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网络安全黑客技术练习题大全(41)

  • 2026-11-11 01:00:13
网络安全黑客技术练习题大全(41)

题目1:最长和谐子序列

问题描述:和谐数组是指一个数组里元素的最大值和最小值之间的差别正好是 1。现在,给你一个整数数组 nums,请你在所有可能的子序列中找到最长的和谐子序列的长度。子序列可以通过删除一些元素或不删除元素得到,而不需要改变剩下元素的顺序。

解题思路:使用哈希表统计每个数字出现的次数。然后遍历哈希表中的每个键 x,若 x + 1 也存在,则 count[x] + count[x+1] 可以构成和谐子序列,更新最大值。

Python代码示例:

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from collections import Counterdef findLHS(nums):    count = Counter(nums)    max_len = 0    for x in count:        if x + 1 in count:            max_len = max(max_len, count[x] + count[x + 1])    return max_len


题目2:最短补全词

问题描述:给你一个字符串 licensePlate 和一个字符串数组 words,请你找出 words 中的最短补全词。补全词需要满足:包含 licensePlate 中的所有字母(忽略大小写和数字、空格),且字母出现次数不少于 licensePlate 中对应字母的次数。如果有多个满足条件的补全词,返回 words 中最先出现的那个。

解题思路:先统计 licensePlate 中每个字母(忽略大小写,忽略非字母)的出现次数。然后遍历 words,对每个单词统计字母出现次数,检查是否覆盖 licensePlate 的需求。维护长度最短且最先出现的满足条件的单词。

Python代码示例:

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from collections import Counterdef shortestCompletingWord(licensePlate, words):    need = Counter(ch.lower() for ch in licensePlate if ch.isalpha())    result = None    for word in words:        wc = Counter(word.lower())        if all(wc[ch] >= need[ch] for ch in need):            if result is None or len(word) < len(result):                result = word    return result


题目3:按奇偶排序数组 II

问题描述:给定一个非负整数数组 nums,nums 中一半整数是奇数,一半整数是偶数。对数组进行排序,以便当 nums[i] 为奇数时,i 也是奇数;当 nums[i] 为偶数时,i 也是偶数。返回任何满足上述条件的数组作为答案。

解题思路:双指针。一个指针 even 从 0 开始每次走两步,寻找需要放置偶数的位置;另一个指针 odd 从 1 开始每次走两步,寻找需要放置奇数的位置。遍历时若 nums[even] 为奇数且 nums[odd] 为偶数,则交换两者。

Python代码示例:

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def sortArrayByParityII(nums):    even, odd = 0, 1    n = len(nums)    while even < n and odd < n:        while even < n and nums[even] % 2 == 0:            even += 2        while odd < n and nums[odd] % 2 == 1:            odd += 2        if even < n and odd < n:            nums[even], nums[odd] = nums[odd], nums[even]            even += 2            odd += 2    return nums


题目4:复写零

问题描述:给你一个长度固定的整数数组 arr,请你将该数组中出现的每个零都复写一遍,并将其余的元素向右平移。注意:请不要在超过该数组长度的位置写入元素。请对输入的数组就地修改,不要从函数返回任何东西。

解题思路:先统计数组中零的个数,计算出复写后需要保留的原数组元素范围。然后从后往前遍历,将元素写入正确位置;遇到零时写入两次并跳过。

Python代码示例:

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def duplicateZeros(arr):    n = len(arr)    zeros = arr.count(0)    i = n - 1    j = n + zeros - 1    while i >= 0:        if j < n:            arr[j] = arr[i]        j -= 1        if arr[i] == 0:            if j < n:                arr[j] = 0            j -= 1        i -= 1


题目5:将每个元素替换为右侧最大元素

问题描述:给你一个数组 arr,请你将所有元素替换为它右侧的最大元素。如果某个元素右侧没有元素,则将其替换为 -1。返回替换后的数组。

解题思路:从右往左遍历,维护当前右侧的最大值 max_right(初始为 -1)。对于每个位置 i,先保存 arr[i],然后将 arr[i] 更新为 max_right,再用保存的值更新 max_right = max(max_right, old_val)。

Python代码示例:

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def replaceElements(arr):    max_right = -1    for i in range(len(arr) - 1, -1, -1):        old = arr[i]        arr[i] = max_right        max_right = max(max_right, old)    return arr

题目6:回文数

问题描述:给你一个整数 x,如果 x 是一个回文整数,返回 true;否则,返回 false。回文数是指正序(从左向右)和倒序(从右向左)读都是一样的整数。例如,121 是回文,而 123 不是。

