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华为2023秋招笔试真题解析

  • 2026-10-30 19:46:50
华为2023秋招笔试真题解析

来源丨经授权转自 吴师兄学算法(ID:CXYxiaowu)

作者丨吴师兄

今天更新的是华为2023秋招算法面试题。

数字序列比大小

题目描述

A,B两个人玩一个数字比大小的游戏,在游戏前,两个人会拿到相同长度的两个数字序列,两个数字序列不相同的,且其中的数字是随机的。A,B各自从数字序列中挑选出一个数字进行大小比较,赢的人得1分,输的人扣1分,相等则各自的分数不变。用过的数字需要丢弃。求A可能赢B的最大分数。

输入描述

输入数据的第1个数字表示数字序列的长度N,后面紧跟着两个长度为N的数字序列。

输出描述

A可能赢B的最大分数

示例

输入

3
4 8 10
3 6 4

输出

3

解题思路

这道题很明显是一道贪心的题目。由于平局情况的出现,本题难点在于我们如何地选择策略。

首先需要将两个数组各自排序,方便考虑。我们设置四个指针ia_left,ia_right,ib_left,ib_right,分别指向A、B数组中尚未比较过的元素的最小值和最大值。其初始化为

ia_left = 0
ib_left = 0
ia_right = n-1
ib_right = n-1

在一个while循环中,比较A和B中尚未比较过元素的最小值,即A[ia_left]和B[ib_left]。若

  • A[ia_left] > B[ib_left]。由于选择B中的其他数字,可能会导致A[ia_left]无法获胜,故选择该组进行比较,A获胜。
    • if A[ia_left] > B[ib_left]:
          ans += 1
          ia_left += 1
          ib_left += 1
  • A[ia_left] < B[ib_left]。由于此时A中最小值小于B中的任意一个元素,我们不妨采取田忌赛马的策略,让A[ia_left]和B[ib_right]进行分组,B获胜。
if A[ia_left] < B[ib_left]:
    ans -= 1
    ia_left += 1
    ib_right -= 1
  • A[ia_left] == B[ib_left]。这是最复杂的情况,我们需要再嵌套一个while循环,以考虑A和B中尚未比较过元素的最大值,即A[ia_right]和B[ib_right]情况。若
    • 暂时无法在飞书文档外展示此内容

    • 此时固然可以令A[ia_left]和B[ib_left]、A[ai_right]和B[ib_right]两两分组,但剩余元素的比较可能会让A的失利场次增多。

    • 故仍然应该选择A[ia_left]和B[ib_right]进行分组,此时丢失的分数,可能能够在A[ia_right]的其他配对中获取回来。

    • 由于此时ia_left前进,故内层while循环可以退出。

    • 显然这种情况可以和上一种情况A[ia_right] < B[ib_right]合并在一起,即

    • 要注意有可能出现 A[ia_left] == A[ia_right] == B[ib_left] == B[ib_right]的情况,故需要多加一句特殊判断。

    • if A[ia_right] <= B[ib_right]:
          if A[ia_left] < B[ib_right]:
              ans -= 1
          ia_left += 1
          ib_right -= 1
          break
    • 暂时无法在飞书文档外展示此内容

    • 由于此时B[ib_right]大于A中的任何一个元素,A无论如何配对都必输,故仍然维持着田忌赛马的策略令A[ia_left]和B[ib_right]分组,获胜。

    • 由于此时ia_left前进,故内层while循环可以退出。

    • 暂时无法在飞书文档外展示此内容

    • 若此时令A[ia_left]和B[ib_right]分组,由于A[ia_right]无论怎么配对都是必胜,但A[ia_left]原本可以平局的配对现在却输了,故不能采取这样的策略。

    • 故让A[ia_right]和B[ib_right]分组,A[ia_right]获胜。

    • 由于A[ia_left] == B[ib_left]的情况仍然存在,故此时内层的while循环不能退出。

    • if A[ia_right] > B[ib_right]:
          ans += 1
          ia_right -= 1
          ib_right -= 1
    • A[ia_right] > B[ib_right],即以下情况
    • A[ia_right] < B[ib_right],即以下情况
    • A[ia_right] == B[ib_right],即以下情况

本题核心逻辑其实就是田忌赛马,在A[ia_left]必定无法胜利的情况下(无论是必输还是可能平局),都尽量地让A[ia_left]和B[ib_right]配对。

代码

# 作者:闭着眼睛学数理化
# 微信:278166530
# 来自专栏《玩转大厂面试真题》

n = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
# 分别对A和B数组进行排序
A.sort()
B.sort()
# 设置四个指针
ia_left = 0
ib_left = 0
ia_right = n-1
ib_right = n-1
ans = 0

# 进行循环,
# 由于每次判断,A和B中的指针必定均移动一位
# 故此处只需设置一个退出循环条件即可

while ia_left < ia_right:
    # A中最小值【大于】B中最小值的情况
    if A[ia_left] > B[ib_left]:
        ans += 1
        ia_left += 1
        ib_left += 1

    # A中最小值【小于】B中最小值的情况
    elif A[ia_left] < B[ib_left]:
        ans -= 1
        ia_left += 1
        ib_right -= 1

    # A中最小值【等于】B中最小值的情况
    else:
        # 内层while循环
        while ia_left < ia_right:
            # A中最大值【大于】B中最大值的情况
            if A[ia_right] > B[ib_right]:
                ans += 1
                ia_right -= 1
                ib_right -= 1
            # A中最大值【小于等于】B中最大值的情况
            else:
                if A[ia_right] <= B[ib_right]:
                    if A[ia_left] < B[ib_right]:
                        ans -= 1
                    ia_left += 1
                    ib_right -= 1
                    break

# 退出循环时,存在ia_left == ia_right,ib_left == ib_right
# 故需要再重新判断最后一组数组A[ia_left]和B[ib_left]
if A[ia_left] > B[ib_left]:
    ans += 1
elif A[ia_left] < B[ib_left]:
    ans -= 1

print(ans)

时空复杂度

时间复杂度:O(NlogN)。排序所需的时间复杂度。在while循环中,两个列表中的每个元素只会经过一次。

空间复杂度:O(1)。仅需四个指针,若干常数变量。

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  1. CONNECT:[ UseTime:0.000790s ] mysql:host=172.18.0.4;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001066s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000456s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000342s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000543s ]
  6. SELECT * FROM `set` [ RunTime:0.000269s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000604s ]
  8. SELECT * FROM `article` WHERE `id` = 540319 LIMIT 1 [ RunTime:0.000367s ]
  9. UPDATE `article` SET `lasttime` = 1794083387 WHERE `id` = 540319 [ RunTime:0.001571s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000303s ]
  11. SELECT * FROM `article` WHERE `id` < 540319 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 540319 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000456s ]
  13. SELECT * FROM `article` WHERE `id` < 540319 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000621s ]
  14. SELECT * FROM `article` WHERE `id` < 540319 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000970s ]
  15. SELECT * FROM `article` WHERE `id` < 540319 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000751s ]
0.099254s