View Compilation Error

0_0_36709692_26850.cpp: In function 'void solve()':
0_0_36709692_26850.cpp:91:10: error: 'rt' was not declared in this scope
   insert(rt[i-1], rt[i], 1, n, sa[i]);
          ^
0_0_36709692_26850.cpp:120:28: error: 'rt' was not declared in this scope
    }else printf("%d\n",ask(rt[l-1], rt[r], 1, n, k));
                            ^