/in/foo.cc:5:14: error: stray '\357' in program
     int num=0；
              ^
/in/foo.cc:5:15: error: stray '\274' in program
     int num=0；
               ^
/in/foo.cc:5:16: error: stray '\233' in program
     int num=0；
                ^
/in/foo.cc: In function 'int SetUnion(int*, int, int*, int, int*)':
/in/foo.cc:6:5: error: expected ',' or ';' before 'for'
     for (int i=0;i<n1;i++)
     ^~~
/in/foo.cc:6:18: error: 'i' was not declared in this scope
     for (int i=0;i<n1;i++)
                  ^