SET WITH ARRAY

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb push_back
#define ff first
#define ss second
#define pb push_back
#define eb emplace_back
typedef pair<ll,ll>pll;
typedef pair<ll,pair<ll,ll>>plll;
int main()
{


     ll n,m;

     cin>>n;

     set<array<ll,3>>s; // set = arrray =arrray value tyepe= koto D ARRRAY

     for(ll i=0;i<n;i++)
     {
         ll a;
        cin>>a;
        s.insert({a,i,i});

     }

    for(auto x:s)
    {
        cout<<x[0]<<" "<<x[1]<<" "<<x[2]<<endl;
    }




}




...........................



#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define pb push_back
#define ff first
#define ss second
#define pb push_back
#define eb emplace_back
typedef pair<ll,ll>pll;
typedef pair<ll,pair<ll,ll>>plll;
int main()
{


     ll n,m;

     cin>>n;

     set<array<ll,5>>s;

     for(ll i=0;i<n;i++)
     {
         ll a,b,c,d,e;
        cin>>a>>b>>c>>d>>e;
        s.insert({a,b,c,d,e});

     }

     cout<<s.size()<<endl;
}
3
1 2 3 4 5
1 2 3 4 5
1 2 3 5 4
2