/in/foo.cc: In function 'void add(int, ll)':
/in/foo.cc:37:16: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
     if(x=top[x])up[f[x]]+=p*(size[f[x]]-size[x]),x=f[x];
                ^
/in/foo.cc: Assembler messages:
/in/foo.cc:43: Error: unsupported instruction `mov'