Input:
- Code: Select all
10
30 40
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
9 10
10 11
11 12
12 13
13 14
14 15
15 16
16 17
17 18
18 19
19 20
20 21
21 22
22 23
23 24
24 25
25 26
26 27
27 28
28 29
29 30
11 13
13 19
19 10
3 7
7 8
8 23
23 3
3 30
29 1
21 8
25 19
9 17
1 8
1 2
1 7
2 9
2 5
2 3
3 4
4 3
3 8
4 5
5 6
5 8
7 6
6 7
6 9
7 8
2 8
9 14
3 1
1 4
2 3
1 2
5 4
4 5
1 7
5 7
6 7
2 6
7 9
8 9
9 8
9 6
0 0
5 0
0 3
0 0
0 0
0 0
1 1
1 1
2 1
2 1
3 2
2 1
1 3
10 20
1 2
2 3
3 4
4 5
5 6
7 6
7 8
7 9
6 2
2 6
9 10
11 10
12 10
13 12
14 11
15 2
16 19
13 17
18 7
7 16
Output:
- Code: Select all
30
8
9
0
0
0
1
2
3
6
Correct?
