1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
#include<bits/stdc++.h>
using namespace std;

const int MAXN = 1000;
const int MAX_DEG = 3000;

int n,m;
vector<pair<int,int>> g[MAXN];
set<pair<int,int>> S;
int deg[MAXN];
bool marked[MAXN];
int diff[MAXN];
bool in_result[MAXN];

bool backtrack(int);

inline void mark(int v) {
	marked[v] = true;
	for(auto [u,k] : g[v]) {
		deg[u] -= k;
		diff[u]--;
	}
	m -= deg[v];
}

inline void unmark(int v) {
	marked[v] = false;
	for(auto [u,k] : g[v]) {
		deg[u] += k;
		diff[u]++;
	}
	m += deg[v];
}

inline bool step(int v, int t) {
	mark(v);
	bool res = backtrack(t-1);
	unmark(v);

	return res;
}

bool backtrack(int t) {
	if(m == 0) return true;
	if(t == 0) return false;

	int c = (m+t-1)/t;
	int md = 0, v = -1;

	for(int i=0;i<n;i++)
		if(deg[i] >= md && !marked[i])
			md = deg[i], v = i;

	if(md < c) return false;

	{
		mark(v);
		bool res = backtrack(t-1);
		unmark(v);

		if(res) {
			in_result[v] = true;
			return true;
		}
	}

	if(diff[v] > t) return false;

	{
		vector<int> c;
		for(auto [u,k] : g[v])
			if(!marked[u]) c.push_back(u);

		for(int u : c)
			mark(u), t--;

		bool res = backtrack(t);
	
		for(int u : c)
			unmark(u), t--;

		if(res) {
			for(int u : c)
				in_result[u] = true;					
			return true;
		}
	}

	return false;
}

void query() {
	int k;
	cin >> n >> m >> k;

	for(int i=0;i<n;i++)
		g[i].clear();
	for(int i=0;i<n;i++)
		marked[i] = false, in_result[i] = false;

	for(int i=0;i<m;i++) {
		int v,u;
		cin >> v >> u, v--, u--;
		g[v].push_back({u,1});
		g[u].push_back({v,1});
	}

	for(auto& x : g) {
		sort(x.begin(), x.end());
		vector<pair<int,int>> y;

		if(!x.empty())
			y.push_back({x[0].first, 0});

		for(auto [a,b] : x)
			if(y.back().first != a) y.push_back({a,b});
			else y.back().second++;

		x = y;
	}

	for(int v=0;v<n;v++) {
		deg[v] = 0;
		for(auto [u,k] : g[v])
			deg[v] += k;
		diff[v] = g[v].size();
	}

	for(int t=1;t<=k;t++)
		if(backtrack(t)) {
			vector<int> cands;
			for(int v=0;v<n;v++)
				if(in_result[v])
					for(auto [u,k] : g[v])
						cands.push_back(u);
			sort(cands.begin(), cands.end());
			cands.resize(unique(cands.begin(), cands.end()) - cands.begin());

			vector<int> result;
			for(int v : cands)
				if(in_result[v] || step(v,t))
					in_result[v] = true;

			for(int i=0;i<n;i++)
				if(in_result[i]) result.push_back(i);

			cout << t << " " << result.size() << "\n";
			for(int i : result)
				cout << i+1 << " ";
			cout << "\n";
			return;
		}

	cout << "-1\n";
}

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

	int q;
	cin >> q;

	while(q--)
		query();

	return 0;
}