Question

How to put a copy of a vector at the end of a vector in C++

Answer 1

#include <iostream>
#include <vector>
 
int main() {
    std::vector<int> vec{1, 2, 3, 4, 5};
    const std::size_t size = vec.size(); 
    
    for (std::size_t i = 0; i < size; i++) {
        vec.push_back(vec[i]);
    }
    
    for (auto val: vec) {
        std::cout << val << ' ';
    }
}
  
  
  
  
/*
run:
  
1 2 3 4 5 1 2 3 4 5 
  
*/

 

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