title: Efficient way to create array of string
body: <p>I need to create array of string which one will be the more efficient.</p>
  
  <pre><code>1.std::array&lt;std::string, 3&gt;arr  {"aa", "bb", "cc"};
  2.std::vector&lt;std::string&gt; arr = {"aa","bb","cc"};
  3.string arr[3]                = {"aa", "bb", "cc"};
  </code></pre>
  
  <p>Note : All the string(aa,bb,cc) in my case is fixed during initialised time.
        please suggested any other way if any.</p>