Python-100-Days/Day16-20/code/example04.py

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2019-01-25 02:52:40 +08:00
"""
贪婪法在对问题求解时总是做出在当前看来是最好的选择
不追求最优解快速找到满意解
"""
class Thing(object):
"""物品"""
def __init__(self, name, price, weight):
self.name = name
self.price = price
self.weight = weight
@property
def value(self):
"""价格重量比"""
return self.price / self.weight
def input_thing():
"""输入物品信息"""
name_str, price_str, weight_str = input().split()
return name_str, int(price_str), int(weight_str)
def main():
"""主函数"""
max_weight, num_of_things = map(int, input().split())
all_things = []
for _ in range(num_of_things):
all_things.append(Thing(*input_thing()))
all_things.sort(key=lambda x: x.value, reverse=True)
total_weight = 0
total_price = 0
for thing in all_things:
if total_weight + thing.weight <= max_weight:
print(f'小偷拿走了{thing.name}')
total_weight += thing.weight
total_price += thing.price
print(f'总价值: {total_price}美元')
if __name__ == '__main__':
main()