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Problem 4543. -- [POI2014]Hotel加强版

4543: [POI2014]Hotel加强版

Time Limit: 10 Sec  Memory Limit: 128 MB
Submit: 1656  Solved: 782
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Description

同OJ3522
数据范围:n<=100000

Input

Output

Sample Input

7
1 2
5 7
2 5
2 3
5 6
4 5

Sample Output

5

HINT

Source

By Claris

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