View Compilation Error

0_0_38341052_18934.c: In function 'quary':
0_0_38341052_18934.c:6:8: error: 'Tree' undeclared (first use in this function)
   res+=Tree[pos];
        ^
0_0_38341052_18934.c:6:8: note: each undeclared identifier is reported only once for each function it appears in