/in/foo.c: In function 'main':
/in/foo.c:11:11: warning: format '%d' expects argument of type 'int *', but argument 2 has type 'int' [-Wformat=]
   scanf("%d %d",a[n],b[n]);
           ^
/in/foo.c:11:14: warning: format '%d' expects argument of type 'int *', but argument 3 has type 'int' [-Wformat=]
   scanf("%d %d",a[n],b[n]);
              ^
/in/foo.c:16:4: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
    if(a[i]=a[j]){
    ^~