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网络安全黑客技术练习题大全(33)

  • 2026-11-02 18:34:11
网络安全黑客技术练习题大全(33)

题目21:买卖股票的最佳时机 II

问题描述:给你一个整数数组 prices,其中 prices[i] 表示某支股票第 i 天的价格。在每一天,你可以决定是否购买和/或出售股票。你在任何时候最多只能持有一股股票。你也可以先购买,然后在同一天出售。返回你能获得的最大利润。

解题思路:贪心。由于可以无限次交易,只要后一天价格高于前一天,就在前一天买入、后一天卖出,累积所有正收益。遍历数组,若 prices[i] > prices[i-1],则将差值加入利润。

Python代码示例:

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def maxProfit(prices):    profit = 0    for i in range(1, len(prices)):        if prices[i] > prices[i - 1]:            profit += prices[i] - prices[i - 1]    return profit


题目22:目标和

问题描述:给你一个整数数组 nums 和一个整数 target。向数组中的每个整数前添加 '+' 或 '-',然后串联起所有整数,可以构造一个表达式。返回可以通过上述方法构造的、运算结果等于 target 的不同表达式的数目。

解题思路:转化为 0-1 背包问题。设所有元素之和为 sum,添加正号的元素之和为 P,添加负号的元素之和为 N,则 P + N = sum,P - N = target。解得 P = (sum + target) / 2。若 sum + target 为奇数或 target 绝对值大于 sum,则无解。问题转化为从 nums 中选出若干元素使其和为 P 的方案数。设 dp[j] 为凑成和 j 的方案数,状态转移:dp[j] += dp[j - num],从后往前遍历。

Python代码示例:

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def findTargetSumWays(nums, target):    total = sum(nums)    if abs(target) > total or (total + target) % 2 != 0:        return 0    P = (total + target) // 2    dp = [0] * (P + 1)    dp[0] = 1    for num in nums:        for j in range(P, num - 1, -1):            dp[j] += dp[j - num]    return dp[P]


题目23:最长公共子序列

问题描述:给定两个字符串 text1 和 text2,返回这两个字符串的最长公共子序列的长度。如果不存在公共子序列,返回 0。子序列是指从原字符串中删除若干字符(也可以不删除)而不改变剩余字符相对顺序形成的新字符串。

解题思路:动态规划。设 dp[i][j] 为 text1 前 i 个字符与 text2 前 j 个字符的最长公共子序列长度。状态转移:

  • • 若 text1[i-1] == text2[j-1],则 dp[i][j] = dp[i-1][j-1] + 1;
  • • 否则 dp[i][j] = max(dp[i-1][j], dp[i][j-1])。最终返回 dp[m][n]。可用滚动数组优化空间。

Python代码示例:

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def longestCommonSubsequence(text1, text2):    m, n = len(text1), len(text2)    dp = [[0] * (n + 1) for _ in range(m + 1)]    for i in range(1, m + 1):        for j in range(1, n + 1):            if text1[i - 1] == text2[j - 1]:                dp[i][j] = dp[i - 1][j - 1] + 1            else:                dp[i][j] = max(dp[i - 1][j], dp[i][j - 1])    return dp[m][n]


题目24:被围绕的区域

问题描述:给你一个 m x n 的矩阵 board,由若干字符 'X' 和 'O' 组成。找到所有被 'X' 围绕的区域,并将这些区域里所有的 'O' 用 'X' 填充。被围绕的区域不会存在于边界上,换句话说,任何边界上的 'O' 都不会被填充为 'X'。任何不在边界上,或不与边界上的 'O' 相连的 'O' 最终都会被填充为 'X'。

解题思路:从边界上的 'O' 开始 DFS/BFS,将所有与边界相连的 'O' 标记为特殊字符(如 '#')。然后遍历整个棋盘,将剩余的 'O' 变为 'X',将 '#' 恢复为 'O'。

Python代码示例:

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def solve(board):    if not board:        return    m, n = len(board), len(board[0])    def dfs(i, j):        if i < 0 or i >= m or j < 0 or j >= n or board[i][j] != 'O':            return        board[i][j] = '#'        dfs(i + 1, j)        dfs(i - 1, j)        dfs(i, j + 1)        dfs(i, j - 1)    for i in range(m):        dfs(i, 0)        dfs(i, n - 1)    for j in range(n):        dfs(0, j)        dfs(m - 1, j)    for i in range(m):        for j in range(n):            if board[i][j] == 'O':                board[i][j] = 'X'            elif board[i][j] == '#':                board[i][j] = 'O'


题目25:除法求值

问题描述:给你一个变量对数组 equations 和一个实数值数组 values 作为已知条件,其中 equations[i] = [Ai, Bi] 和 values[i] 共同表示等式 Ai / Bi = values[i]。每个 Ai 或 Bi 是一个表示单个变量的字符串。另有一些以数组 queries 表示的问题,其中 queries[j] = [Cj, Dj] 表示第 j 个问题,请你根据已知条件找出 Cj / Dj = ? 的结果。如果存在某个无法确定的答案,则用 -1.0 替代这个答案。输入总是有效的,你可以假设变量不会出现矛盾的结果。

