diff --git a/ruby/elegant_shit.rb b/ruby/elegant_shit.rb
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index 0000000000000000000000000000000000000000..4af8c90c598f20e2d213734a38896fa8dba94043
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+++ b/ruby/elegant_shit.rb
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+# 需求：
+# 输入: candidates = [2,3,6,7], target = 7,
+# 所求解集为:
+#     [
+#         [7],
+#         [2,2,3]
+#     ]
+
+# 一开始的实现，看起来贼乱也不好理解
+
+def combination_sum(candidates, target)
+  result=Array.new
+  manage_num(candidates, target, result)
+  result.each {|re| re.sort!}
+  result.sort
+end
+
+def manage_num(candidates, target, result, num_array=Array.new, sum=0)
+  if target==sum
+    result.push num_array
+    return
+  else
+    for i in 0.upto(candidates.size-1)
+      if target>=sum+candidates[i]
+        tmpNumsNew=num_array.dup
+        tmpNumsNew.push candidates[i]
+        manage_num(candidates[i..-1], target, result, tmpNumsNew, sum+candidates[i])
+      end
+    end
+  end
+end
+
+
+#ruby要优雅～～～～，善于使用ruby方法
+
+def combination_sum(candidates, target)
+  return [[]] if target == 0
+  return [] if target < candidates.min
+  candidates.flat_map{|c| combination_sum(candidates,target - c).map {|f| [c,*f].sort } }.uniq #recur
+end