谁能告诉我这题代码？

https://code.xueersi.com/live/creator/1?template_project_id=58547924&work_type=xes_classwork&needShare=false&stuId=79642425&liveId=3000466&planId=3000466&catalogId=1246972&codeBook=true&courseId=508458&codeSync=1&is_locked=1&cversion=cpp&order=6&ide_sort=cpp