1b

1.cpp

@@ -14,11 +14,15 @@ int main()
 		bs.insert(b);
 	}
 
-	int total{};
+	int distance{};
+	int similarity{};
+
 	for (auto ia = as.cbegin(), ib = bs.cbegin(); ia != as.end(); ++ia, ++ib)
 	{
-		total += std::abs(*ia - *ib);
+		distance += std::abs(*ia - *ib);
+		similarity += *ia * bs.count(*ia);
 	}
-	std::cout << total << "\n";
+	std::cout << "Total difference: " << distance << "\n";
+	std::cout << "Total distance:   " << similarity << "\n";
 	return 0;
 }

Makefile

@@ -3,7 +3,7 @@ RM=rm -rf
 CXXFLAGS=-g -Wall -Wextra -pedantic -std=c++20
 BUILD=build
 MKDIR=mkdir
-EXES=1a
+EXES=1
 
 $(EXES): %: %.cpp
 	$(CXX) $(CXXFLAGS) $^ -o $@