Knapsack = 20.00
items = [
(1, "1", 2.44, 3.98), (1, "1", 2
items = [
(1, "1", 2.44, 3.98), (1, "1", 2
阅读背景：
Python用贪心算法解背包问题，运算结果很奇怪
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