2 files changed, 5 insertions, 3 deletions
diff --git a/src/2020/day1/aoc.cpp b/src/2020/day1/aoc.cpp
index 87972e7..ab8e2f4 100644
--- a/src/2020/day1/aoc.cpp
+++ b/src/2020/day1/aoc.cpp
@@ -26,13 +26,15 @@ int two_sum(const std::vector<int>& is, int target) {
   return 0;
 }
 
-int day1(line_view file, int target) {
+int three_sum(const std::vector<int>& is, int target) { return 0; }
+
+std::pair<int, int> day1(line_view file, int target) {
   std::vector<int> is;
   per_line(file, [&is](line_view lv) {
     is.emplace_back(get_number(lv.line));
     return true;
   });
-  return two_sum(is, target);
+  return {two_sum(is, target), three_sum(is, target)};
 }
 
 } // namespace aoc2020
diff --git a/src/2020/day1/aoc.h b/src/2020/day1/aoc.h
index d876d13..d573fb6 100644
--- a/src/2020/day1/aoc.h
+++ b/src/2020/day1/aoc.h
@@ -3,5 +3,5 @@
 
 namespace aoc2020 {
 
-int day1(line_view, int);
+std::pair<int, int> day1(line_view, int);
 }