You found two items in a treasure chest! The first item weighs weight1 and is worth value1, and the second item weighs weight2 and is worth value2. What is the total maximum value of the items you can take with you, assuming that your max weight capacity is maxW and you can't come back for the items later?

Note that there are only two items and you can't bring more than one item of each type, i.e. you can't take two first items or two second items.

Example

• For value1 = 10, weight1 = 5, value2 = 6, weight2 = 4, and maxW = 8, the output should be
  knapsackLight(value1, weight1, value2, weight2, maxW) = 10.

  You can only carry the first item.

• For value1 = 10, weight1 = 5, value2 = 6, weight2 = 4, and maxW = 9, the output should be
  knapsackLight(value1, weight1, value2, weight2, maxW) = 16.

  You're strong enough to take both of the items with you.

• For value1 = 5, weight1 = 3, value2 = 7, weight2 = 4, and maxW = 6, the output should be
  knapsackLight(value1, weight1, value2, weight2, maxW) = 7.

  You can't take both items, but you can take any of them.

我的解答：

def knapsackLight(value1, weight1, value2, weight2, maxW):

    dic = {weight1:value1, weight2:value2}

    if min(weight1, weight2) > maxW:

        return 0

    elif max(weight1, weight2) > maxW:

        return dic[min(weight1, weight2)]

    elif weight1 + weight2 > maxW:

        return max(value1, value2)

    else:

        return value1 + value2

def knapsackLight(v1, w1, v2, w2, W):

    return max(int(w1 <= W) * v1, int(w2 <= W) * v2, int(w1 + w2 <= W) * (v1 + v2))

# 这都是些什么脑子...