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#include<iostream>
#include<vector>
template<typename T>
std::vector<T> duplicate_zeros(std::vector<T> &vec)
{
std::vector<T> ret{};
for(const auto& e : vec)
{
if(ret.size() == vec.size()) break;
if(e == 0)
{
ret.emplace_back(0);
ret.emplace_back(0);
}
else ret.emplace_back(e);
}
return ret;
}
template<typename T>
std::ostream &operator<<(std::ostream &os,
const std::vector<T>& vec)
{
for(const auto &e : vec) os << e << ' ';
os << "\n";
return os;
}
int main()
{
std::vector<int> vec1{1,0,2,3,0,4,5,0},vec2{1,2,3},vec3{0,3,0,4,5};
std::cout << duplicate_zeros<int>(vec1);
std::cout << duplicate_zeros<int>(vec2);
std::cout << duplicate_zeros<int>(vec3);
return 0;
}
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