Question

How to change the first element in deque in C++

Answer 1

#include <iostream>
#include <deque> 
  
int main ()
{
    std::deque<int> dq = {5, 2, 9, 12, 7, 1, 8}; 
    
    std::deque<int>::iterator it = dq.begin();
    *it = 100;
    for (int &n : dq) std::cout << n << ", ";
    
    std::cout << "\n";
    
    dq[0] = 33;
    for (int &n : dq) std::cout << n << ", ";
  
    return 0;
}
    
    
    
/*
run:
    
100, 2, 9, 12, 7, 1, 8, 
33, 2, 9, 12, 7, 1, 8, 
     
*/

 

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