init commit

contests/5contest/2.cpp

@@ -0,0 +1,28 @@
+#include <map>
+#include <vector>
+#include <iostream>
+
+int main() {
+    std::map<std::string, std::vector<int>> mp;
+
+    std::string name;
+    int grade;
+    while (std::cin >> name >> grade) {
+        mp[name].push_back(grade);
+    }
+
+    for (auto x : mp) {
+        std::cout << x.first << " ";
+
+        double tmp = 0;
+        int n = 0;
+        for (auto i : x.second) {
+            tmp += i;
+            ++n;
+        }
+
+        std::cout << tmp / n << std::endl;
+    }
+
+    return 0;
+}