#include <iostream>
using namespace std;
int main()
{
    char a,b,c;
    for ( a='x';a<='z';a++)
    {
        for ( b='x';b<='z';b++)
        {
           for ( c='x';c<='z';c++)
           {
               if (a==b||b==c||a==c||a=='x'||c=='x'||c=='z')
               {
                   continue;
               }
               else
               {
                   cout<<"a对阵"<<a<<" "<<"b对阵"<<b<<" "<<"c对阵"<<c<<endl; 
               }
           }
        }
     } 
 } 

有任何看法请评论。