add Solution 0141 [golang]

Author: lightfish-zhang

solution/0141.Linked List Cycle/Solution.go

@@ -0,0 +1,20 @@
+/*
+ * @lc app=leetcode.cn id=141 lang=golang
+ *  17/17 cases passed (12 ms)， memory usage 4 MB
+ */
+func hasCycle(head *ListNode) bool {
+	if head == nil || head.Next == nil {
+		return false
+	}
+	slow, fast := head, head.Next
+	for {
+		if fast == nil || fast.Next == nil {
+			return false
+		}
+		if slow == fast {
+			return true
+		}
+		slow, fast = slow.Next, fast.Next.Next
+	}
+	return false
+}