333 . 買一送一

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User's AC Ratio

100.0% (8/8)

Submission's AC Ratio

29.7% (11/37)

Tags

ytp ytp-senior ytp-2022

Description

題目 PDF 檔在這裡

Input Format

Output Format

Sample Input 1

2

Sample Output 1

1
1 2

Sample Input 2

3

Sample Output 2

-1

Sample Input 3

4

Sample Output 3

4
1 2
2 3
2 4
3 4

Hints

Problem Source

YTP 2022 高中組程式挑戰營 p13

Subtasks

No. Testdata Range Constraints Score
1 0~2 範例測資 0
2 0~9 $N \leq 10$ 3
3 0~26 無額外限制 17

Testdata and Limits

No. Time Limit (ms) Memory Limit (VSS, KiB) Output Limit (KiB) Subtasks
0 1000 524288 65536 1 2 3
1 1000 524288 65536 1 2 3
2 1000 524288 65536 1 2 3
3 1000 524288 65536 2 3
4 1000 524288 65536 2 3
5 1000 524288 65536 2 3
6 1000 524288 65536 2 3
7 1000 524288 65536 2 3
8 1000 524288 65536 2 3
9 1000 524288 65536 2 3
10 1000 524288 65536 3
11 1000 524288 65536 3
12 1000 524288 65536 3
13 1000 524288 65536 3
14 1000 524288 65536 3
15 1000 524288 65536 3
16 1000 524288 65536 3
17 1000 524288 65536 3
18 1000 524288 65536 3
19 1000 524288 65536 3
20 1000 524288 65536 3
21 1000 524288 65536 3
22 1000 524288 65536 3
23 1000 524288 65536 3
24 1000 524288 65536 3
25 1000 524288 65536 3
26 1000 524288 65536 3
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