Add .clang-format and apply it

2020/puzzle-06-01.cc

@@ -5,7 +5,8 @@
 
 // Merge two strings of answers, preserving order and ensuring uniqueness of
 // each answer.
-std::string merge_answers(std::string const &a, std::string const &b) {
+std::string merge_answers(std::string const& a, std::string const& b)
+{
   std::string result;
   std::string::size_type pos_a = 0;
   std::string::size_type pos_b = 0;
@@ -13,10 +14,12 @@ std::string merge_answers(std::string const &a, std::string const &b) {
     if (a[pos_a] < b[pos_b]) {
       result += a[pos_a];
       ++pos_a;
-    } else if (b[pos_b] < a[pos_a]) {
+    }
+    else if (b[pos_b] < a[pos_a]) {
       result += b[pos_b];
       ++pos_b;
-    } else {
+    }
+    else {
       assert(a[pos_a] == b[pos_b]);
       result += a[pos_a];
       ++pos_a;
@@ -29,23 +32,22 @@ std::string merge_answers(std::string const &a, std::string const &b) {
   return result;
 }
 
-int main(int argc, char **argv) {
-
+int main(int argc, char** argv)
+{
   std::string current_answers;
   unsigned count = 0;
   for (std::string line; std::getline(std::cin, line);) {
     if (!line.empty()) {
       std::sort(line.begin(), line.end());
       current_answers = merge_answers(current_answers, line);
-    } else {
-      std::cout << "Length of " << current_answers << " = "
-                << current_answers.length() << "\n";
+    }
+    else {
+      std::cout << "Length of " << current_answers << " = " << current_answers.length() << "\n";
       count += current_answers.length();
       current_answers.clear();
     }
   }
-  std::cout << "Length of " << current_answers << " = "
-            << current_answers.length() << "\n";
+  std::cout << "Length of " << current_answers << " = " << current_answers.length() << "\n";
   count += current_answers.length();
 
   std::cout << "Total length = " << count << "\n";