init commit

contests/6contest/1.cpp

@@ -0,0 +1,21 @@
+#include <iterator>
+
+template <typename Container>
+typename Container::value_type process(const Container& container) {
+    using ValueType = typename Container::value_type;
+
+    if (container.empty()) {
+        return ValueType{};
+    }
+
+    auto it = container.rbegin();
+    ValueType sum = *it;
+
+    for (int i = 0; it != container.rend() && i < 5; ++i, ++it) {
+        if (i == 2 || i == 4) {
+            sum += *it;
+        }
+    }
+
+    return sum;
+}