2020

2020/1.cpp

@@ -0,0 +1,57 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <vector>
+
+int main()
+{
+    std::ifstream file ("./1i.txt");
+    std::vector<int> input;
+    std::string line;
+    
+    while(std::getline(file, line))
+    {
+        input.push_back(std::stoi(line));
+    }
+
+    int found = 0;
+
+    for (auto& i : input)
+    {
+        for (auto j : input)
+        {
+            if (i + j == 2020)
+            {
+                found = i * j;
+                break;
+            }
+        }
+        if (found != 0)
+            break;
+    }
+
+    std::cout << "Part 1, 2 entries that sum to 2020: " << found << std::endl;
+    found = 0;
+
+    for (auto& i : input)
+    {
+        for (auto j : input)
+        {
+            for (auto k : input)
+            {
+                if (i + j + k == 2020)
+                {
+                    found = i * j * k;
+                    break;
+                }
+            }
+            if (found != 0)
+                break;
+        }
+        if (found != 0)
+            break;
+    }
+    
+    std::cout << "Part 2, 3 entries that sum to 2020: " << found << std::endl;
+
+}