3 files changed, 101 insertions, 0 deletions
diff --git a/0002/Cargo.lock b/0002/Cargo.lock
new file mode 100644
index 0000000..2607e79
--- /dev/null
+++ b/0002/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "p2"
+version = "0.1.0"
diff --git a/0002/Cargo.toml b/0002/Cargo.toml
new file mode 100644
index 0000000..5253ff9
--- /dev/null
+++ b/0002/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "p2"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/0002/src/main.rs b/0002/src/main.rs
new file mode 100644
index 0000000..2cc01f3
--- /dev/null
+++ b/0002/src/main.rs
@@ -0,0 +1,88 @@
+#[derive(PartialEq, Eq, Clone, Debug)]
+pub struct ListNode {
+    pub val: i32,
+    pub next: Option<Box<ListNode>>
+}
+//
+impl ListNode {
+    #[inline]
+    pub fn new(val: i32) -> Self {
+        ListNode {
+            next: None,
+            val
+        }
+    }
+}
+
+pub fn vector2list(vec: Vec<i32>) -> Option<Box<ListNode>> {
+    let mut result: Option<Box<ListNode>> = None;
+    for i in 0..vec.len() {
+        let mut new_result = Some(Box::new(ListNode::new(vec[vec.len() - i - 1])));
+        new_result.as_mut().unwrap().next = result;
+        result = new_result;
+    }
+    result
+}
+
+pub fn list2vector(lst: Option<Box<ListNode>>) -> Vec<i32> {
+    let mut result: Vec<i32> = Vec::new();
+    let mut cur = &lst;
+    loop {
+        match cur {
+            None => break,
+            Some(node) => {
+                result.push(node.val);
+                cur = &node.next;
+            },
+        }
+    }
+    result
+}
+
+struct Solution {}
+
+impl Solution {
+    pub fn add_two_numbers(l1: Option<Box<ListNode>>, l2: Option<Box<ListNode>>) -> Option<Box<ListNode>> {
+        let mut result: Option<Box<ListNode>> = None;
+        let mut cur1 = &l1;
+        let mut cur2 = &l2;
+        let mut carry: i32 = 0;
+        {
+            let mut cur_res = &mut result;
+            loop {
+                if *cur1 == None && *cur2 == None && carry == 0 {
+                    break;
+                } else {
+                    let n1 = match cur1 {
+                        Some(node) => {
+                            cur1 = &cur1.as_ref().unwrap().next;
+                            node.val
+                        },
+                        None => 0
+                    };
+                    let n2 = match cur2 {
+                        Some(node) => {
+                            cur2 = &cur2.as_ref().unwrap().next;
+                            node.val
+                        },
+                        None => 0
+                    };
+                    let n = (n1 + n2 + carry) % 10;
+                    carry = if (n1 + n2 + carry) >= 10 { 1 } else { 0 };
+                    *cur_res = Some(Box::new(ListNode::new(n)));
+                    cur_res = &mut cur_res.as_mut().unwrap().next;
+                    continue;
+                }
+            }
+        }
+        result
+    }
+}
+
+fn test(l1: Vec<i32>, l2: Vec<i32>) -> Vec<i32> {
+    list2vector(Solution::add_two_numbers(vector2list(l1), vector2list(l2)))
+}
+
+fn main() {
+    println!("{:?}", test(vec![1,2,3], vec![4,5,6]));
+}