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OI-codes/S2OJ/1910/data/ex_qiandao3.in

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7 5 20 2
3 4
1 3
6 4
6 4
7 4
5 2
4 3
3 2
1 1
1 5
6 3
2 5
3 4
4 2
3 3
5 1
5 1
2 3
7 5
6 4