answer.code: In function ‘void solve()’:
answer.code:15:9: error: expected ‘,’ or ‘;’ before ‘flag’
   15 |         flag &= b + c - 1 <= n; //Only one common element in IS and DS of perm
      |         ^~~~
answer.code:20:17: error: ‘ll’ was not declared in this scope
   20 |         vector <ll> dd[b + 1];
      |                 ^~
answer.code:20:19: error: template argument 1 is invalid
   20 |         vector <ll> dd[b + 1];
      |                   ^
answer.code:20:19: error: template argument 2 is invalid
answer.code:22:23: error: request for member ‘push_back’ in ‘dd[1]’, which is of non-class type ‘int’
   22 |                 dd[1].push_back(1);
      |                       ^~~~~~~~~
answer.code:25:23: error: request for member ‘push_back’ in ‘dd[i]’, which is of non-class type ‘int’
   25 |                 dd[i].push_back(c * i);
      |                       ^~~~~~~~~
answer.code:27:11: error: expected ‘;’ before ‘u’
   27 |         ll u = n - (b + c - 1); //fill remaining
      |           ^~
      |           ;
answer.code:29:24: error: ‘u’ was not declared in this scope
   29 |                 while (u > 0 && dd[i].back() - 1 > dd[i - 1][0]) {
      |                        ^
answer.code:29:39: error: request for member ‘back’ in ‘dd[i]’, which is of non-class type ‘int’
   29 |                 while (u > 0 && dd[i].back() - 1 > dd[i - 1][0]) {
      |                                       ^~~~
answer.code:29:61: error: invalid types ‘int[int]’ for array subscript
   29 |                 while (u > 0 && dd[i].back() - 1 > dd[i - 1][0]) {
      |                                                             ^
answer.code:30:31: error: request for member ‘push_back’ in ‘dd[i]’, which is of non-class type ‘int’
   30 |                         dd[i].push_back(dd[i].back() - 1);
      |                               ^~~~~~~~~
answer.code:30:47: error: request for member ‘back’ in ‘dd[i]’, which is of non-class type ‘int’
   30 |                         dd[i].push_back(dd[i].back() - 1);
      |                                               ^~~~
answer.code:35:31: error: request for member ‘begin’ in ‘dd[i]’, which is of non-class type ‘int’
   35 |                 reverse(dd[i].begin(), dd[i].end());
      |                               ^~~~~
answer.code:35:46: error: request for member ‘end’ in ‘dd[i]’, which is of non-class type ‘int’
   35 |                 reverse(dd[i].begin(), dd[i].end());
      |                                              ^~~
answer.code:36:31: error: request for member ‘empty’ in ‘dd[i]’, which is of non-class type ‘int’
   36 |                 while (!dd[i].empty()) {
      |                               ^~~~~
answer.code:37:43: error: request for member ‘back’ in ‘dd[i]’, which is of non-class type ‘int’
   37 |                         z.push_back(dd[i].back());
      |                                           ^~~~
answer.code:38:31: error: request for member ‘pop_back’ in ‘dd[i]’, which is of non-class type ‘int’
   38 |                         dd[i].pop_back();
      |                               ^~~~~~~~