input:

10000
15 14
13 12
5 4
9 8
11 12
15 14
10 9
14 13
2 3
2 1
6 5
10 11
3 4
7 6
8 7
6 5
2 1
2 4
4 6
2 3
3 5
10 9
8 3
9 4
5 6
5 10
3 2
5 4
2 7
1 2
4 3
2 1
2 1
2 1
2 1
9 8
9 8
5 4
1 2
6 5
3 4
3 2
7 8
7 6
2 1
1 2
14 13
3 10
5 6
2 9
11 4
2 3
2 1
8 7
13 6
5 4
5 12
6 7
4 3
7 14
16 15
2 3
2 1
6 10
6 9
6 4
9 11
...

output:

4
5 9 13 15 
2
6 6 
2
9 6 
1
2 
1
2 
3
4 7 9 
1
2 
2
11 8 
3
6 15 16 
1
14 
4
6 11 16 20 
2
4 8 
2
5 10 
2
10 16 
1
4 
4
5 9 13 15 
2
7 7 
1
2 
2
5 9 
1
5 
2
3 4 
2
4 8 
2
11 14 
2
12 18 
1
3 
4
5 9 13 15 
2
4 4 
3
12 16 16 
2
3 3 
1
6 
5
6 11 16 21 21 
2
12 11 
2
5 14 
3
9 16 16 
1
4 
2
4 6 
2
4 6 ...

result:

wrong answer Condition failed: "subset.size() == sz" (test case 2)