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#include<iostream>
#include<vector>
#include<algorithm>
template<typename T>
T product(T n)
{
T prod = 1;
while(n)
{
prod *= n % 10;
n /= 10;
}
return prod;
}
template<typename T>
T helper(T n)
{
T sum = 0;
while(n >= 10)
{
sum++;
n = product<T>(n);
}
return sum;
}
template<typename T>
void persistence_sort(std::vector<T>& v)
{
std::sort(v.begin(),v.end(),[](T a, T b){
T ha = helper<T>(a), hb = helper<T>(b);
return ha == hb ? a < b : ha < hb;
});
}
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{15,99,1,34},vec2{50,25,33,22};
persistence_sort(vec1);
persistence_sort(vec2);
std::cout << vec1 << vec2;
return 0;
}
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