题意：中文题

思路：先把男生排列，由于是圆桌，所以每个位置都是一样的，排列方案为A(n,n)/n，再对女生排列，由于男生已经在座位上了，所以此时每个座位是不一样的，方案数为A(n,n)

AC代码：

#include "iostream"#include "string.h"#include "stack"#include "queue"#include "string"#include "vector"#include "set"#include "map"#include "algorithm"#include "stdio.h"#include "math.h"#define ll long long#define bug(x) cout<
     
      <<" "<<"UUUUU"<
      
       >n;    for(int i=2; i