QOJ.ac

QOJ

ID题目提交者结果用时内存语言文件大小提交时间测评时间
#719456#1837. HamiltonianmaspyAC ✓14ms10760kbPython313.2kb2024-11-07 01:21:122024-11-07 01:21:13

Judging History

你现在查看的是最新测评结果

  • [2024-11-07 01:21:13]
  • 评测
  • 测评结果:AC
  • 用时:14ms
  • 内存:10760kb
  • [2024-11-07 01:21:12]
  • 提交

answer

data = [[(0, 3), (0, 8), (0, 9), (1, 3), (1, 8), (2, 3), (2, 7), (2, 8), (2, 9), (3, 4), (3, 7), (4, 5), (4, 6), (4, 7), (4, 9), (7, 8), (8, 9), ], [(0, 3), (1, 6), (1, 9), (1, 10), (2, 3), (2, 4), (2, 10), (3, 7), (3, 8), (4, 6), (4, 7), (4, 9), (4, 10), (5, 10), (6, 8), (6, 9), (7, 8), (7, 9), (7, 10), ], [(0, 1), (0, 6), (1, 2), (1, 6), (1, 8), (1, 9), (1, 10), (1, 11), (1, 14), (2, 3), (2, 4), (2, 6), (2, 7), (2, 13), (3, 4), (3, 6), (3, 7), (4, 9), (4, 11), (4, 13), (5, 6), (5, 10), (5, 12), (5, 14), (6, 11), (6, 12), (6, 13), (7, 12), (9, 13), (11, 12), (11, 14), (12, 13), (12, 14), (13, 14), ], [(0, 1), (0, 4), (0, 5), (1, 3), (2, 3), (2, 4), (2, 8), (3, 6), (4, 6), (4, 8), (4, 9), (5, 6), (7, 9), ], [(0, 1), (0, 2), (0, 4), (0, 6), (0, 9), (1, 2), (1, 5), (1, 7), (1, 9), (3, 5), (4, 5), (4, 8), (6, 9), (7, 8), (8, 9), ], [(0, 6), (1, 5), (1, 6), (1, 7), (1, 8), (2, 4), (2, 5), (2, 7), (3, 5), (3, 6), (4, 5), (4, 9), (5, 6), (5, 7), (5, 8), (5, 9), (6, 7), (6, 9), (7, 8), (7, 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N = int(input())

AB = data[N]
E = len(AB)
V = 0
for a, b in AB:
    V = max(V, b + 1)

print(V, E)
for a, b in AB:
    print(a + 1, b + 1)

詳細信息

Test #1:

score: 100
Accepted
time: 3ms
memory: 10720kb

input:

1

output:

11 19
1 4
2 7
2 10
2 11
3 4
3 5
3 11
4 8
4 9
5 7
5 8
5 10
5 11
6 11
7 9
7 10
8 9
8 10
8 11

result:

ok correct

Test #2:

score: 0
Accepted
time: 10ms
memory: 10732kb

input:

2

output:

15 34
1 2
1 7
2 3
2 7
2 9
2 10
2 11
2 12
2 15
3 4
3 5
3 7
3 8
3 14
4 5
4 7
4 8
5 10
5 12
5 14
6 7
6 11
6 13
6 15
7 12
7 13
7 14
8 13
10 14
12 13
12 15
13 14
13 15
14 15

result:

ok correct

Test #3:

score: 0
Accepted
time: 8ms
memory: 10628kb

input:

3

output:

10 13
1 2
1 5
1 6
2 4
3 4
3 5
3 9
4 7
5 7
5 9
5 10
6 7
8 10

result:

ok correct

Test #4:

score: 0
Accepted
time: 14ms
memory: 10568kb

input:

4

output:

10 15
1 2
1 3
1 5
1 7
1 10
2 3
2 6
2 8
2 10
4 6
5 6
5 9
7 10
8 9
9 10

result:

ok correct

Test #5:

score: 0
Accepted
time: 10ms
memory: 10640kb

input:

5

output:

10 20
1 7
2 6
2 7
2 8
2 9
3 5
3 6
3 8
4 6
4 7
5 6
5 10
6 7
6 8
6 9
6 10
7 8
7 10
8 9
8 10

result:

ok correct

Test #6:

score: 0
Accepted
time: 5ms
memory: 10716kb

input:

6

output:

