Question

How to insert an element at specific position in deque with C++

Answer 1

#include <iostream> 
#include <deque> 
 
void printdq(std::deque <int> dq) { 
    for (auto &n: dq)
        std::cout << n << ", ";
    std::cout << '\n'; 
} 
 
int main() 
{ 
    std::deque<int> dq = { 5, 2, 9, 12, 7, 9, 13, 89 }; 
     
    printdq(dq);
     
    int position  = 2; 
    dq.emplace(dq.begin() + position, 100);

    printdq(dq);
   
    return 0; 
} 
   
   
   
/*
run:
   
5, 2, 9, 12, 7, 9, 13, 89, 
5, 2, 100, 9, 12, 7, 9, 13, 89, 
   
*/

 

 

70+ SQL courses for beginners and professionals

Answer 2

#include <iostream> 
#include <deque> 
  
void printdq(std::deque <int> dq) { 
    for (auto &n: dq)
        std::cout << n << ", ";
    std::cout << '\n'; 
} 
  
int main() 
{ 
    std::deque<int> dq = { 5, 2, 9, 12, 7, 9, 13, 89 }; 
      
    printdq(dq);
      
    int position  = 2; 
    dq.insert(dq.begin() + position, 300);
 
    printdq(dq);
    
    return 0; 
} 
    
    
    
/*
run:
    
5, 2, 9, 12, 7, 9, 13, 89, 
5, 2, 300, 9, 12, 7, 9, 13, 89, 
    
*/

 

70+ SQL courses for beginners and professionals