Added older advents

advent_of_code_2015/day5/main1.cc

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+#include <algorithm>
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+bool has_forbidden(string const &str)
+{
+    if (str.find("ab") != string::npos) return true;
+    if (str.find("cd") != string::npos) return true;
+    if (str.find("pq") != string::npos) return true;
+    if (str.find("xy") != string::npos) return true;
+    return false;
+}
+
+bool has_repeating(string const &str)
+{
+    for (size_t idx = 0; idx != str.size() - 1; ++idx)
+    {
+        if (str[idx] == str[idx + 1])
+            return true;
+    }
+
+    return false;
+}
+
+bool vowels_ok(string const &str)
+{
+    size_t vowels = 0;
+
+    vowels += count(str.begin(), str.end(), 'a');
+    vowels += count(str.begin(), str.end(), 'e');
+    vowels += count(str.begin(), str.end(), 'i');
+    vowels += count(str.begin(), str.end(), 'o');
+    vowels += count(str.begin(), str.end(), 'u');
+    
+    return vowels >= 3;
+}
+
+int main()
+{
+
+    string buffer;
+    size_t count = 0;
+
+    while(getline(cin, buffer))
+    {
+        cout << "'" << buffer << "'\n";
+
+        if (vowels_ok(buffer)
+            && has_repeating(buffer)
+            && !has_forbidden(buffer))
+        {
+            ++count;
+        }
+    }
+
+    cout << "Nice strings: " << count << "\n";
+}