problem_difficulties.cpp

#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main() {
    int t; cin >> t;
    while(t--) {
    // int a1, a2, a3, a4;
    // cin >> a1 >> a2 >> a3 >> a4;
    // // if(a1 == a2 == a3 == a4)cout << "0" << endl;

    // // if(a1!=a2 && a3!=a4)cout<< "2" << endl;
    // if(a1!=a2!=a3!=a4)cout <<"2"<<endl;
    // else if(a1==a2 && a3!=a4)cout<<"1"<<endl;
    // else if(a1!=a2 && a3==a4)cout<<"1"<<endl;
    // else if(a1!=a4 && a2!=a3)cout<< "2"<<endl;
    // else if(a1!=a3 && a2!=a4)cout<<"2"<<endl;
    // else cout << "0" << endl;
    int arr[4]={'0'};
    int n = sizeof(arr) / sizeof(arr[0]);
    sort(arr, arr + n);
    for (int i = 0; i < n; ++i) {
        cin >> arr[i];
    }

        if(arr[0]==arr[1] && arr[1]==arr[2] && arr[2]==arr[3])cout << "0" << endl;
        else if(arr[0]==arr[1]&&arr[1]==arr[2] || arr[1]==arr[2]&&arr[2]==arr[3])cout<<"1"<<endl;
        else cout <<"2"<<endl;
    }



}