{ "data": { "question": { "questionId": "1840", "questionFrontendId": "1722", "categoryTitle": "Algorithms", "boundTopicId": 551154, "title": "Minimize Hamming Distance After Swap Operations", "titleSlug": "minimize-hamming-distance-after-swap-operations", "content": "
You are given two integer arrays, source and target, both of length n. You are also given an array allowedSwaps where each allowedSwaps[i] = [ai, bi] indicates that you are allowed to swap the elements at index ai and index bi (0-indexed) of array source. Note that you can swap elements at a specific pair of indices multiple times and in any order.
The Hamming distance of two arrays of the same length, source and target, is the number of positions where the elements are different. Formally, it is the number of indices i for 0 <= i <= n-1 where source[i] != target[i] (0-indexed).
Return the minimum Hamming distance of source and target after performing any amount of swap operations on array source.
\n
Example 1:
\n\n\nInput: source = [1,2,3,4], target = [2,1,4,5], allowedSwaps = [[0,1],[2,3]]\nOutput: 1\nExplanation: source can be transformed the following way:\n- Swap indices 0 and 1: source = [2,1,3,4]\n- Swap indices 2 and 3: source = [2,1,4,3]\nThe Hamming distance of source and target is 1 as they differ in 1 position: index 3.\n\n\n
Example 2:
\n\n\nInput: source = [1,2,3,4], target = [1,3,2,4], allowedSwaps = []\nOutput: 2\nExplanation: There are no allowed swaps.\nThe Hamming distance of source and target is 2 as they differ in 2 positions: index 1 and index 2.\n\n\n
Example 3:
\n\n\nInput: source = [5,1,2,4,3], target = [1,5,4,2,3], allowedSwaps = [[0,4],[4,2],[1,3],[1,4]]\nOutput: 0\n\n\n
\n
Constraints:
\n\nn == source.length == target.length1 <= n <= 1051 <= source[i], target[i] <= 1050 <= allowedSwaps.length <= 105allowedSwaps[i].length == 20 <= ai, bi <= n - 1ai != bi给你两个整数数组 source 和 target ,长度都是 n 。还有一个数组 allowedSwaps ,其中每个 allowedSwaps[i] = [ai, bi] 表示你可以交换数组 source 中下标为 ai 和 bi(下标从 0 开始)的两个元素。注意,你可以按 任意 顺序 多次 交换一对特定下标指向的元素。
相同长度的两个数组 source 和 target 间的 汉明距离 是元素不同的下标数量。形式上,其值等于满足 source[i] != target[i] (下标从 0 开始)的下标 i(0 <= i <= n-1)的数量。
在对数组 source 执行 任意 数量的交换操作后,返回 source 和 target 间的 最小汉明距离 。
\n\n
示例 1:
\n\n输入:source = [1,2,3,4], target = [2,1,4,5], allowedSwaps = [[0,1],[2,3]]\n输出:1\n解释:source 可以按下述方式转换:\n- 交换下标 0 和 1 指向的元素:source = [2,1,3,4]\n- 交换下标 2 和 3 指向的元素:source = [2,1,4,3]\nsource 和 target 间的汉明距离是 1 ,二者有 1 处元素不同,在下标 3 。\n\n\n
示例 2:
\n\n输入:source = [1,2,3,4], target = [1,3,2,4], allowedSwaps = []\n输出:2\n解释:不能对 source 执行交换操作。\nsource 和 target 间的汉明距离是 2 ,二者有 2 处元素不同,在下标 1 和下标 2 。\n\n
示例 3:
\n\n输入:source = [5,1,2,4,3], target = [1,5,4,2,3], allowedSwaps = [[0,4],[4,2],[1,3],[1,4]]\n输出:0\n\n\n
\n\n
提示:
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