diff --git a/src/list.rs b/src/list.rs
index 26ce729..77e55bb 100644
--- a/src/list.rs
+++ b/src/list.rs
@@ -7,7 +7,7 @@ pub struct ListNode {
 
 impl ListNode {
   #[inline]
-  fn new(val: i32) -> Self {
+  pub fn new(val: i32) -> Self {
     ListNode {
       next: None,
       val
diff --git a/src/main.rs b/src/main.rs
index 66c5b2a..f1b8450 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,12 +1,28 @@
+use crate::list::{ListNode, make_list};
+
 mod arr;
+mod list;
 mod tree;
 
 struct Solution {}
 impl Solution {
-    pub fn reverse_words(s: String) -> String {
-        s.split(' ').filter(|s| !s.is_empty()).rev().collect::<Vec<_>>().join(" ")
+    pub fn training_plan(head: Option<Box<ListNode>>, cnt: i32) -> Option<Box<ListNode>> {
+        let mut fast = &head;
+
+        for i in 0..cnt {
+            fast = &fast.as_ref()?.next;
+        }
+        let mut slow = &head;
+        while fast.is_some() {
+            slow = &slow.as_ref()?.next;
+            fast = &fast.as_ref()?.next;
+        }
+        slow.clone()
     }
 }
 fn main() {
-    println!("{:?}", Solution::reverse_words("a good   example".to_string()));
+    println!(
+        "{:?}",
+        Solution::training_plan(make_list(vec![2, 4, 7, 8]), 2)
+    );
 }