Main.cc: In function ‘void radixsort(ll)’:
Main.cc:33:17: warning: unused variable ‘sum’ [-Wunused-variable]
   33 |         for (ll sum = 0, j = 0; j != (1 << 8); ++j)
      |                 ^~~
Main.cc:38:14: warning: capture of variable ‘cnt’ with non-automatic storage duration
   38 |             [cnt[x[j] >> i & mask]++] = x[j];
      |              ^~~
Main.cc:18:27: note: ‘ll cnt [256]’ declared here
   18 | ll n, a[mn], q, x, b[mn], cnt[1 << 8];
      |                           ^~~
Main.cc:38:17: error: expected ‘,’ before ‘[’ token
   38 |             [cnt[x[j] >> i & mask]++] = x[j];
      |                 ^
      |                 ,
Main.cc:38:17: error: expected identifier before ‘[’ token
Main.cc: In lambda function:
Main.cc:38:39: error: expected ‘{’ before ‘=’ token
   38 |             [cnt[x[j] >> i & mask]++] = x[j];
      |                                       ^
Main.cc: In function ‘void radixsort(ll)’:
Main.cc:38:44: error: no match for ‘operator=’ (operand types are ‘radixsort(ll)::<lambda()>’ and ‘ll’ {aka ‘int’})
   38 |             [cnt[x[j] >> i & mask]++] = x[j];
      |                                            ^
Main.cc:38:37: note: candidate: ‘radixsort(ll)::<lambda()>& radixsort(ll)::<lambda()>::operator=(const radixsort(ll)::<lambda()>&)’ <deleted>
   38 |             [cnt[x[j] >> i & mask]++] = x[j];
      |                                     ^
Main.cc:38:37: note:   no known conversion for argument 1 from ‘ll’ {aka ‘int’} to ‘const radixsort(ll)::<lambda()>&’