feat: complete part 1 of 2020-12-01 Advent of Code

day_1/.gitignore

@@ -0,0 +1,2 @@
+/.idea
+/cmake-build-debug

day_1/CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.19)
+project(day_1)
+
+set(CMAKE_CXX_STANDARD 20)
+
+add_executable(day_1 main.cpp)

day_1/input.txt

@@ -0,0 +1,200 @@
+1140
+1736
+1711
+1803
+1825
+1268
+1651
+2007
+1923
+1661
+1788
+1876
+2003
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+1815
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+1960
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+1897
+633
+1708
+1606
+515
+1397
+1873
+1374
+1969
+1918
+1170
+1660
+1494
+1764
+2002
+1938
+1396
+1926
+1714
+1659
+1805
+1593
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+1850
+1644
+1877
+1561
+1895
+1985
+1353
+395
+1919
+1522
+1745
+1721
+901
+1765
+1939
+2009
+1949
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+1749
+1675
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+867
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+1729
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+823
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+1814
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+1363
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+1341
+1282
+1989
+1854
+1395
+1847
+1900
+1913
+1777
+1779
+1333
+1800
+1966
+1543
+1882
+1375
+1811
+1673
+1679
+889
+1670
+1879
+1312
+1741
+1772
+1663
+1776
+1642
+1674
+1472
+1580
+1264
+1738
+1999
+1637

day_1/main.cpp

@@ -0,0 +1,25 @@
+#include <iostream>
+#include <fstream>
+#include <vector>
+
+int main() {
+    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) {
+            if (i + j == 2020) {
+                std::cout << (i * j) << std::endl;
+            }
+        }
+    }
+
+    return 0;
+}