diff --git a/commit.sh b/commit.sh
new file mode 100755
index 0000000..506d674
--- /dev/null
+++ b/commit.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+
+set -e
+
+time=$(date "+%Y%m%d")
+message="$time Finished"
+
+git add -A
+git commit -m "$message"
+
+git push
diff --git a/src/problem/mod.rs b/src/problem/mod.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/solution/mod.rs b/src/solution/mod.rs
new file mode 100644
index 0000000..1c261c7
--- /dev/null
+++ b/src/solution/mod.rs
@@ -0,0 +1 @@
+mod s0001_two_sum;
diff --git a/src/solution/s0001_two_sum.rs b/src/solution/s0001_two_sum.rs
new file mode 100644
index 0000000..bf5203c
--- /dev/null
+++ b/src/solution/s0001_two_sum.rs
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+/**
+ * [1] Two Sum
+ *
+ * Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.
+ * You may assume that each input would have exactly one solution, and you may not use the same element twice.
+ * You can return the answer in any order.
+ *  
+ * <strong class="example">Example 1:
+ * 
+ * Input: nums = [2,7,11,15], target = 9
+ * Output: [0,1]
+ * Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].
+ * 
+ * <strong class="example">Example 2:
+ * 
+ * Input: nums = [3,2,4], target = 6
+ * Output: [1,2]
+ * 
+ * <strong class="example">Example 3:
+ * 
+ * Input: nums = [3,3], target = 6
+ * Output: [0,1]
+ * 
+ *  
+ * Constraints:
+ * 
+ * 	2 <= nums.length <= 10^4
+ * 	-10^9 <= nums[i] <= 10^9
+ * 	-10^9 <= target <= 10^9
+ * 	Only one valid answer exists.
+ * 
+ *  
+ * Follow-up: Can you come up with an algorithm that is less than O(n^2)<font face="monospace"> </font>time complexity?
+ */
+pub struct Solution {}
+
+// problem: https://leetcode.cn/problems/two-sum/
+// discuss: https://leetcode.cn/problems/two-sum/discuss/?currentPage=1&orderBy=most_votes&query=
+
+// submission codes start here
+
+use std::collections::HashMap;
+impl Solution {
+    pub fn two_sum(nums: Vec<i32>, target: i32) -> Vec<i32> {
+        let mut map = HashMap::with_capacity(nums.len());
+
+        for (index, value) in nums.iter().enumerate() {
+            match map.get(&(target - value)) {
+                None => {
+                    map.insert(value, index);
+                }
+                Some(target_index) => {
+                    return vec![*target_index as i32, index as i32];
+                }
+            }
+        }
+
+        vec![]
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_1() {
+        assert_eq!(vec![0, 1], Solution::two_sum(vec![2, 7, 11, 15], 9));
+        assert_eq!(vec![1, 2], Solution::two_sum(vec![3, 2, 4], 6));
+    }
+}