{ "data": { "question": { "questionId": "3840", "questionFrontendId": "3525", "categoryTitle": "Algorithms", "boundTopicId": 3655806, "title": "Find X Value of Array II", "titleSlug": "find-x-value-of-array-ii", "content": "
You are given an array of positive integers nums
and a positive integer k
. You are also given a 2D array queries
, where queries[i] = [indexi, valuei, starti, xi]
.
You are allowed to perform an operation once on nums
, where you can remove any suffix from nums
such that nums
remains non-empty.
The x-value of nums
for a given x
is defined as the number of ways to perform this operation so that the product of the remaining elements leaves a remainder of x
modulo k
.
For each query in queries
you need to determine the x-value of nums
for xi
after performing the following actions:
nums[indexi]
to valuei
. Only this step persists for the rest of the queries.nums[0..(starti - 1)]
(where nums[0..(-1)]
will be used to represent the empty prefix).Return an array result
of size queries.length
where result[i]
is the answer for the ith
query.
A prefix of an array is a subarray that starts from the beginning of the array and extends to any point within it.
\n\nA suffix of an array is a subarray that starts at any point within the array and extends to the end of the array.
\n\nNote that the prefix and suffix to be chosen for the operation can be empty.
\n\nNote that x-value has a different definition in this version.
\n\n\n
Example 1:
\n\nInput: nums = [1,2,3,4,5], k = 3, queries = [[2,2,0,2],[3,3,3,0],[0,1,0,1]]
\n\nOutput: [2,2,2]
\n\nExplanation:
\n\nnums
becomes [1, 2, 2, 4, 5]
, and the empty prefix must be removed. The possible operations are:\n\n\t[2, 4, 5]
. nums
becomes [1, 2]
.nums
becomes [1, 2, 2, 4, 5]
with a product 80, which gives remainder 2 when divided by 3.nums
becomes [1, 2, 2, 3, 5]
, and the prefix [1, 2, 2]
must be removed. The possible operations are:\n\tnums
becomes [3, 5]
.[5]
. nums
becomes [3]
.nums
becomes [1, 2, 2, 3, 5]
, and the empty prefix must be removed. The possible operations are:\n\t[2, 2, 3, 5]
. nums
becomes [1]
.[3, 5]
. nums
becomes [1, 2, 2]
.Example 2:
\n\nInput: nums = [1,2,4,8,16,32], k = 4, queries = [[0,2,0,2],[0,2,0,1]]
\n\nOutput: [1,0]
\n\nExplanation:
\n\nnums
becomes [2, 2, 4, 8, 16, 32]
. The only possible operation is:\n\n\t[2, 4, 8, 16, 32]
.nums
becomes [2, 2, 4, 8, 16, 32]
. There is no possible way to perform the operation.Example 3:
\n\nInput: nums = [1,1,2,1,1], k = 2, queries = [[2,1,0,1]]
\n\nOutput: [5]
\n\n
Constraints:
\n\n1 <= nums[i] <= 109
1 <= nums.length <= 105
1 <= k <= 5
1 <= queries.length <= 2 * 104
queries[i] == [indexi, valuei, starti, xi]
0 <= indexi <= nums.length - 1
1 <= valuei <= 109
0 <= starti <= nums.length - 1
0 <= xi <= k - 1
给你一个由 正整数 组成的数组 nums
和一个 正整数 k
。同时给你一个二维数组 queries
,其中 queries[i] = [indexi, valuei, starti, xi]
。
你可以对 nums
执行 一次 操作,移除 nums
的任意 后缀 ,使得 nums
仍然非空。
给定一个 x
,nums
的 x值 定义为执行以上操作后剩余元素的 乘积 除以 k
的 余数 为 x
的方案数。
对于 queries
中的每个查询,你需要执行以下操作,然后确定 xi
对应的 nums
的 x值:
nums[indexi]
更新为 valuei
。仅这个更改在接下来的所有查询中保留。nums[0..(starti - 1)]
(nums[0..(-1)]
表示 空前缀 )。返回一个长度为 queries.length
的数组 result
,其中 result[i]
是第 i
个查询的答案。
数组的一个 前缀 是从数组开始位置到任意位置的子数组。
\n\n数组的一个 后缀 是从数组中任意位置开始直到结束的子数组。
\n\n子数组 是数组中一段连续的元素序列。
\n\n注意:操作中所选的前缀或后缀可以是 空的 。
\n\n注意:x值在本题中与问题 I 有不同的定义。
\n\n\n\n
示例 1:
\n\n输入: nums = [1,2,3,4,5], k = 3, queries = [[2,2,0,2],[3,3,3,0],[0,1,0,1]]
\n\n输出: [2,2,2]
\n\n解释:
\n\nnums
变为 [1, 2, 2, 4, 5]
。移除空前缀后,可选操作包括:\n\n\t[2, 4, 5]
,nums
变为 [1, 2]
。nums
保持为 [1, 2, 2, 4, 5]
,乘积为 80,对 3 取余为 2。nums
变为 [1, 2, 2, 3, 5]
。移除前缀 [1, 2, 2]
后,可选操作包括:\n\tnums
为 [3, 5]
。[5]
,nums
为 [3]
。nums
保持为 [1, 2, 2, 3, 5]
。移除空前缀后。可选操作包括:\n\t[2, 2, 3, 5]
。nums
为 [1]
。[3, 5]
。nums
为 [1, 2, 2]
。示例 2:
\n\n输入: nums = [1,2,4,8,16,32], k = 4, queries = [[0,2,0,2],[0,2,0,1]]
\n\n输出: [1,0]
\n\n解释:
\n\nnums
变为 [2, 2, 4, 8, 16, 32]
。唯一可行的操作是:\n\n\t[2, 4, 8, 16, 32]
。nums
仍为 [2, 2, 4, 8, 16, 32]
。没有任何操作能使余数为 1。示例 3:
\n\n输入: nums = [1,1,2,1,1], k = 2, queries = [[2,1,0,1]]
\n\n输出: [5]
\n\n\n
提示:
\n\n1 <= nums[i] <= 109
1 <= nums.length <= 105
1 <= k <= 5
1 <= queries.length <= 2 * 104
queries[i] == [indexi, valuei, starti, xi]
0 <= indexi <= nums.length - 1
1 <= valuei <= 109
0 <= starti <= nums.length - 1
0 <= xi <= k - 1
nums
.",
"In each segment tree node, store a frequency count of prefix product remainders for every x
in the range [0, k - 1].",
"For each query, update nums[index]
to value
, then merge the segments corresponding to nums[start..n - 1]
to compute the x-value
for xi
."
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