2126 . Defense your country

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User's AC Ratio

NaN% (0/0)

Submission's AC Ratio

NaN% (0/0)

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Description

The PDF version of this problem can be downloaded here.

Input Format

Output Format

Sample Input 1

2
5 6
0 1
1 2
2 0
2 3
3 4
4 2
10 6
0 1
0 2
0 3
1 2
1 3
2 3

Sample Output 1

3
4

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Problem Source

Migrated from old NTUJ.

Subtasks

No. Testdata Range Score

Testdata and Limits

No. Time Limit (ms) Memory Limit (VSS, KiB) Output Limit (KiB) Subtasks
0 10000 65536 200
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