/in/foo.cc: In function 'void SetInter(int*, int*, int, int)':
/in/foo.cc:17:22: warning: left operand of comma operator has no effect [-Wunused-value]
  for(int i=0,flag=0;i<k,flag<k;i++,flag++)
                     ~^~
/in/foo.cc:18:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(pa[flag]=pa[i]) a[i-1]=a[i],k--;
                    ^