View Compilation Error

0_0_33574370_23205.cpp:23:26: error: 'n' was not declared in this scope
 void build(int L=1,int R=n,int p=1) {
                          ^
0_0_33574370_23205.cpp:33:43: error: 'n' was not declared in this scope
 int query(int l,int r,int x,int L=1,int R=n,int p=1) {
                                           ^