10 15
1 6
2 3
2 4
2 5
2 9
3 10
4 8
5 8
5 9
5 10
6 7
6 8
7 9
8 10
9 10

result:

ok correct

Test #7:

score: 0
Accepted
time: 14ms
memory: 10628kb

input:

7

output:

10 17
1 2
1 4
1 5
1 9
1 10
2 8
2 10
3 4
3 6
3 10
4 5
4 6
4 8
4 10
5 9
6 9
7 9

result:

ok correct

Test #8:

score: 0
Accepted
time: 4ms
memory: 10720kb

input:

8

output:

10 21
1 2
1 3
1 4
1 5
1 6
1 7
1 9
2 3
2 5
2 10
3 6
3 9
3 10
4 7
4 8
5 6
5 10
6 7
6 9
7 9
7 10

result:

ok correct

Test #9:

score: 0
Accepted
time: 11ms
memory: 10544kb

input:

9

output:

11 24
1 3
1 4
2 7
2 9
2 11
3 7
3 9
3 10
4 6
4 8
4 9
4 10
5 8
6 7
6 8
6 9
6 10
6 11
7 8
7 9
7 11
8 10
9 11
10 11

result:

ok correct

Test #10:

score: 0
Accepted
time: 3ms
memory: 10712kb

input:

10

output:

12 30
1 3
2 5
2 8
2 9
2 10
3 6
3 8
3 10
3 12
4 5
4 6
4 8
4 12
5 6
5 7
5 8
5 9
5 10
5 11
6 7
6 9
6 12
7 8
7 11
8 9
8 10
9 10
9 11
9 12
10 11

result:

ok correct

Test #11:

score: 0
Accepted
time: 14ms
memory: 10656kb

input:

11

output:

13 37
1 2
1 6
1 7
1 9
1 10
1 11
2 3
2 4
2 5
2 6
2 9
2 10
2 13
3 6
3 7
3 8
3 11
3 13
4 6
4 8
4 9
4 10
5 6
5 10
5 13
6 7
6 10
6 13
7 8
7 10
7 13
8 9
9 10
9 11
9 13
11 13
12 13

result:

ok correct

Test #12:

score: 0
Accepted
time: 7ms
memory: 10720kb

input:

12

output:

14 42
1 2
1 7
1 8
1 9
1 10
1 12
1 14
2 3
2 4
2 5
2 7
2 8
2 9
2 12
2 13
3 7
3 8
3 10
3 12
4 5
4 6
4 7
4 9
5 6
5 7
5 9
5 10
5 14
6 7
6 8
6 9
6 10
6 12
7 8
7 9
7 14
8 12
9 10
9 13
10 13
11 13
12 13

result:

ok correct

Test #13:

score: 0
Accepted
time: 14ms
memory: 10732kb

input:

13

output:

11 27
1 3
1 4
1 5
1 6
1 7
1 9
1 10
1 11
2 5
2 9
3 5
3 7
3 8
4 5
4 8
4 9
5 6
5 7
5 8
5 9
5 10
5 11
6 8
7 8
7 9
7 10
8 10

result:

ok correct

Test #14:

score: 0
Accepted
time: 2ms
memory: 10716kb

input:

14

output:

16 36
1 3
1 4
1 6
1 12
1 13
2 4
2 6
2 7
2 8
2 9
2 11
3 9
3 12
3 13
3 16
4 9
4 10
4 13
5 13
6 10
6 11
6 14
6 15
7 11
7 12
7 15
8 12
9 16
10 11
10 12
10 14
12 14
12 16
13 15
13 16
14 16

result:

ok correct

Test #15:

score: 0
Accepted
time: 13ms
memory: 10652kb

input:

15

output:

13 25
1 8
1 11
2 3
2 5
2 6
2 7
2 8
2 10
2 11
2 13
3 5
3 9
3 11
3 12
4 5
4 10
5 6
5 8
5 9
5 11
6 9
6 10
7 11
8 12
11 13

result:

ok correct

Test #16:

score: 0
Accepted
time: 9ms
memory: 10596kb

input:

16

output:

15 28
1 4
1 5
1 10
1 12
1 15
2 4
2 11
2 12
2 13
3 4
3 5
4 8
4 9
4 10
4 13
5 7
5 8
5 12
5 13
6 9
6 10
6 11
7 11
8 9
10 11
10 14
10 15
12 14

result:

ok correct

Test #17:

score: 0
Accepted
time: 14ms
memory: 10660kb

input:

