add new solutions

solutions/0/q61/solution.go

@@ -0,0 +1,35 @@
+package q61
+
+type ListNode struct {
+	Val  int
+	Next *ListNode
+}
+
+func rotateRight(head *ListNode, k int) *ListNode {
+	if head == nil {
+		return nil
+	}
+	n := 1
+	p := head
+	for p.Next != nil {
+		p = p.Next
+		n++
+	}
+	tail := p
+
+	k %= n
+	if k == 0 {
+		return head
+	}
+
+	tail.Next = head
+	p = head
+	for range n - k - 1 {
+		p = p.Next
+	}
+	newHead := p.Next
+	p.Next = nil
+	return newHead
+}
+
+var _ = rotateRight