Amazon算法面试体验与csoahelp的专业支持-面试辅助 –VO 辅助 – 一亩三分地 – VO support – 代面试

题目 1(英文原文)

I own a parking garage that provides valet parking service.
When a customer pulls up to the entrance they are either rejected because the garage is full, or they are given a ticket they can use to collect their car, and the car is parked for them.
Given a set of different parking bays (Small, Medium, Large), write a control program to accept/reject cars (also small, medium, or large) as they arrive, and issue/redeem tickets.

Garage layout is 1 small bay, 1 medium bay, and 2 large bays: [1,1,2]

First sequence Actions:
[(arrival, small), (arrival, large), (arrival, medium), (arrival, large), (arrival, medium)]
Expected output: [1, 2, 3, 4, reject]

Second sequence Actions:
[(arrival, small), (arrival, large), (arrival, medium), (arrival, large), (depart, 3), (arrival, medium)]
Expected output: [1, 2, 3, 4, 5]


面试挑战分析

这道题要求实现一个停车场管理系统,既能实时判断车位分配,也能正确处理车辆的进出操作。对于候选人来说,挑战在于:

  1. 准确管理车位状态:需要根据大小区分车位(Small、Medium、Large)和车辆。
  2. 处理动态变化的请求:既包括arrival(车辆到达),也包括depart(车辆离开),并且需要保证车位状态及时更新。
  3. 输出结果与需求一致:如分配车票、正确处理reject

csoahelp 提供的支持

在候选人与csoahelp合作的过程中,我们从以下几个方面进行了辅导:

  1. 问题拆解与Clarification
    候选人首先需要明确以下问题:
    • 如何正确处理arrivaldepart类型的请求?
    • 车辆与车位是否严格匹配(例如small车只能停在small车位)?
    • 系统如何记录并返回操作结果(如reject或车票编号)?
    csoahelp帮助候选人将需求转化为清晰的实现目标,并梳理问题逻辑。
  2. 设计高效的解决方案
    我们指导候选人采用如下方法:
    • 使用字典(hashmap)存储车票与车位的映射,方便快速查找车辆信息。
    • 使用数组管理不同类型车位的可用数量,减少操作复杂度。
    • 根据每种操作类型(arrivaldepart),分别设计对应的处理逻辑。
  3. 提供详细代码框架与注释

        
def assign_parking(garage_layout, sequence):
    size_to_idx = {"small": 0, "medium": 1, "large": 2}
    result = []
    ticket = 1
    ticket_to_size = dict()
    for req in sequence:
        req_type, car_type = req
        if req_type == "arrival":
            size_idx = size_to_idx[car_type]
            if garage_layout[size_idx] > 0:
                garage_layout[size_idx] -= 1
                result.append(ticket)
                ticket_to_size[ticket] = car_type
                ticket += 1
            else:
                result.append("reject")
        elif req_type == "depart":
            ticket_number = car_type
            garage_layout[size_to_idx[ticket_to_size[ticket_number]]] += 1
    return result
        
    

示例讲解

csoahelp指导候选人通过以下实例验证代码逻辑:

  • 第一组操作:
    [(arrival, small), (arrival, large), (arrival, medium), (arrival, large), (arrival, medium)]
    初始车位:[1, 1, 2]
    处理过程:
  1. 到达small车:分配票1,车位状态更新为[0, 1, 2]
  2. 到达large车:分配票2,车位状态更新为[0, 1, 1]
  3. 到达medium车:分配票3,车位状态更新为[0, 0, 1]
  4. 到达large车:分配票4,车位状态更新为[0, 0, 0]
  5. 到达medium车:无可用车位,返回reject

结果输出: [1, 2, 3, 4, reject]

  • 第二组操作:
    [(arrival, small), (arrival, large), (arrival, medium), (arrival, large), (depart, 3), (arrival, medium)]
    初始车位:[1, 1, 2]
    处理过程:
  1. 前四步同上,车位状态为[0, 0, 0]
  2. 离开票3的车辆,释放medium车位,状态更新为[0, 1, 0]
  3. 到达medium车:分配票5,车位状态更新为[0, 0, 0]

结果输出: [1, 2, 3, 4, 5]


候选人反馈

在csoahelp的辅导下,候选人顺利完成了这道题。我们提供的详细问题分解与代码注释,使候选人能够快速理解并实现逻辑,避免了潜在的陷阱。


为什么选择csoahelp?

csoahelp提供的不仅仅是答案,而是完整的思维流程与实现框架。从clarification到实现,我们帮助候选人全面准备高压环境下的顶级公司面试。如果你也在准备技术面试,请与我们联系!

如果您也想在面试中脱颖而出,欢迎联系我们。CSOAHelp 提供全面的面试辅导与代面服务,帮助您成功拿到梦寐以求的 Offer!

If you need more interview support or interview proxy practice, feel free to contact us. We offer comprehensive interview support services to help you successfully land a job at your dream company.

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