Add .clang-format and apply it

2015/puzzle-19-01.cc

@@ -10,30 +10,31 @@
 #include <string>
 #include <variant>
 
-int main(int argc, char **argv) {
+int main(int argc, char** argv)
+{
   std::multimap<std::string, std::string> replacements;
   bool collecting_replacements = true;
   std::string line;
   while (std::getline(std::cin, line)) {
     if (line.empty()) {
       collecting_replacements = false;
-    } else if (collecting_replacements) {
+    }
+    else if (collecting_replacements) {
       auto sep = line.find(" => ");
       replacements.insert({line.substr(0, sep), line.substr(sep + 4)});
-    } else {
+    }
+    else {
       std::set<std::string> new_molecules;
       for (unsigned pos = 0; pos < line.size(); ++pos) {
         auto [it, ite] = replacements.equal_range(line.substr(pos, 1));
         while (it != ite) {
-          new_molecules.insert(line.substr(0, pos) + it->second +
-                               line.substr(pos + 1));
+          new_molecules.insert(line.substr(0, pos) + it->second + line.substr(pos + 1));
           ++it;
         }
         if (pos < line.size() - 1) {
           auto [it, ite] = replacements.equal_range(line.substr(pos, 2));
           while (it != ite) {
-            new_molecules.insert(line.substr(0, pos) + it->second +
-                                 line.substr(pos + 2));
+            new_molecules.insert(line.substr(0, pos) + it->second + line.substr(pos + 2));
             ++it;
           }
         }