View Compilation Error

0_0_30401973_24791.cpp: In function 'int suan(int, int, int, int, int)':
0_0_30401973_24791.cpp:62:10: error: 'struct Node' has no member named 'query'
     r+=A.query(A.rk[l],A.rk[r+1]);
          ^
0_0_30401973_24791.cpp:63:10: error: 'struct Node' has no member named 'query'
     l-=B.query(B.rk[len+1-r],B.rk[len-l+2]);
          ^
0_0_30401973_24791.cpp: In function 'int main()':
0_0_30401973_24791.cpp:85:24: error: 'n' was not declared in this scope
         for(int i=1;i<=n/2;i++){
                        ^
0_0_30401973_24791.cpp:95:26: error: 'n' was not declared in this scope
         if(k==1) ans=1ll*n*(n+1)/2;
                          ^