{ "data": { "question": { "questionId": "1832", "questionFrontendId": "1713", "categoryTitle": "Algorithms", "boundTopicId": 541670, "title": "Minimum Operations to Make a Subsequence", "titleSlug": "minimum-operations-to-make-a-subsequence", "content": "

You are given an array target that consists of distinct integers and another integer array arr that can have duplicates.

\n\n

In one operation, you can insert any integer at any position in arr. For example, if arr = [1,4,1,2], you can add 3 in the middle and make it [1,4,3,1,2]. Note that you can insert the integer at the very beginning or end of the array.

\n\n

Return the minimum number of operations needed to make target a subsequence of arr.

\n\n

A subsequence of an array is a new array generated from the original array by deleting some elements (possibly none) without changing the remaining elements' relative order. For example, [2,7,4] is a subsequence of [4,2,3,7,2,1,4] (the underlined elements), while [2,4,2] is not.

\n\n

 

\n

Example 1:

\n\n
\nInput: target = [5,1,3], arr = [9,4,2,3,4]\nOutput: 2\nExplanation: You can add 5 and 1 in such a way that makes arr = [5,9,4,1,2,3,4], then target will be a subsequence of arr.\n
\n\n

Example 2:

\n\n
\nInput: target = [6,4,8,1,3,2], arr = [4,7,6,2,3,8,6,1]\nOutput: 3\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "得到子序列的最少操作次数", "translatedContent": "

给你一个数组 target ，包含若干 互不相同 的整数，以及另一个整数数组 arr ，arr 可能 包含重复元素。

\n\n

每一次操作中，你可以在 arr 的任意位置插入任一整数。比方说，如果 arr = [1,4,1,2] ，那么你可以在中间添加 3 得到 [1,4,3,1,2] 。你可以在数组最开始或最后面添加整数。

\n\n

请你返回 最少 操作次数，使得 target 成为 arr 的一个子序列。

\n\n

一个数组的 子序列 指的是删除原数组的某些元素（可能一个元素都不删除），同时不改变其余元素的相对顺序得到的数组。比方说，[2,7,4] 是 [4,2,3,7,2,1,4] 的子序列（加粗元素），但 [2,4,2] 不是子序列。

\n\n

 

\n\n

示例 1：

\n\n
输入：target = [5,1,3], arr = [9,4,2,3,4]\n输出：2\n解释：你可以添加 5 和 1 ，使得 arr 变为 [5,9,4,1,2,3,4] ，target 为 arr 的子序列。\n
\n\n

示例 2：

\n\n
输入：target = [6,4,8,1,3,2], arr = [4,7,6,2,3,8,6,1]\n输出：3\n
\n\n

 

\n\n

提示：

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