/in/foo.cc: In member function 'void Splay::rotate(int)':
/in/foo.cc:49:20: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
         if(ch[f][d]=ch[o][d^1])fa[ch[f][d]]=f;
            ~~~~~~~~^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:129:17: warning: suggest explicit braces to avoid ambiguous 'else' [-Wdangling-else]
         }else if(c=='F')if(s[tree.rt]>=x)wt(tree.kth(x)+delta);
                 ^