hash
+  end
+  final_hash
+end
+
+def knot_hash input
+  knot_hashed = []
+  input.each do |s|
+    a = s.to_s(16)
+    if a.size == 1 then a = "0" + a end
+    knot_hashed << a
+  end
+  knot_hashed.join ""
+end
+
+
+# input.each do |size|
+#  # p skips+curr_val
+ 
+#   if size > 0 then
+#     knot_lol = knot_lol.each_slice(size).to_a
+# #    p knot_lol
+#     knot_lol[0].reverse!
+# #    p knot_lol
+#     knot_lol.flatten!
+#   end
+#   knot_lol = knot_lol.rotate(skips+curr_val)
+
+#   head += (size + [skips, 0].max)
+#   head = head % 5
+# #  p "head " + knot_lol[head].to_s
+
+  
+#   skips += 1
+#   curr_val = size
+# #  p knot_lol
+# end
+
+out = do_knot INPUT
+p (out[0] * out[1]).to_s
+
+input_2 = INPUT2.split("").map(&:ord) + [17, 31, 73, 47, 23]
+p knot_hash dense_hash do_knot2 input_2