answer.code:117:4: warning: structured bindings only available with ‘-std=c++17’ or ‘-std=gnu++17’ [-Wc++17-extensions]
  117 | int[] construct_permutation(ll k) {
      |    ^
answer.code:117:4: error: structured binding declaration cannot have type ‘int’
  117 | int[] construct_permutation(ll k) {
      |    ^~
answer.code:117:4: note: type must be cv-qualified ‘auto’ or reference to cv-qualified ‘auto’
answer.code:117:4: error: empty structured binding declaration
answer.code:117:7: error: expected initializer before ‘construct_permutation’
  117 | int[] construct_permutation(ll k) {
      |       ^~~~~~~~~~~~~~~~~~~~~