View Compilation Error

0_0_24434822_13494.cpp: In function 'int main()':
0_0_24434822_13494.cpp:33:56: error: 'std::_Rb_tree_const_iterator<node>::_Self' has no member named 'y'
             if(it == s.begin() || (it==s.end()&&(it--).y>=y || it->x==x || ((--it)->y>=y))
                                                        ^
0_0_24434822_13494.cpp:34:13: error: expected ')' before '{' token
             {
             ^
0_0_24434822_13494.cpp:41:9: error: expected primary-expression before '}' token
         }
         ^