Day 3

Day3/part1.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+#include <string>
+#include <algorithm>
+
+using namespace std;
+
+int main(int argc, char* argv[])
+{
+    int total = 0;
+
+    string line;
+    while(getline(cin, line))
+    {
+        string half1 = line.substr(0, line.size()/2);
+        string half2 = line.substr(line.size()/2);
+
+        sort(half1.begin(), half1.end());
+        sort(half2.begin(), half2.end());
+
+        string remaining;
+        set_intersection(half1.begin(), half1.end(), half2.begin(), half2.end(), back_inserter(remaining));
+
+        int value;
+        if (remaining[0] >= 'a')
+        {
+            value = remaining[0]-'a'+1;
+        }
+        else
+        {
+            value = remaining[0]-'A'+27;
+        }
+        
+        total += value;
+    }
+    cout << total << endl;
+}

Day3/part2.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+#include <string>
+#include <algorithm>
+
+using namespace std;
+
+int main(int argc, char* argv[])
+{
+    int total = 0;
+
+    string line1,line2,line3;
+    while(getline(cin, line1))
+    {
+        getline(cin, line2);
+        getline(cin, line3);
+
+        sort(line1.begin(), line1.end());
+        sort(line2.begin(), line2.end());
+        sort(line3.begin(), line3.end());
+
+        string first_intersection, second_intersection;
+        set_intersection(line1.begin(), line1.end(), line2.begin(), line2.end(), back_inserter(first_intersection));
+        set_intersection(first_intersection.begin(), first_intersection.end(), line3.begin(), line3.end(), back_inserter(second_intersection));
+
+        int value;
+        if (second_intersection[0] >= 'a')
+        {
+            value = second_intersection[0]-'a'+1;
+        }
+        else
+        {
+            value = second_intersection[0]-'A'+27;
+        }
+        
+        total += value;
+    }
+    cout << total << endl;
+}

README.md

@@ -4,4 +4,4 @@ Advent of Code for 2022
 
 # Branch format
 
-Uploading code files at partX.cpp in each days folder. Compile the part with `g++ partX.cpp -o partX`. Download your input file as `inptuX` and run the program with `./partX < inputX`.
+Uploading code files at partX.cpp in each day's folder. Compile the part with `g++ partX.cpp -o partX`. Download your input file as `inptuX` and run the program with `./partX < inputX`.