Update 0206-reverse-linked-list.rs

cleaner solution than the original
Gyanachand1 · Oct 23, 2023 · e4a0dd0 · e4a0dd0
1 parent a88f493
commit e4a0dd0
Showing 1 changed file with 7 additions and 14 deletions.
diff --git a/rust/0206-reverse-linked-list.rs b/rust/0206-reverse-linked-list.rs
@@ -1,18 +1,11 @@
 impl Solution {
  pub fn reverse_list(mut head: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
- let mut node = None;
- while let Some(next) = head {
- node =
- Some (
- Box::new (
- ListNode {
- next : node,
- val : next.val,
- }
- ) 
- );
- head = next.next;
- }
- node
+ let (mut prev, mut curr) = (None, head);
+ while let Some(mut node) = curr{
+ curr = node.next;
+ node.next = prev;
+ prev = Some(node);
+ } 
+ pre
  }
 }