add: 230228-CN

cpp/2302/230228-CN.cpp

@@ -0,0 +1,30 @@
+#include <vector>
+#include <map>
+
+/**
+ * 2363. Merge Similar Items
+ *
+ * You are given two 2D integer arrays, items1 and items2, representing two sets of items. Each array items has the following properties:
+ *
+ * items[i] = [valuei, weighti] where valuei represents the value and weighti represents the weight of the ith item.
+ * The value of each item in items is unique.
+ * Return a 2D integer array ret where ret[i] = [valuei, weighti], with weighti being the sum of weights of all items with value valuei.
+ *
+ * Note: ret should be returned in ascending order by value.
+ */
+
+class Solution {
+public:
+    static std::vector<std::vector<int>> mergeSimilarItems(const std::vector<std::vector<int>>& items1, const std::vector<std::vector<int>>& items2) {
+        std::map<int, int> m;
+        for (const auto &item: items1)
+            m[item[0]] += item[1];
+        for (const auto &item: items2)
+            m[item[0]] += item[1];
+        std::vector<std::vector<int>> ret;
+        std::transform(m.begin(), m.end(), std::back_inserter(ret), [](const auto& x) {
+            return std::vector<int>{x.first, x.second};
+        });
+        return ret;
+    }
+};

cpp/2302/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2302)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2302 230221.cpp)
+ADD_EXECUTABLE(2302 230228-CN.cpp)