解题思路:负数一定不是回文数。将整数反转一半:当原数字大于反转后的数字时,不断取原数字的末位拼接到反转数字上。循环结束时,若数字位数为偶数,则原数字等于反转数字;若为奇数,则原数字等于反转数字除以 10。也可以直接转为字符串比较,但题目通常要求不转字符串。

Python代码示例:

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def isPalindrome(x):    if x < 0 or (x % 10 == 0 and x != 0):        return False    reversed_half = 0    while x > reversed_half:        reversed_half = reversed_half * 10 + x % 10        x //= 10    return x == reversed_half or x == reversed_half // 10


题目7:位1的个数

问题描述:编写一个函数,输入是一个无符号整数(以二进制串的形式),返回其二进制表达式中数字位数为 '1' 的个数(也被称为汉明重量)。

解题思路:利用位运算技巧 n & (n - 1),该操作会将 n 的二进制表示中最右边的 1 变为 0。不断执行该操作并计数,直到 n 变为 0。循环次数等于二进制中 1 的个数。

Python代码示例:

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def hammingWeight(n):    count = 0    while n:        n &= n - 1        count += 1    return count


题目8:Excel表列名称

问题描述:给你一个整数 columnNumber,返回它在 Excel 表中相对应的列名称。例如:

  • • 1 -> "A"
  • • 2 -> "B"
  • • 3 -> "C"
  • • ...
  • • 26 -> "Z"
  • • 27 -> "AA"
  • • 28 -> "AB"
  • • ...

解题思路:这是 1-based 的 26 进制转换。每次将 columnNumber 减 1,然后对 26 取余得到当前位字母,再整除 26。重复直到 columnNumber 为 0,最后将结果反转。

Python代码示例:

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def convertToTitle(columnNumber):    result = []    while columnNumber > 0:        columnNumber -= 1        result.append(chr(ord('A') + columnNumber % 26))        columnNumber //= 26    return ''.join(reversed(result))


题目9:求众数 II

问题描述:给定一个大小为 n 的整数数组,找出其中所有出现超过 ⌊ n/3 ⌋ 次的元素。要求时间复杂度为 O(n),空间复杂度为 O(1)。

解题思路:使用摩尔投票法的扩展版本。由于出现次数超过 n/3 的元素最多有两个,维护两个候选元素 cand1、cand2 及其计数 count1、count2。遍历数组进行投票:若当前数等于候选之一则对应计数加一;若某计数为 0 则更换候选;否则两个计数都减一。投票结束后,再遍历一次数组验证两个候选的实际出现次数是否超过 n/3,将满足条件的加入结果。

Python代码示例:

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def majorityElement(nums):    cand1 = cand2 = None    count1 = count2 = 0    for num in nums:        if num == cand1:            count1 += 1        elif num == cand2:            count2 += 1        elif count1 == 0:            cand1 = num            count1 = 1        elif count2 == 0:            cand2 = num            count2 = 1        else:            count1 -= 1            count2 -= 1    result = []    n = len(nums)    for cand in (cand1, cand2):        if cand is not None and nums.count(cand) > n // 3:            result.append(cand)    return result


题目10:二叉树的后序遍历

问题描述:给你一棵二叉树的根节点 root,返回它节点值的后序遍历。后序遍历顺序为:左子树 → 右子树 → 根节点。

解题思路:递归:按左、右、根的顺序访问。迭代:可以使用栈模拟。一种巧妙的方法是按照“根 → 右 → 左”的顺序遍历,然后将结果反转,即得到后序遍历。具体地,用栈存储节点,每次弹出节点并加入结果,然后先将左子节点压栈,再将右子节点压栈(保证右子树先处理),最后反转结果。

Python代码示例(假设 TreeNode 类已定义):

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def postorderTraversal(root):    if not root:        return []    stack = [root]    result = []    while stack:        node = stack.pop()        result.append(node.val)        if node.left:            stack.append(node.left)        if node.right:            stack.append(node.right)    return result[::-1]

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  1. CONNECT:[ UseTime:0.000853s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001045s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000445s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000359s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000719s ]
  6. SELECT * FROM `set` [ RunTime:0.000379s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000776s ]
  8. SELECT * FROM `article` WHERE `id` = 544095 LIMIT 1 [ RunTime:0.000517s ]
  9. UPDATE `article` SET `lasttime` = 1794331319 WHERE `id` = 544095 [ RunTime:0.002290s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000345s ]
  11. SELECT * FROM `article` WHERE `id` < 544095 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000536s ]
  12. SELECT * FROM `article` WHERE `id` > 544095 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000416s ]
  13. SELECT * FROM `article` WHERE `id` < 544095 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000696s ]
  14. SELECT * FROM `article` WHERE `id` < 544095 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000862s ]
  15. SELECT * FROM `article` WHERE `id` < 544095 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000764s ]
0.109231s