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OI-codes/BZOJ/4033/data/9.in

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20 17
2 1 1516
3 1 6355
4 1 3299
5 1 2161
6 5 7675
7 6 9185
8 4 8929
9 3 7777
10 9 7230
11 10 6689
12 10 3953
13 9 3147
14 2 6149
15 1 7743
16 3 7691
17 7 6215
18 5 4038
19 17 2273
20 10 6161