A_MAD_Interactive_Problem.cpp

#include <bits/stdc++.h>
using namespace std;

int query(vector<int> &temp) {
    cout << "? " << temp.size() << " ";
    for(auto &ele : temp) cout << ele << " ";
    cout << endl;
    int num;
    cin >> num;
    return num;
}

void solve() {
    int n;
    cin >> n;
    vector<int> arr(2*n + 1);
    
    vector<int> temp;
    vector<int> t2;
    for(int i=1;i<=2*n;i++) {
        temp.push_back(i);
        int num = query(temp);
        if(num != 0) {
            arr[i] = num;
            t2.push_back(i);
            temp.pop_back();
        }
    }
    for(int i=1;i<=2*n;i++) {
        if(arr[i] == 0) {
            t2.push_back(i);
            int num = query(t2);
            arr[i] = num;
            t2.pop_back();
        }
    }

    // for(auto i : temp) cout << i << " "; cout << endl;
    // for(auto i : t2) cout << i << " "; cout << endl;
    
    cout << "! ";
    for(int i=1;i<=2*n;i++) cout << arr[i] << " ";
    cout << endl;


}


int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int _;
    cin >> _;
    while (_-->0) {
        solve();
    }

    return 0;
}