Language: C++

#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <stack>
#include <queue>
#include <bitset>
#include <numeric>
#ifdef DEBUG
#include "./Lib/debug.hpp"
#else
#define dump(...)
#pragma GCC optimize ("O3")
template<class T>inline auto d_val(T a, T b) { return a; }
#endif

/* (=＾o＾=) */
// #define int ll

/* macro */
#define FOR(i, b, e) for(ll i = (ll)(b); i < (ll)(e); ++i)
#define RFOR(i, b, e) for(ll i = (ll)(e-1); i >= (ll)(b); --i)
#define REP(i, n) FOR(i, 0, n)
#define RREP(i, n) RFOR(i, 0, n)
#define REPC(x,c) for(const auto& x:(c))
#define REPI2(it,b,e) for(auto it = (b); it != (e); ++it)
#define REPI(it,c) REPI2(it, (c).begin(), (c).end())
#define RREPI(it,c) REPI2(it, (c).rbegin(), (c).rend())
#define REPI_ERACE2(it, b, e) for(auto it = (b); it != (e);)
#define REPI_ERACE(it, c) REPI_ERACE2(it, (c).begin(), (c).end())
#define ALL(x) (x).begin(),(x).end()
#define cauto const auto&
/* macro func */
#define SORT(x) do{sort(ALL(x));}while(false)
#define RSORT(x) do{sort((x).rbegin(),(x).rend());}while(false)
#define UNIQUE(v) do{v.erase( unique(v.begin(), v.end()), v.end() );}while(false)
#define MAX(x,y) do{x = std::max(x,y);}while(false)
#define MIN(x,y) do{x = std::min(x,y);}while(false)
#define BR do{cout<<"\n";}while(false)

/* type define */
using ll = long long;
using PAIR = std::pair<ll, ll>;
using VS = std::vector<std::string>;
using VL = std::vector<long long>;
using VVL = std::vector<VL>;
using VVVL = std::vector<VVL>;
using VD = std::vector<double>;

/* using std */
using std::cout;
constexpr char endl = '\n';
using std::cin;
using std::sort;
using std::pair;
using std::string;
using std::stack;
using std::queue;
using std::vector;
using std::list;
using std::map;
using std::unordered_map;
using std::multimap;
using std::unordered_multimap;
using std::set;
using std::unordered_set;
using std::unordered_multiset;
using std::multiset;
using std::bitset;
using std::priority_queue;

/* constant value */
// constexpr ll MOD = 1000000007;
constexpr ll MOD = 998244353;

/* Initial processing  */
struct Preprocessing { Preprocessing() { std::cin.tie(0); std::ios::sync_with_stdio(0); }; }_Preprocessing;

/* define hash */
namespace std { template <>	class hash<std::pair<ll, ll>> { public:	size_t operator()(const std::pair<ll, ll>& x) const { return hash<ll>()(1000000000 * x.first + x.second); } }; }

/* input */
template<class T> std::istream& operator >> (std::istream& is, vector<T>& vec) { for (T& x : vec) is >> x; return is; }

//=============================================================================================

VL out;
unordered_map<ll, PAIR> mp;
VL v;
ll n;

list<ll> set(ll t) {
	if (out[t] < -1e6) { return {}; }

	auto lst = set(std::abs(out[t]));
	if (out[t] > 0) {
		lst.emplace_front(v[t]);
	}
	return lst;
}

ll f(ll t) {
	if (out[t] < -1e6) { return -1; }

	if (out[t] > 0) {
		return v[t];
	} else {
		f(-out[t]);
	}

}
signed main() {
	ll k;
	cin >> n >> k;
	v = VL(n);
	cin >> v;

	out = VL(n + 1);
	out[n] = -1e7;
	RREP(i, n) {
		if (mp.find(v[i]) == mp.end()) {
			mp[v[i]] = {i,0};
			out[i] = i + 1;
		} else {
			ll it = mp[v[i]].first + 1;
			out[i] = -it;
		}
		ll val = mp[v[i]].second + 1;
		mp[v[i]] = {i,val};
	}

	ll cnt = 1;
	ll t = f(0);
	VL ans;
	ans.emplace_back(0);
	while (true) {
		if (t == -1) { break; }
		ans.emplace_back(mp[t].first + 1);
		t = f(mp[t].first + 1);
		++cnt;
	}

	k = (k - 1 + cnt) % cnt;
	REPC(x, set(ans[k])) {
		cout << x << " ";
	}
	cout << endl;
	/**
	dump(ans, cnt);

	REPC(i, ans) {
		cout << f(i) << " -> ";
		REPC(x, set(i)) {
			cout << x << " ";
		}BR;
	}
	dump(out);
	/*//**/
}

