{ "data": { "question": { "questionId": "2700", "questionFrontendId": "2564", "categoryTitle": "Algorithms", "boundTopicId": 2103744, "title": "Substring XOR Queries", "titleSlug": "substring-xor-queries", "content": "

You are given a binary string s, and a 2D integer array queries where queries[i] = [firsti, secondi].

\n\n

For the ith query, find the shortest substring of s whose decimal value, val, yields secondi when bitwise XORed with firsti. In other words, val ^ firsti == secondi.

\n\n

The answer to the ith query is the endpoints (0-indexed) of the substring [lefti, righti] or [-1, -1] if no such substring exists. If there are multiple answers, choose the one with the minimum lefti.

\n\n

Return an array ans where ans[i] = [lefti, righti] is the answer to the ith query.

\n\n

A substring is a contiguous non-empty sequence of characters within a string.

\n\n

 

\n

Example 1:

\n\n
\nInput: s = "101101", queries = [[0,5],[1,2]]\nOutput: [[0,2],[2,3]]\nExplanation: For the first query the substring in range [0,2] is "101" which has a decimal value of 5, and 5 ^ 0 = 5, hence the answer to the first query is [0,2]. In the second query, the substring in range [2,3] is "11", and has a decimal value of 3, and 3 ^ 1 = 2. So, [2,3] is returned for the second query. \n\n
\n\n

Example 2:

\n\n
\nInput: s = "0101", queries = [[12,8]]\nOutput: [[-1,-1]]\nExplanation: In this example there is no substring that answers the query, hence [-1,-1] is returned.\n
\n\n

Example 3:

\n\n
\nInput: s = "1", queries = [[4,5]]\nOutput: [[0,0]]\nExplanation: For this example, the substring in range [0,0] has a decimal value of 1, and 1 ^ 4 = 5. So, the answer is [0,0].\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "子字符串异或查询", "translatedContent": "

给你一个 二进制字符串 s 和一个整数数组 queries ,其中 queries[i] = [firsti, secondi] 。

\n\n

对于第 i 个查询,找到 s 的 最短子字符串 ,它对应的 十进制值 val 与 firsti 按位异或 得到 secondi ,换言之,val ^ firsti == secondi 。

\n\n

第 i 个查询的答案是子字符串 [lefti, righti] 的两个端点(下标从 0 开始),如果不存在这样的子字符串,则答案为 [-1, -1] 。如果有多个答案,请你选择 lefti 最小的一个。

\n\n

请你返回一个数组 ans ,其中 ans[i] = [lefti, righti] 是第 i 个查询的答案。

\n\n

子字符串 是一个字符串中一段连续非空的字符序列。

\n\n

 

\n\n

示例 1:

\n\n
\n输入:s = \"101101\", queries = [[0,5],[1,2]]\n输出:[[0,2],[2,3]]\n解释:第一个查询,端点为 [0,2] 的子字符串为 \"101\" ,对应十进制数字 5 ,且 5 ^ 0 = 5 ,所以第一个查询的答案为 [0,2]。第二个查询中,端点为 [2,3] 的子字符串为 \"11\" ,对应十进制数字 3 ,且 3 ^ 1 = 2 。所以第二个查询的答案为 [2,3] 。\n
\n\n

示例 2:

\n\n
\n输入:s = \"0101\", queries = [[12,8]]\n输出:[[-1,-1]]\n解释:这个例子中,没有符合查询的答案,所以返回 [-1,-1] 。\n
\n\n

示例 3:

\n\n
\n输入:s = \"1\", queries = [[4,5]]\n输出:[[0,0]]\n解释:这个例子中,端点为 [0,0] 的子字符串对应的十进制值为 1 ,且 1 ^ 4 = 5 。所以答案为 [0,0] 。\n
\n\n

 

\n\n

提示:

\n\n\n\n

 

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