17

output:

11 21
1 8
1 10
2 4
2 8
2 9
3 5
3 8
3 10
3 11
4 5
4 9
4 10
5 6
5 7
5 9
5 10
5 11
6 9
6 10
7 8
7 10

result:

ok correct

Test #18:

score: 0
Accepted
time: 11ms
memory: 10620kb

input:

18

output:

12 27
1 2
1 7
2 4
2 5
2 7
2 8
2 10
2 11
3 6
3 9
3 11
3 12
4 7
4 10
5 7
5 8
5 9
5 11
6 7
6 10
7 8
7 9
7 10
7 11
9 10
9 11
10 12

result:

ok correct

Test #19:

score: 0
Accepted
time: 3ms
memory: 10724kb

input:

19

output:

15 32
1 9
1 10
1 11
1 12
2 7
2 8
2 9
2 10
2 12
2 15
3 9
3 13
4 6
4 8
4 10
5 8
5 10
6 8
6 11
6 12
7 11
7 13
7 15
8 10
8 11
8 14
8 15
10 11
10 12
10 14
10 15
11 12

result:

ok correct

Test #20:

score: 0
Accepted
time: 14ms
memory: 10716kb

input:

20

output:

15 26
1 2
1 4
1 9
1 13
1 14
2 3
2 11
2 15
3 5
3 10
4 10
5 6
5 9
5 10
5 12
6 9
6 15
7 11
7 13
8 10
8 11
9 13
9 14
10 12
11 13
13 14

result:

ok correct

Test #21:

score: 0
Accepted
time: 13ms
memory: 10632kb

input:

21

output:

13 26
1 5
1 9
1 11
1 12
2 3
2 4
2 6
2 8
2 10
2 11
2 12
3 8
3 11
4 7
5 7
5 13
6 7
6 8
6 11
7 9
7 12
8 10
9 11
9 13
10 13
11 13

result:

ok correct

Test #22:

score: 0
Accepted
time: 14ms
memory: 10652kb

input:

22

output:

14 24
1 7
1 8
1 10
2 5
2 6
2 7
2 8
2 13
3 4
3 7
3 10
4 9
5 7
5 8
5 12
5 14
6 12
7 10
7 13
9 13
10 11
11 13
12 13
13 14

result:

ok correct

Test #23:

score: 0
Accepted
time: 14ms
memory: 10652kb

input:

23

output:

15 31
1 5
1 7
1 11
1 12
1 13
2 4
2 9
2 11
2 13
3 6
3 10
3 11
4 5
4 7
4 10
4 11
4 14
5 9
5 13
6 7
6 12
7 10
7 12
7 15
8 9
8 13
9 10
9 14
9 15
10 13
11 12

result:

ok correct

Test #24:

score: 0
Accepted
time: 14ms
memory: 10656kb

input:

24

output:

15 38
1 2
1 3
1 4
1 6
1 10
1 14
1 15
2 3
2 4
2 8
2 9
2 11
2 12
2 14
3 4
3 8
3 12
3 15
4 11
4 14
4 15
5 6
5 11
5 15
6 8
6 9
7 13
7 15
8 11
9 11
9 12
9 14
10 12
10 14
10 15
12 14
13 15
14 15

result:

ok correct

Test #25:

score: 0
Accepted
time: 9ms
memory: 10632kb

input:

25

output:

15 24
1 4
1 5
1 9
1 12
1 15
2 4
2 6
2 10
3 6
3 9
3 10
5 8
5 11
6 10
6 11
6 12
6 14
7 8
7 9
7 12
7 13
10 12
13 14
13 15

result:

ok correct

Test #26:

score: 0
Accepted
time: 14ms
memory: 10604kb

input:

26

output:

15 29
1 3
1 7
1 10
1 13
2 5
2 7
3 4
3 5
3 6
3 7
3 9
4 7
4 10
4 11
4 12
5 6
5 13
5 14
5 15
6 10
6 13
7 8
7 11
8 11
8 13
9 15
10 12
10 14
13 14

result:

ok correct

Test #27:

score: 0
Accepted
time: 10ms
memory: 10652kb

input:

27

output:

