answer.code:19:9: error: ‘ll’ does not name a type
   19 |         ll insert(dataa x)
      |         ^~
answer.code:32:4: error: expected initializer before ‘lastans’
   32 | ll lastans = 0;
      |    ^~~~~~~
answer.code: In function ‘int main()’:
answer.code:40:11: error: expected primary-expression before ‘)’ token
   40 |     while()
      |           ^
answer.code:42:9: error: ‘ll’ was not declared in this scope
   42 |         ll x,y;
      |         ^~
answer.code:43:16: error: ‘x’ was not declared in this scope
   43 |         cin >> x >> y;
      |                ^
answer.code:43:21: error: ‘y’ was not declared in this scope; did you mean ‘yn’?
   43 |         cin >> x >> y;
      |                     ^
      |                     yn
answer.code:45:14: error: ‘lastans’ was not declared in this scope; did you mean ‘atanl’?
   45 |         x ^= lastans;
      |              ^~~~~~~
      |              atanl
answer.code:49:20: error: ‘w’ was not declared in this scope
   49 |         lastans += w.insert(a);
      |                    ^