/in/foo.cc: In function 'void SetInter(int*, int*)':
/in/foo.cc:12:26: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
          if(a2[i2]=a1[i1])
                          ^
/in/foo.cc:8:17: warning: 'n2' is used uninitialized in this function [-Wuninitialized]
  for(int i2=0;i2<n2;i2++)
               ~~^~~
/in/foo.cc:10:18: warning: 'n1' may be used uninitialized in this function [-Wmaybe-uninitialized]
   for(int i1=0;i1<n1;i1++)
                ~~^~~