View Compilation Error

0_0_36480804_31230.cpp:3:1: error: 'll' does not name a type
 ll n,a[maxn],tr[maxn];
 ^
0_0_36480804_31230.cpp:5:1: error: 'll' does not name a type
 ll lowbit(ll x){
 ^
0_0_36480804_31230.cpp:9:13: error: variable or field 'update' declared void
 void update(ll pos,ll val){
             ^
0_0_36480804_31230.cpp:9:13: error: 'll' was not declared in this scope
0_0_36480804_31230.cpp:9:20: error: 'll' was not declared in this scope
 void update(ll pos,ll val){
                    ^