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普通spfa就可以了

Posted by dsqwwe at 2011-02-26 15:24:23 on Problem 1062 
虚拟一个节点，每个物品都与虚拟出的节点连一条权为物品价值的边，
然后相关联的物品连一条权为优惠价格的边，求节点1与虚拟节点的最短路就okLe
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