python - 不确定哪些测试用例未通过我的代码

Question

我在CodeWars里找到了下面的代码，也写了说明。它说我的代码通过了 8 个测试用例，而不是第 9 个。有人可以告诉我哪里出了问题或我应该如何进行吗？我只能访问我回答的四个测试用例。 https://www.codewars.com/kata/555615a77ebc7c2c8a0000b8/discuss#label-issue

'''
The new "Avengers" movie has just been released! There are a lot of people at the cinema
box office standing in a huge line. Each of them has a single 100, 50 or 25 dollars bill.
A "Avengers" ticket costs 25 dollars. Vasya is currently working as a clerk. He wants to
sell a ticket to every single person in this line. Can Vasya sell a ticket to each person
and give the change if he initially has no money and sells the tickets strictly in the
order people follow in the line? Return YES, if Vasya can sell a ticket to each person
and give the change. Otherwise return NO.
Examples:
### Python ###
tickets([25, 25, 50]) # => YES
tickets([25, 100])
         # => NO. Vasya will not have enough money to give change to 100 dollars
'''

def tickets(people):
    sum = 0
    for p in people:
        if p < 25:
            return 'NO'
        if p == 25:
            sum += p
        elif p > 25:
            if (sum - p) <0 :
                return 'NO'
            else:
                sum += p
    return 'YES'

print(tickets([25, 25, 50])) #YES
print(tickets([25, 100])) #NO
print(tickets([25, 25, 50, 50, 50])) #YES
print(tickets([25, 25, 25, 25, 50, 100, 50])) #YES

Answer 1

if 语句也是错误的。想想 sum += p 错误的测试用例 [25, 50, 100] 和 if 语句错误的以下场景 [25, 50]。使用下面的代码，这两个问题都应该得到解决。

def tickets(people):
    register = {'25s': 0, '50s': 0, '100s': 0}
    cash_in_register = 0
    for p in people:
        if p < 25:
            return 'NO'
        elif p == 25:
            cash_in_register += p
            register['25s'] += 1
        else:
            if (p - cash_in_register) <= 25: # do you have enough money for change?
                if p == 50 and register['25s'] >= 1:
                    register['50s'] += 1
                    register['25s'] -= 1
                    cash_in_register += 25
                elif (p == 100 and register['50s'] >= 1 and register['25s'] >= 1):
                    register['100s'] += 1
                    register['50s'] -= 1
                    register['25s'] -= 1
                    cash_in_register += 25
                elif (p == 100 and register['25s'] >= 3):
                    register['100s'] += 1
                    register['25s'] -= 3
                    cash_in_register += 25
                else:
                    return 'NO'
            else:
                return 'NO'
    return 'YES'

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