15 35
1 3
1 6
1 8
1 9
1 11
1 15
2 4
2 5
2 8
2 9
2 10
2 11
3 6
3 13
4 6
4 8
4 13
5 8
5 11
5 13
6 7
6 11
6 13
7 12
8 9
8 14
9 12
9 13
10 12
10 13
11 12
11 14
12 13
13 14
13 15

result:

ok correct

Test #28:

score: 0
Accepted
time: 7ms
memory: 10720kb

input:

28

output:

15 38
1 4
1 5
1 13
1 14
1 15
2 5
2 14
2 15
3 5
3 11
3 13
3 14
4 7
4 9
4 14
4 15
5 7
5 9
5 10
5 13
6 11
6 12
6 13
7 11
7 14
7 15
8 12
8 13
9 11
9 12
9 14
10 13
10 14
11 13
11 15
12 13
12 14
12 15

result:

ok correct

Test #29:

score: 0
Accepted
time: 8ms
memory: 10632kb

input:

29

output:

15 27
1 3
1 5
1 10
2 6
2 10
2 12
2 13
2 15
3 5
3 9
3 10
3 14
4 7
4 10
4 13
4 15
5 10
6 8
6 11
7 13
8 13
8 15
9 10
11 12
11 14
12 13
13 15

result:

ok correct

Test #30:

score: 0
Accepted
time: 8ms
memory: 10596kb

input:

30

output:

15 31
1 2
1 11
1 12
1 13
2 5
2 6
2 9
2 13
3 5
3 10
3 11
3 12
3 14
4 11
4 14
5 7
5 9
5 11
5 12
6 7
6 8
6 9
8 14
9 12
9 13
10 13
10 15
11 14
12 13
13 14
14 15

result:

ok correct

Test #31:

score: 0
Accepted
time: 14ms
memory: 10604kb

input:

31

output:

10 15
1 2
1 5
1 8
1 10
2 3
2 10
3 7
4 6
4 8
4 9
5 10
6 8
6 9
7 9
7 10

result:

ok correct

Test #32:

score: 0
Accepted
time: 8ms
memory: 10644kb

input:

32

output:

10 21
1 2
1 4
1 6
1 7
1 8
1 9
1 10
2 3
2 5
2 6
2 8
3 6
4 10
5 7
5 10
6 7
6 8
6 10
7 8
8 9
8 10

result:

ok correct

Test #33:

score: 0
Accepted
time: 9ms
memory: 10716kb

input:

33

output:

10 17
1 2
1 7
1 8
2 6
2 8
3 5
3 7
3 8
4 6
4 7
4 9
5 9
6 7
6 8
6 10
7 10
8 10

result:

ok correct

Test #34:

score: 0
Accepted
time: 8ms
memory: 10660kb

input:

34

output:

15 31
1 6
1 8
1 10
1 14
1 15
2 9
2 13
3 5
3 7
3 8
3 12
3 15
4 6
4 8
4 15
5 6
5 9
6 7
7 8
7 10
7 11
7 13
7 14
9 10
9 11
9 12
9 14
9 15
10 11
13 14
13 15

result:

ok correct

Test #35:

score: 0
Accepted
time: 7ms
memory: 10732kb

input:

35

output:

16 37
1 2
1 3
1 11
1 13
1 15
1 16
2 4
2 8
3 8
3 12
3 13
4 9
4 14
4 16
5 8
5 10
5 11
5 12
5 14
5 15
6 8
6 12
6 14
6 15
7 12
7 14
8 14
9 13
9 14
10 12
10 13
11 13
11 14
12 13
13 15
13 16
14 16

result:

ok correct

Test #36:

score: 0
Accepted
time: 9ms
memory: 10732kb

input:

36

output:

10 19
1 3
1 4
1 6
1 8
1 9
1 10
2 4
2 6
2 8
2 9
3 5
3 7
4 5
5 7
5 8
5 10
6 10
7 8
8 9

result:

ok correct

Test #37:

score: 0
Accepted
time: 13ms
memory: 10628kb

input:

37

output:

10 19
1 7
1 9
1 10
2 3
2 9
2 10
3 5
3 9
4 5
4 6
4 7
4 9
4 10
5 8
5 9
6 7
6 10
7 10
8 9

result:

ok correct

Test #38:

score: 0
Accepted
time: 10ms
memory: 10576kb

input:

38

output:

