View Compilation Error

0_0_37733067_767.cpp: In function 'tree query(int, int, int)':
0_0_37733067_767.cpp:80:13: error: expected initializer before '.' token
     tree res.init(0, 0);
             ^
0_0_37733067_767.cpp:81:12: error: 'res' was not declared in this scope
     pushup(res, query(ls(k), x, y), query(rs(k), x, y));
            ^