> For the complete documentation index, see [llms.txt](https://851958789.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://851958789.gitbook.io/notes/0041_first_missing_positive/slt.md).

# 思路1 把数组中的正数按数值重新放在数组中

比如，当前遍历到的元素是5，则把它放在nums\[4]这个位置。最后再遍历数组，找到第一个没有被正确放置的位置的索引idx，返回idx+1。


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