add new solutions

solutions/0/q19/solution.go

@@ -0,0 +1,26 @@
+package q19
+
+type ListNode struct {
+	Val  int
+	Next *ListNode
+}
+
+func removeNthFromEnd(head *ListNode, n int) *ListNode {
+	stub := &ListNode{Next: head}
+
+	probe := stub
+	for range n {
+		probe = probe.Next
+	}
+	prev := stub
+
+	for probe.Next != nil {
+		probe = probe.Next
+		prev = prev.Next
+	}
+	prev.Next = prev.Next.Next
+
+	return stub.Next
+}
+
+var _ = removeNthFromEnd