#include <stdio.h>
#include <math.h>
typedef struct point point;

struct point {
   int x;
   int y;
   int z; };

void fnc(struct point arr[], int k, int *w1,int *w2)
{int i, j;
double dist, t;
for(i=0; i<k-1 ;i++){
    for (j=i+1; j<k;j++){
        if((t=sqrt(
        pow((arr[j].x - arr[i].x), 2)+
        pow((arr[j].y - arr[i].y), 2)+
        pow((arr[j].z - arr[i].z), 2) ))>dist){
            dist = t;
            printf("dist %lf i:%d j:%d\n",dist,i,j);
            *w1=i;
            *w2=j;
        }
        }
    }
}
int main ()
{
int w1,w2 ;
struct point arr[7] =
{
{1,2,3},
{3,5,7},
{4,2,3},
{5,1,7},
{6,2,3},
{1,6,3},
{1,5,3}
};
fnc(arr,7,&w1,&w2);
printf("najdalsze punkty to %d %d",w1,w2);

return 0;
}