假设场景是一个人进入荒岛，只能带20单位重量的东西。可选物品有两种属性，分别是重量和重要性。二维列表如下（第一位是物品名称，第二位是重要性，第三位是重量）：
[["knife","10","1"],["Beans","20","5"],["Potatoes","15","10"],["Onions","2","1"],["Sleeping Bag","30","7"],["Rope","10","5"],["Compass","30","1"]]
每种物品最多带一个，但是所带物品总数无限制。最终要求得出最佳物品携带方案。
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