View Compilation Error

0_0_25133761_16800.cpp: In function 'void query(int, int, int, int, int)':
0_0_25133761_16800.cpp:41:22: error: return-statement with a value, in function returning 'void' [-fpermissive]
         return MAX[rt];
                      ^
0_0_25133761_16800.cpp:45:45: error: invalid use of void expression
     if(L <= m) ans = max(ans,query(L,R,lson));
                                             ^
0_0_25133761_16800.cpp:46:45: error: invalid use of void expression
     if(m <  R) ans = max(ans,query(L,R,rson));
                                             ^
0_0_25133761_16800.cpp: In function 'int main()':
0_0_25133761_16800.cpp:59:45: error: invalid use of void expression
         else printf("%ld\n",query(a,b,1,n,1));
                                             ^