Added day 1 solution.

input/day1.txt

@@ -0,0 +1,100 @@
+136583
+77036
+109200
+142168
+74357
+146941
+129306
+98180
+105195
+129127
+135956
+116070
+89198
+51306
+144552
+109900
+56658
+52478
+115147
+63882
+70342
+98678
+107384
+135359
+87237
+84469
+106477
+104645
+77066
+74143
+76537
+140547
+68128
+116624
+148407
+78276
+117623
+96019
+75825
+75010
+98644
+119641
+139736
+104452
+72599
+63017
+59648
+126163
+69629
+79080
+92195
+58221
+134276
+80301
+89870
+146799
+145702
+138367
+131977
+56781
+85326
+138115
+70241
+60454
+76934
+119321
+93493
+123047
+149941
+141729
+70141
+134525
+93312
+92043
+79582
+115959
+51058
+94686
+70749
+99408
+118560
+95821
+58995
+94906
+98421
+118673
+83575
+83434
+63884
+70575
+134177
+116233
+113954
+52829
+123860
+128020
+126718
+144463
+140192
+143461

src/day1.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <vector>
+#include <cmath>
+
+int main()
+{
+    std::string line;
+    std::ifstream input_file("../input/day1.txt");
+
+    auto part1_sum = 0;
+    auto part2_sum = 0;
+
+    if (input_file.is_open())
+    {
+        while (getline(input_file, line))
+        {
+            auto val = std::stoi(line);
+            auto calculated_value = std::floor(val / 3) - 2;
+
+            part1_sum += calculated_value;
+            while (calculated_value > 0)
+            {
+                part2_sum += calculated_value;
+                calculated_value = std::floor(calculated_value / 3) - 2;
+            }
+        }
+        input_file.close();
+    }
+
+    std::cout << "Part 1 Sum: " << part1_sum << std::endl;
+    std::cout << "Part 2 Sum: " << part2_sum << std::endl;
+
+    return 0;
+}