该博客讨论了一种名为'Dominos'的问题，其中目标是确定为了使所有多米诺骨牌倒下所需的最少手动推倒次数。问题的关键在于理解连接是单向的，这使得传统的并查集方法不适用。博主分享了解决此问题的思路，即考虑没有父节点的多米诺骨牌，并在某些情况下比较并查集的集合数和这些牌的数量，输出较大值。博客包含示例输入和输出，以及解决问题的代码。
【题目】
Problem D: Dominos
Dominos are lots of fun. Children like to stand the tiles on their side in long lines. When one domino falls, it knocks down the next one, which knocks down the one after that, all the way down the line. However, sometimes a domino fails to knock the next one down. In that case, we have to knock it down by hand to get the dominos falling again.
Your task is to determine, given the layout of some domino tiles, the minimum number of dominos that must be knocked down by hand in order for all of the dominos to fall.
Input
The first line of input contains one integer specifying the number of test cases to follow. Each test case begins with a line containing two integers, each no larger than 100 000. The first integer n is the number of domino tiles and the second integer m is the number of lines to follow in the test case. The domino tiles are numbered from 1 to n. Each
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