Common elements

PROBLEM :

Given three arrays sorted in non-decreasing order, print all common elements in these arrays.

Input:
First line consists of T test cases. First line of every test case consists of 3 integers N1, N2 and N3, denoting the number of elements of 3 arrays. Second, Third and Forth line of every test case conisists of elements of array1, array2 and array3 respectively.

Output:
Single line output, Print the common elements of array. If not possible then print -1.

Constraints:
1<=T<=100
1<=N1,N2,N3<=1000
1<=Ai,Bi,Ci<=1000

Example:
Input:
1
6 5 8
1 5 10 20 40 80
6 7 20 80 100
3 4 15 20 30 70 80 120

Output:
20 80

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;

int greatest(int a,int b,int c){
    int temp=a>b?a:b ;
    return temp>c?temp:c ;
}

int main()
{
int t ;
cin>>t ;
while(t--){
  int x,y,z ;
  cin>>x>>y>>z ;
 
  int a1[x],a2[y],a3[z] ;
  int i ;
  bool flag=true ;
 
  for(i=0;i<x;i++)
       cin>>a1[i] ;
     
  for(i=0;i<y;i++)
       cin>>a2[i] ;
     
  for(i=0;i<z;i++)
       cin>>a3[i] ;
     
  int a,b,c ;
  a=0,b=0,c=0 ;
 
  while(a<x&&(b<y&&c<z)){
      if(a1[a]==a2[b]&&a1[a]==a3[c]){
          cout<<a1[a]<<" " ;
  flag=false ;
          a++,b++,c++ ;
      }
      else{
          if(a1[a]==a2[b]&&a1[a]>a3[c]) c++ ;
          else if(a1[a]==a3[c]&&a1[a]>a2[b]) b++ ;
          else if(a2[b]==a3[c]&&a2[b]>a1[a]) a++ ;
          else{
          if(a1[a]==greatest(a1[a],a2[b],a3[c])){
  b++,c++ ;
}
          else if(a2[b]==greatest(a1[a],a2[b],a3[c])){
  a++,c++ ;
}
          else if(a3[c]==greatest(a1[a],a2[b],a3[c])){
  a++,b++ ;
}
   }
      }
   }
   if(flag) cout<<-1 ;
   cout<<endl ;
}
return 0;
}

--------------------------------------------------------------------------------
SIMPLE c++ IMPLEMENTATION :(Similar)
--------------------------------------------------------------------------------

#include<iostream>
using namespace std;

int greatest(int a,int b,int c){
    int temp=a>b?a:b ;
    return temp>c?temp:c ;
}

int main()
{
int t ;
cin>>t ;
while(t--){
  int x,y,z ;
  cin>>x>>y>>z ;
 
  int a1[x],a2[y],a3[z] ;
  int i ;
  bool flag=true ;
 
  for(i=0;i<x;i++)
       cin>>a1[i] ;
     
  for(i=0;i<y;i++)
       cin>>a2[i] ;
     
  for(i=0;i<z;i++)
       cin>>a3[i] ;
     
  int a,b,c ;
  a=0,b=0,c=0 ;
 
  while(a<x&&(b<y&&c<z)){
      if(a1[a]==a2[b]&&a1[a]==a3[c]){
          cout<<a1[a]<<" " ;
          flag=false ;
          a++,b++,c++ ;
      }
      else if(a1[a]<a2[b])
           a++ ;
      else if(a2[b]<a3[c])
           b++ ;
      else
           c++ ;
   }
  if(flag) cout<<-1 ;
  cout<<endl ;
 
}
return 0;
}

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