rename

merge-two-sorted-lists-21/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "merge-two-sorted-lists"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

merge-two-sorted-lists-21/src/main.rs

@@ -0,0 +1,39 @@
+fn main() {
+    println!("Hello, world!");
+}
+
+// Definition for singly-linked list.
+#[derive(PartialEq, Eq, Clone, Debug)]
+pub struct ListNode {
+    pub val: i32,
+    pub next: Option<Box<ListNode>>,
+}
+
+impl ListNode {
+    #[inline]
+    fn new(val: i32) -> Self {
+        ListNode { next: None, val }
+    }
+}
+
+pub fn merge_two_lists(
+    list1: Option<Box<ListNode>>,
+    list2: Option<Box<ListNode>>,
+) -> Option<Box<ListNode>> {
+    match (list1, list2) {
+        (Some(mut node1), Some(mut node2)) => {
+            if node1.val < node2.val {
+                let next = node1.next.take(); // Take ownership of `node1.next`
+                node1.next = merge_two_lists(next, Some(node2));
+                Some(node1)
+            } else {
+                let next = node2.next.take(); // Take ownership of `node2.next`
+                node2.next = merge_two_lists(Some(node1), next);
+                Some(node2)
+            }
+        }
+        (Some(node1), None) => Some(node1),
+        (None, Some(node2)) => Some(node2),
+        (None, None) => None,
+    }
+}