Added older advents

advent_of_code_2015/day1/main1.cc

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+#include <algorithm>
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main()
+{
+    string buffer;
+
+    while(getline(cin, buffer))
+    {
+        int up = count(buffer.begin(), buffer.end(), '(');
+        int down = count(buffer.begin(), buffer.end(), ')');
+
+        cout << "Floor: " << up - down << "\n";
+    }
+}