10 19
1 2
1 5
1 6
1 7
2 4
2 5
2 6
2 8
2 10
3 5
3 10
4 5
4 8
4 9
5 6
5 7
6 7
6 9
8 9

result:

ok correct

Test #39:

score: 0
Accepted
time: 14ms
memory: 10600kb

input:

39

output:

10 22
1 2
1 4
1 5
1 6
1 7
1 10
2 4
2 10
3 5
3 6
3 10
4 5
4 6
4 8
4 9
5 6
6 8
6 10
7 8
8 9
8 10
9 10

result:

ok correct

Test #40:

score: 0
Accepted
time: 9ms
memory: 10720kb

input:

40

output:

10 18
1 2
1 3
1 5
1 7
1 8
2 3
2 4
2 8
2 9
3 5
3 6
3 9
3 10
4 5
4 7
5 10
6 8
6 10

result:

ok correct

Test #41:

score: 0
Accepted
time: 10ms
memory: 10760kb

input:

41

output:

10 20
1 2
1 8
2 4
2 7
2 9
3 4
3 6
3 8
3 9
4 5
4 7
4 8
4 10
5 7
6 7
6 9
6 10
7 8
7 10
8 9

result:

ok correct

Test #42:

score: 0
Accepted
time: 14ms
memory: 10600kb

input:

42

output:

10 19
1 4
1 6
1 9
1 10
2 5
2 6
2 7
2 9
3 6
3 9
3 10
4 5
4 9
4 10
5 6
6 9
7 8
8 10
9 10

result:

ok correct

Test #43:

score: 0
Accepted
time: 14ms
memory: 10724kb

input:

43

output:

10 19
1 3
1 8
2 5
2 6
2 7
2 8
2 9
3 4
3 7
4 5
4 9
5 6
5 9
6 7
6 8
6 10
7 8
7 10
8 9

result:

ok correct

Test #44:

score: 0
Accepted
time: 9ms
memory: 10540kb

input:

44

output:

10 26
1 2
1 3
1 4
1 5
1 6
1 7
1 8
2 3
2 5
2 8
2 10
3 6
4 5
4 6
4 8
4 10
5 7
5 9
5 10
6 7
6 8
6 9
6 10
7 8
7 10
8 10

result:

ok correct

Test #45:

score: 0
Accepted
time: 14ms
memory: 10720kb

input:

45

output:

10 25
1 2
1 3
1 6
1 7
1 8
1 9
1 10
2 3
2 4
2 5
2 9
2 10
3 4
4 5
4 6
4 9
5 6
5 7
5 8
6 9
6 10
7 8
7 9
7 10
9 10

result:

ok correct

Test #46:

score: 0
Accepted
time: 14ms
memory: 10596kb

input:

46

output:

11 25
1 4
1 6
1 8
1 9
1 11
2 4
2 8
2 9
2 10
2 11
3 4
3 8
3 11
4 6
4 10
5 10
5 11
6 7
6 8
6 11
7 10
8 9
8 10
9 11
10 11

result:

ok correct

Test #47:

score: 0
Accepted
time: 9ms
memory: 10720kb

input:

47

output:

13 21
1 5
1 12
2 5
2 6
2 8
2 10
2 13
3 8
3 9
4 7
4 8
4 13
5 6
5 12
6 9
7 8
8 9
8 10
10 11
10 13
11 12

result:

ok correct

Test #48:

score: 0
Accepted
time: 14ms
memory: 10716kb

input:

48

output:

11 23
1 2
1 3
1 5
1 6
1 7
1 8
1 9
1 10
1 11
2 3
2 5
2 8
3 6
3 11
4 8
4 11
5 7
5 11
6 7
6 9
6 10
9 10
10 11

result:

ok correct

Test #49:

score: 0
Accepted
time: 8ms
memory: 10716kb

input:

49

output:

14 31
1 2
1 3
1 4
1 6
1 8
1 10
1 13
2 10
3 7
3 9
3 10
3 13
3 14
4 6
5 6
5 9
5 10
6 8
6 13
7 10
8 9
8 11
8 14
9 10
9 14
10 12
10 14
11 14
12 13
12 14
13 14

result:

ok correct

Test #50:

score: 0
Accepted
time: 13ms
memory: 10728kb

input:

50

output:

