day 2 part 2 solution

Author: baton

02/2.cpp

@@ -0,0 +1,55 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <map>
+#include <numeric>
+#include <algorithm>
+#include <iterator>
+
+
+struct line_t : std::string
+{};
+
+std::istream & operator>>( std::istream & is, line_t & line )
+{
+	return std::getline( is, line );
+}
+
+std::map< std::string, uint64_t > table
+{
+	{ "A X", 3 },
+	{ "A Y", 4 },
+	{ "A Z", 8 },
+	{ "B X", 1 },
+	{ "B Y", 5 },
+	{ "B Z", 9 },
+	{ "C X", 2 },
+	{ "C Y", 6 },
+	{ "C Z", 7 }
+};
+
+
+int main( int argc, char * argv[] )
+{
+	if( argc < 2 )
+		return 0;
+
+	std::ifstream ifs( argv[ 1 ] );
+
+	uint64_t const result{
+		std::transform_reduce(
+			std::istream_iterator< line_t >( ifs ), std::istream_iterator< line_t >(),
+			0ULL,
+			std::plus{},
+			[]( std::string const & s ) -> uint64_t
+			{
+				return table[ s ];
+			}
+		)
+	};
+
+	std::cout << "result = " << result << std::endl;
+
+	return 0;
+}