c++ - Deque Implementation -

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I have a question about the code found on the Internet that uses the deck to get the maximum of the element - < / P> 

  #include & lt; Iostream & gt; #include & lt; Deque & gt; using namespace std; Zero Test (Ent Ar [], Int N) {std :: deque & lt; Int & gt; Qi (N); Int i; For (i = 0; i & lt; n; ++ i) {while ((qi.mpt)) and arr [i]> gt; = arr [qi back]) kupp_back (); // Remove from Qi.push_back (i); } Cout & lt; & Lt; Arrivals [Qi.front ()]; } // To test the driver program for work, int main () {int arr [] = {12, 1, 78, 90, 57, 89, 56}; Int n = sizeof (arr) / sizeof (ARE [0]); Test (ARM, N); Return 0; }   
 My question is how is Qi.front () giving the correct index when I have not done any Qi.push_front ()?  
 But the following code will give me a 0  
  zero test (ent ar), int n {std :: deque & lt; Int & gt; Qi (N); Int i; {Qi.push_back (i) for (i = 0; i & lt; n; ++ i); } Cout & lt; & Lt; Arrivals [Qi.front ()];    
 Sorry, if I'm feeling stupid .. for new people ...  
 thanks   < P> 
 
  stud :: deck & lt; Int & gt; Qi (N);   n  creates a deck with elements, all zeros  push_back  operations add further elements on the back, so the deck later contains the  2 * n  element  Qi.front ()  is the same  Qi [0] .  
 All this is well documented, e.g. .

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