/in/foo.c: In function 'main':
/in/foo.c:7:12: warning: unused variable 'flag' [-Wunused-variable]
  int n, i, flag, count=0, xi[10000]={0}, yi[10000]={0};
            ^~~~
/in/foo.c: In function 'IsRepeat':
/in/foo.c:28:6: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(m=-1)
      ^