feat: complete part 2 of 2020-12-01 Advent of Code

day_1/main.cpp

@@ -2,10 +2,17 @@
 #include <fstream>
 #include <vector>
 
+int part_1();
+int part_2();
+
 int main() {
+    part_1();
+    part_2();
+}
+
+int part_1() {
     std::vector<int> vector;
     std::ifstream input("../input.txt");
-
     std::string line;
 
     while(std::getline(input, line)) {
@@ -17,9 +24,36 @@ int main() {
         for (int j : vector) {
             if (i + j == 2020) {
                 std::cout << (i * j) << std::endl;
+                return 0;
             }
         }
     }
 
-    return 0;
+    return 1;
 }
+
+
+int part_2() {
+    std::vector<int> vector;
+    std::ifstream input("../input.txt");
+    std::string line;
+
+    while(std::getline(input, line)) {
+        int num = std::stoi(line);
+        vector.push_back(num);
+    }
+
+    for (int i : vector) {
+        for (int j : vector) {
+            for (int k : vector) {
+                if (i + j + k == 2020) {
+                    std::cout << (i * j * k) << std::endl;
+                    return 0;
+                }
+            }
+        }
+    }
+
+    return 1;
+}
+