Initial commit

2020/puzzle-01-01.cc

@@ -0,0 +1,18 @@
+#include <iostream>
+#include <string>
+#include <vector>
+
+int main(int argc, char **argv) {
+  std::vector<int> vals;
+  for (std::string line; std::getline(std::cin, line);) {
+    int val = std::stoi(line, nullptr, 10);
+    for (auto v : vals) {
+      if (v + val == 2020) {
+        std::cout << v << " * " << val << " = " << v * val << "\n";
+      }
+    }
+    vals.push_back(val);
+  }
+
+  return 0;
+}