View Compilation Error

0_0_35540907_27475.cpp: In function 'int main()':
0_0_35540907_27475.cpp:9:10: error: 'j' was not declared in this scope
   while(!j.empty()) x.pop();
          ^
0_0_35540907_27475.cpp:10:16: error: 's' was not declared in this scope
         while(!s.empty()) t.pop();
                ^