add new solutions

solutions/0/q86/solution.go

@@ -0,0 +1,30 @@
+package q86
+
+type ListNode struct {
+	Val  int
+	Next *ListNode
+}
+
+func partition(head *ListNode, x int) *ListNode {
+	stub := &ListNode{Next: head}
+	before := stub
+	for before.Next != nil && before.Next.Val < x {
+		before = before.Next
+	}
+
+	for p := before.Next; p != nil && p.Next != nil; {
+		if p.Next.Val < x {
+			move := p.Next
+			p.Next = move.Next
+
+			move.Next = before.Next
+			before.Next = move
+			before = move
+		} else {
+			p = p.Next
+		}
+	}
+	return stub.Next
+}
+
+var _ = partition