diff --git a/main.cpp b/main.cpp
index d76cce7..82a85a5 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,9 +1,10 @@
 #include <iostream>
-#include <vector>
 #include <variant>
+#include <vector>
 
 // 请修复这个函数的定义：10 分
-std::ostream &operator<<(std::ostream &os, std::vector<T> const &a) {
+template <class T>
+std::ostream& operator<<(std::ostream& os, std::vector<T> const& a) {
     os << "{";
     for (size_t i = 0; i < a.size(); i++) {
         os << a[i];
@@ -16,19 +17,48 @@ std::ostream &operator<<(std::ostream &os, std::vector<T> const &a) {
 
 // 请修复这个函数的定义：10 分
 template <class T1, class T2>
-std::vector<T0> operator+(std::vector<T1> const &a, std::vector<T2> const &b) {
+auto operator+(std::vector<T1> const& a, std::vector<T2> const& b) {
     // 请实现列表的逐元素加法！10 分
     // 例如 {1, 2} + {3, 4} = {4, 6}
+    using T0 = decltype(T1{} + T2{});
+    int n = std::min(a.size(), b.size());
+    std::vector<T0> res(n);
+    for (int i = 0; i < n; ++i) {
+        res[i] = a[i] + b[i];
+    }
+    return res;
 }
 
 template <class T1, class T2>
-std::variant<T1, T2> operator+(std::variant<T1, T2> const &a, std::variant<T1, T2> const &b) {
+std::variant<T1, T2> operator+(std::variant<T1, T2> const& a, std::variant<T1, T2> const& b) {
     // 请实现自动匹配容器中具体类型的加法！10 分
+    return std::visit([&](const auto& aa, const auto& bb)
+                          -> std::variant<T1, T2> {
+        return aa + bb;
+    },
+                      a, b);
+}
+
+template <class T1, class T2>
+std::variant<T1, T2> operator+(const std::variant<T1, T2>& a, const T2& b) {
+    std::variant<T1, T2> bb = b;
+    return a + bb;
+}
+
+template <class T1, class T2>
+std::variant<T1, T2> operator+(const T1& a, const std::variant<T1, T2>& b) {
+    std::variant<T1, T2> aa = a;
+    return aa + b;
 }
 
 template <class T1, class T2>
-std::ostream &operator<<(std::ostream &os, std::variant<T1, T2> const &a) {
+std::ostream& operator<<(std::ostream& os, std::variant<T1, T2> const& a) {
     // 请实现自动匹配容器中具体类型的打印！10 分
+    return std::visit([&](const auto& t)
+                          -> std::ostream& {
+        return os << t;
+    },
+                      a);
 }
 
 int main() {