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#2
crazyrabbit2006-05-03 20:05
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1 2 1 2
2 2 1 3
3 2 1 5
4 2 2 2
1 3 2 3
2 3 => 2 5
3 3 3 2
3 4 3 3
4 4 3 4
1 5 4 2
2 5 4 4
怎么实现?