Day 3

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;
+}