12 30
1 6
1 7
1 11
2 6
2 9
2 11
3 6
3 8
3 11
4 6
4 7
4 8
4 9
5 6
5 7
5 9
5 10
5 11
6 8
6 10
6 11
7 8
7 9
7 10
7 11
8 10
8 11
8 12
10 11
10 12

result:

ok correct

Test #51:

score: 0
Accepted
time: 10ms
memory: 10544kb

input:

51

output:

11 25
1 5
1 6
1 8
2 4
2 6
2 8
2 9
2 10
2 11
3 6
3 8
3 10
3 11
4 5
4 6
4 8
4 9
4 10
5 6
5 7
5 8
6 10
7 8
8 10
9 10

result:

ok correct

Test #52:

score: 0
Accepted
time: 3ms
memory: 10624kb

input:

52

output:

11 27
1 6
1 7
2 6
2 7
2 8
2 9
2 11
3 4
3 6
3 7
3 9
3 10
4 6
4 7
4 9
4 10
5 6
5 7
5 11
6 7
6 11
7 8
7 10
8 9
8 10
8 11
9 11

result:

ok correct

Test #53:

score: 0
Accepted
time: 7ms
memory: 10720kb

input:

53

output:

11 26
1 2
1 4
1 5
1 7
1 9
1 11
2 3
2 5
2 7
2 10
2 11
3 4
3 5
3 6
3 10
4 5
4 8
4 11
5 8
5 10
5 11
6 10
7 8
7 9
7 11
10 11

result:

ok correct

Test #54:

score: 0
Accepted
time: 6ms
memory: 10632kb

input:

54

output:

11 31
1 2
1 4
1 5
1 9
1 10
1 11
2 3
2 6
2 7
2 8
2 9
2 10
2 11
3 5
3 6
3 8
3 9
3 10
4 6
4 8
4 9
5 6
5 8
5 9
5 11
6 8
6 10
7 10
8 10
9 11
10 11

result:

ok correct

Test #55:

score: 0
Accepted
time: 3ms
memory: 10596kb

input:

55

output:

11 33
1 2
1 3
1 4
1 5
1 7
1 9
1 10
1 11
2 4
2 8
2 10
3 5
3 7
3 9
3 10
3 11
4 5
4 6
4 8
4 10
5 7
5 9
5 10
6 7
6 9
6 10
6 11
8 9
8 10
8 11
9 10
9 11
10 11

result:

ok correct

Test #56:

score: 0
Accepted
time: 14ms
memory: 10596kb

input:

56

output:

12 29
1 2
1 7
1 9
1 10
1 11
2 3
2 4
2 6
2 7
2 10
2 12
3 10
4 5
4 7
4 11
5 6
5 8
5 10
5 11
6 8
6 10
6 11
6 12
7 11
8 12
9 10
10 11
10 12
11 12

result:

ok correct

Test #57:

score: 0
Accepted
time: 13ms
memory: 10720kb

input:

57

output:

15 32
1 5
1 13
1 14
2 6
2 13
2 14
3 9
3 11
3 13
3 15
4 9
4 11
4 13
5 8
5 9
5 13
5 15
6 7
6 15
7 11
8 12
9 11
9 13
9 15
10 11
10 14
11 14
11 15
12 15
13 14
13 15
14 15

result:

ok correct

Test #58:

score: 0
Accepted
time: 13ms
memory: 10544kb

input:

58

output:

13 25
1 6
1 11
2 6
2 9
3 6
3 7
3 9
3 12
4 5
4 7
4 8
4 13
5 6
5 10
6 8
6 9
7 8
7 12
7 13
8 9
8 10
8 11
8 13
10 11
11 13

result:

ok correct

Test #59:

score: 0
Accepted
time: 14ms
memory: 10664kb

input:

59

output:

15 28
1 3
1 4
1 8
1 10
2 3
2 7
2 8
2 14
2 15
3 4
3 6
4 5
4 6
4 8
4 9
4 14
4 15
5 8
6 10
7 11
7 13
8 11
9 15
10 11
10 14
10 15
12 13
12 14

result:

ok correct

Test #60:

score: 0
Accepted
time: 11ms
memory: 10624kb

input:

60

output:

12 30
1 3
1 5
1 6
1 7
1 8
1 12
2 3
2 9
2 10
2 11
3 4
3 5
3 6
3 7
3 10
3 12
4 6
4 7
5 6
5 7
6 7
6 10
6 12
7 9
7 10
7 11
8 10
8 11
9 11
10 11

result:

ok correct