Added older advents

advent_of_code_2015/day1/main2.cc

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+#include <algorithm>
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+int main()
+{
+    string buffer;
+
+    while(getline(cin, buffer))
+    {
+        int floor = 0;
+        
+        for (size_t idx = 0; idx != buffer.size(); ++idx)
+        {
+            floor += buffer[idx] == '(' ? 1 : -1;
+            if (floor == -1)
+            {
+                cout << "Entered basement in step " << idx + 1 << "\n";
+                return 0;
+            }
+        }
+
+        
+    }
+}