update project structure

leetcode_rs/src/main.rs

@@ -0,0 +1,14 @@
+// src/main.rs
+
+mod problem_1 {
+    pub mod solution;
+}
+
+use problem_1::solution::Solution;
+
+fn main() {
+    let nums = vec![2, 7, 11, 15];
+    let target = 9;
+    let result = Solution::two_sum(nums, target);
+    println!("{:?}", result); // 输出: [0, 1]
+}

leetcode_rs/src/problem_1/solution.rs

@@ -0,0 +1,32 @@
+use std::collections::HashMap;
+
+pub struct Solution;
+
+impl Solution {
+    /// This function takes a vector of integers (`nums`) and an integer (`target`) as input.
+    /// It returns a vector of integers.
+    ///
+    /// # Arguments
+    ///
+    /// * `nums` - A vector of integers.
+    /// * `target` - An integer that represents the target sum.
+    ///
+    /// # Returns
+    ///
+    /// This function returns a vector of integers.
+    pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
+        let mut map = HashMap::new();
+
+        for (i, &num) in nums.iter().enumerate() {
+            let complement = target - num;
+
+            if let Some(&index) = map.get(&complement) {
+                return vec![index as i32, i as i32];
+            }
+
+            map.insert(num, i);
+        }
+
+        vec![]
+    }
+}