Thrust How could i acces my flatten array with a thrust::make_zip_iterator

Question

Could some one could explain me why i can't access to my data.

I got a flatten vector

thrust::host_vector<double> input(10*3);

inside i have points data X,Y,Z

i make try to use a zip_iterator to access to my data so i make :

typedef thrust::tuple<double, double, double, int>  tpl4int;
typedef thrust::host_vector<double>::iterator doubleiter;
typedef thrust::host_vector<int>::iterator intiter;

typedef thrust::tuple<doubleiter, doubleiter, doubleiter, intiter>  tpl4doubleiter;
typedef thrust::zip_iterator<tpl4doubleiter>  tpl4zip;

tpl4zip first = thrust::make_zip_iterator(thrust::make_tuple(input.begin(), input.begin() + N/3, input.begin() + 2*N/3, K.begin()));

I try to acces to my data like this :

  std::vector<tpl4int> result_sorted(N);
  thrust::copy(first,first+N/3,result_sorted.begin());  

  std::cout << "row 0 = " << result_sorted[0].get<0>() << std::endl;
  std::cout << "row 1 = " << result_sorted[0].get<1>() << std::endl;
  std::cout << "row 2 = " << result_sorted[0].get<2>() << std::endl;
  std::cout << "row 0 = " << result_sorted[0].get<3>() << std::endl;

but i didn't get the expected result

X = 1.0245
Y = 1.0215
Z = 5.001
index = 0

instead of

      input[0] = 1.0245;
      input[1] = 2.54;
      input[2] = 3.001;
      index    = 0;

could someone tell my where i'm wrong ?

here the full code

#include <thrust/host_vector.h>
#include <thrust/iterator/zip_iterator.h>
#include <thrust/sequence.h>
#include <thrust/fill.h>
#include <thrust/tuple.h>

#define N 30 // make this evenly divisible by 3 for this example

typedef thrust::tuple<double, double, double, int>  tpl4int;
typedef thrust::host_vector<double>::iterator doubleiter;
typedef thrust::host_vector<int>::iterator intiter;

typedef thrust::tuple<doubleiter, doubleiter, doubleiter, intiter>  tpl4doubleiter;
typedef thrust::zip_iterator<tpl4doubleiter>  tpl4zip;

int main() 
{
   thrust::host_vector<double> input(10*3);

      int i=0;

//     input[0] = vec3(0,0,5.005);
      input[i++] = 1.0245;
      input[i++] = 2.54;
      input[i++] = 3.001;

//     input[1] = vec3(0,0,5.005);
      input[i++] = 2.0;
      input[i++] = 1.0;
      input[i++] = 5.01125;

//     input[2] = vec3(0,0,5.005);
      input[i++] = 6.0;
      input[i++] = 1.0;
      input[i++] = 5.0145;

    
//     input[3] = vec3(2,1,5.001);
      input[i++] = 6.0;
      input[i++] = 1.0215;
      input[i++] = 6.001;

//     input[4] = vec3(3,0,5.001);
      input[i++] = 6.0;
      input[i++] = 1.0845;
      input[i++] = 5.00125;

//     input[5] = vec3(4,0,5.001);
      input[i++] = 5.0;
      input[i++] = 0.0;
      input[i++] = 5.001;
    
//     input[6] = vec3(5,0,5.001);
      input[i++] = 5.0;
      input[i++] = 0.0;
      input[i++] = 5.001;

//     input[7] = vec3(6,0,10.501);
      input[i++] = 6.0;
      input[i++] = 0.0;
      input[i++] = 10.501;

//     input[8] = vec3(0,0,5.001);
      input[i++] = 1.0;
      input[i++] = 0.0;
      input[i++] = 5.0015478;

//     input[8] = vec3(0,0,5.001);
      input[i++] = 6.0;
      input[i++] = 1.005;
      input[i++] = 5.001;
      

  thrust::host_vector<int> K(N/3);          // keys in one row
  thrust::sequence(K.begin(), K.end(), 0);  // set index for key

  tpl4zip first = thrust::make_zip_iterator(thrust::make_tuple(input.begin(), input.begin() + N/3, input.begin() + 2*N/3, K.begin()));

  std::vector<tpl4int> result_sorted(N/3);
  thrust::copy(first,first+N/3,result_sorted.begin());  

  std::cout << "row 0 = " << result_sorted[0].get<0>() << std::endl;
  std::cout << "row 1 = " << result_sorted[0].get<1>() << std::endl;
  std::cout << "row 2 = " << result_sorted[0].get<2>() << std::endl;
  std::cout << "row 0 = " << result_sorted[0].get<3>() << std::endl;

  return 0;
}

Thanks in advance..