You are given a 0-indexed integer array nums representing the initial positions of some marbles. You are also given two 0-indexed integer arrays moveFrom and moveTo of equal length.
Throughout moveFrom.length steps, you will change the positions of the marbles. On the ith step, you will move all marbles at position moveFrom[i] to position moveTo[i].
After completing all the steps, return the sorted list of occupied positions.
\n\nNotes:
\n\n\n
Example 1:
\n\n\nInput: nums = [1,6,7,8], moveFrom = [1,7,2], moveTo = [2,9,5]\nOutput: [5,6,8,9]\nExplanation: Initially, the marbles are at positions 1,6,7,8.\nAt the i = 0th step, we move the marbles at position 1 to position 2. Then, positions 2,6,7,8 are occupied.\nAt the i = 1st step, we move the marbles at position 7 to position 9. Then, positions 2,6,8,9 are occupied.\nAt the i = 2nd step, we move the marbles at position 2 to position 5. Then, positions 5,6,8,9 are occupied.\nAt the end, the final positions containing at least one marbles are [5,6,8,9].\n\n
Example 2:
\n\n\nInput: nums = [1,1,3,3], moveFrom = [1,3], moveTo = [2,2]\nOutput: [2]\nExplanation: Initially, the marbles are at positions [1,1,3,3].\nAt the i = 0th step, we move all the marbles at position 1 to position 2. Then, the marbles are at positions [2,2,3,3].\nAt the i = 1st step, we move all the marbles at position 3 to position 2. Then, the marbles are at positions [2,2,2,2].\nSince 2 is the only occupied position, we return [2].\n\n\n
\n
Constraints:
\n\n1 <= nums.length <= 1051 <= moveFrom.length <= 105moveFrom.length == moveTo.length1 <= nums[i], moveFrom[i], moveTo[i] <= 109moveFrom[i] at the moment we want to apply the ith move.给你一个下标从 0 开始的整数数组 nums ，表示一些石块的初始位置。再给你两个长度 相等 下标从 0 开始的整数数组 moveFrom 和 moveTo 。
在 moveFrom.length 次操作内，你可以改变石块的位置。在第 i 次操作中，你将位置在 moveFrom[i] 的所有石块移到位置 moveTo[i] 。
完成这些操作后，请你按升序返回所有 有 石块的位置。
\n\n注意：
\n\n\n\n
示例 1：
\n\n\n输入：nums = [1,6,7,8], moveFrom = [1,7,2], moveTo = [2,9,5]\n输出：[5,6,8,9]\n解释：一开始，石块在位置 1,6,7,8 。\n第 i = 0 步操作中，我们将位置 1 处的石块移到位置 2 处，位置 2,6,7,8 有石块。\n第 i = 1 步操作中，我们将位置 7 处的石块移到位置 9 处，位置 2,6,8,9 有石块。\n第 i = 2 步操作中，我们将位置 2 处的石块移到位置 5 处，位置 5,6,8,9 有石块。\n最后，至少有一个石块的位置为 [5,6,8,9] 。\n\n
示例 2：
\n\n\n输入：nums = [1,1,3,3], moveFrom = [1,3], moveTo = [2,2]\n输出：[2]\n解释：一开始，石块在位置 [1,1,3,3] 。\n第 i = 0 步操作中，我们将位置 1 处的石块移到位置 2 处，有石块的位置为 [2,2,3,3] 。\n第 i = 1 步操作中，我们将位置 3 处的石块移到位置 2 处，有石块的位置为 [2,2,2,2] 。\n由于 2 是唯一有石块的位置，我们返回 [2] 。\n\n\n
\n\n
提示：
\n\n1 <= nums.length <= 1051 <= moveFrom.length <= 105moveFrom.length == moveTo.length1 <= nums[i], moveFrom[i], moveTo[i] <= 109i 步操作时，moveFrom[i] 处至少有一个石块。\\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\"],\"java\":[\"Java\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u88ab\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5305\\u542b Pair \\u7c7b: https:\\/\\/docs.oracle.com\\/javase\\/8\\/javafx\\/api\\/javafx\\/util\\/Pair.html <\\/p>\"],\"python\":[\"Python\",\" \\u7248\\u672c\\uff1a \\u4e3a\\u4e86\\u65b9\\u4fbf\\u8d77\\u89c1\\uff0c\\u5927\\u90e8\\u5206\\u5e38\\u7528\\u5e93\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8 \\u5bfc\\u5165\\uff0c\\u5982\\uff1aarray<\\/a>, bisect<\\/a>, 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