View Compilation Error

0_0_33686999_4299.cpp: In function 'int add(int, int)':
0_0_33686999_4299.cpp:40:10: error: 'rt' was not declared in this scope
  else if(rt[x<<1|1].val>=wi){
          ^
0_0_33686999_4299.cpp:40:13: error: 'x' was not declared in this scope
  else if(rt[x<<1|1].val>=wi){
             ^