解题思路:构建加权有向图。将每个变量视为节点,等式 Ai / Bi = values[i] 表示从 Ai 到 Bi 有一条权重为 values[i] 的边,同时从 Bi 到 Ai 有一条权重为 1/values[i] 的边。对于每个查询,使用 DFS 或 BFS 从 Cj 出发寻找 Dj,路径上边权的乘积即为答案。若无法到达则返回 -1.0。

Python代码示例:

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from collections import defaultdictdef calcEquation(equations, values, queries):    graph = defaultdict(dict)    for (a, b), val in zip(equations, values):        graph[a][b] = val        graph[b][a] = 1 / val    def dfs(start, end, visited):        if start not in graph or end not in graph:            return -1.0        if start == end:            return 1.0        visited.add(start)        for neighbor, weight in graph[start].items():            if neighbor in visited:                continue            result = dfs(neighbor, end, visited)            if result != -1.0:                return weight * result        return -1.0    return [dfs(c, d, set()) for c, d in queries]

题目26:最长连续递增序列

问题描述:给定一个未经排序的整数数组 nums,找到最长且连续递增的子序列,并返回该序列的长度。连续递增的子序列可以由两个下标 l 和 r(l < r)确定,如果对于每个 l <= i < r,都有 nums[i] < nums[i + 1],那么子序列 nums[l...r] 就是连续递增子序列。

解题思路:一次遍历。维护当前连续递增的长度 cur 和最大长度 max_len。若 nums[i] > nums[i-1],则 cur += 1;否则 cur = 1。每次更新 max_len。

Python代码示例:

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def findLengthOfLCIS(nums):    if not nums:        return 0    max_len = cur = 1    for i in range(1, len(nums)):        if nums[i] > nums[i - 1]:            cur += 1            max_len = max(max_len, cur)        else:            cur = 1    return max_len


题目27:验证回文串

问题描述:给定一个字符串 s,验证它是否是回文串。只考虑字母和数字字符,可以忽略字母的大小写。空字符串定义为有效的回文串。

解题思路:双指针。左指针从左往右,右指针从右往左,跳过非字母数字字符,并统一转为小写后比较。若所有对应字符都相同,则为回文串。

Python代码示例:

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def isPalindrome(s):    left, right = 0, len(s) - 1    while left < right:        while left < right and not s[left].isalnum():            left += 1        while left < right and not s[right].isalnum():            right -= 1        if s[left].lower() != s[right].lower():            return False        left += 1        right -= 1    return True


题目28:反转字符串

问题描述:编写一个函数,其作用是将输入的字符串反转过来。输入字符串以字符数组 s 的形式给出。要求原地修改输入数组,使用 O(1) 的额外空间。

解题思路:双指针。左指针指向数组开头,右指针指向数组末尾,交换两指针指向的字符,然后左指针右移、右指针左移,直到两指针相遇。

Python代码示例:

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def reverseString(s):    left, right = 0, len(s) - 1    while left < right:        s[left], s[right] = s[right], s[left]        left += 1        right -= 1


题目29:两个数组的交集

问题描述:给定两个数组 nums1 和 nums2,返回它们的交集。输出结果中的每个元素一定是唯一的。我们可以不考虑输出结果的顺序。

解题思路:将 nums1 转为集合 set1,然后遍历 nums2,若元素在 set1 中则加入结果集合 result。最后将结果集合转为列表返回。

Python代码示例:

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def intersection(nums1, nums2):    set1 = set(nums1)    result = set()    for num in nums2:        if num in set1:            result.add(num)    return list(result)


题目30:找不同

问题描述:给定两个字符串 s 和 t,它们只包含小写字母。字符串 t 由字符串 s 随机重排,然后在随机位置添加一个字母。请找出在 t 中被添加的字母。

解题思路:利用异或运算的性质:a ^ a = 0,a ^ 0 = a。将 s 和 t 中所有字符的 ASCII 码依次异或,最终结果即为多出的那个字符。也可用字符计数法。

Python代码示例:

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def findTheDifference(s, t):    result = 0    for ch in s:        result ^= ord(ch)    for ch in t:        result ^= ord(ch)    return chr(result)

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  1. 请求信息 : 2026-11-02 21:26:35 HTTP/1.1 GET : http://www.sjds.net/a/532619.html
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  1. CONNECT:[ UseTime:0.000693s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000942s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000466s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000335s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000674s ]
  6. SELECT * FROM `set` [ RunTime:0.000342s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000609s ]
  8. SELECT * FROM `article` WHERE `id` = 532619 LIMIT 1 [ RunTime:0.000483s ]
  9. UPDATE `article` SET `lasttime` = 1793625995 WHERE `id` = 532619 [ RunTime:0.001796s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000350s ]
  11. SELECT * FROM `article` WHERE `id` < 532619 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000425s ]
  12. SELECT * FROM `article` WHERE `id` > 532619 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000584s ]
  13. SELECT * FROM `article` WHERE `id` < 532619 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000691s ]
  14. SELECT * FROM `article` WHERE `id` < 532619 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000705s ]
  15. SELECT * FROM `article` WHERE `id` < 532619 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000777s ]
0.090723s