Compiler output:
a.cc:99:18: error: 'std::__cxx11::list<long long int> set(ll)' redeclared as different kind of entity
   99 | list<ll> set(ll t) {
      |                  ^
In file included from /usr/include/c++/14/set:63,
                 from a.cc:7:
/usr/include/c++/14/bits/stl_set.h:96:11: note: previous declaration 'template<class _Key, class _Compare, class _Alloc> class std::set'
   96 |     class set
      |           ^~~
a.cc: In function 'std::__cxx11::list<long long int> set(ll)':
a.cc:102:40: error: class template argument deduction failed:
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
a.cc:102:40: error: no matching function for call to 'set(long long int)'
/usr/include/c++/14/bits/stl_set.h:273:9: note: candidate: 'template<class _Key, class _Compare, class _Alloc, class _InputIterator> set(_InputIterator, _InputIterator, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  273 |         set(_InputIterator __first, _InputIterator __last,
      |         ^~~
/usr/include/c++/14/bits/stl_set.h:273:9: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:267:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::initializer_list<_Tp>, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  267 |       set(initializer_list<value_type> __l, const allocator_type& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:267:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:261:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::set<_Key, _Compare, _Allocator>&&, std::__type_identity_t<_Alloc>&)-> std::set<_Key, _Compare, _Alloc>'
  261 |       set(set&& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:261:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:257:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(const std::set<_Key, _Compare, _Allocator>&, std::__type_identity_t<_Alloc>&)-> std::set<_Key, _Compare, _Alloc>'
  257 |       set(const set& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:257:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:253:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  253 |       set(const allocator_type& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:253:7: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   couldn't deduce template parameter '_Key'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:245:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::initializer_list<_Tp>, const _Compare&, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  245 |       set(initializer_list<value_type> __l,
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:245:7: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:233:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::set<_Key, _Compare, _Allocator>&&)-> std::set<_Key, _Compare, _Alloc>'
  233 |       set(set&&) = default;
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:233:7: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   mismatched types 'std::set<_Key, _Compare, _Allocator>' and 'long long int'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:225:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(const std::set<_Key, _Compare, _Allocator>&)-> std::set<_Key, _Compare, _Alloc>'
  225 |       set(const set&) = default;
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:225:7: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   mismatched types 'const std::set<_Key, _Compare, _Allocator>' and 'long long int'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:210:9: note: candidate: 'template<class _Key, class _Compare, class _Alloc, class _InputIterator> set(_InputIterator, _InputIterator, const _Compare&, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  210 |         set(_InputIterator __first, _InputIterator __last,
      |         ^~~
/usr/include/c++/14/bits/stl_set.h:210:9: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:193:9: note: candidate: 'template<class _Key, class _Compare, class _Alloc, class _InputIterator> set(_InputIterator, _InputIterator)-> std::set<_Key, _Compare, _Alloc>'
  193 |         set(_InputIterator __first, _InputIterator __last)
      |         ^~~
/usr/include/c++/14/bits/stl_set.h:193:9: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:178:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(const _Compare&, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  178 |       set(const _Compare& __comp,
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:178:7: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   couldn't deduce template parameter '_Key'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:169:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set()-> std::set<_Key, _Compare, _Alloc>'
  169 |       set() = default;
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:169:7: note:   candidate expects 0 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:96:11: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::set<_Key, _Compare, _Alloc>)-> std::set<_Key, _Compare, _Alloc>'
   96 |     class set
      |           ^~~
/usr/include/c++/14/bits/stl_set.h:96:11: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   mismatched types 'std::set<_Key, _Compare, _Alloc>' and 'long long int'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:970:5: note: candidate: 'template<class _Key, class _Allocator, class> std::set(initializer_list<_Tp>, _Allocator)-> set<_Key, less<_Key>, _Allocator>'
  970 |     set(initializer_list<_Key>, _Allocator)
      |     ^~~
/usr/include/c++/14/bits/stl_set.h:970:5: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:963:5: note: candidate: 'template<class _InputIterator, class _Allocator, class, class> std::set(_InputIterator, _InputIterator, _Allocator)-> set<typename iterator_traits<_Iter>::value_type, less<typename iterator_traits< <template-parameter-1-1> >::value_type>, _Allocator>'
  963 |     set(_InputIterator, _InputIterator, _Allocator)
      |     ^~~
/usr/include/c++/14/bits/stl_set.h:963:5: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:956:5: note: candidate: 'template<class _Key, class _Compare, class _Allocator, class, class> std::set(initializer_list<_Tp>, _Compare, _Allocator)-> set<_Key, _Compare, _Allocator>'
  956 |     set(initializer_list<_Key>,
      |     ^~~
/usr/include/c++/14/bits/stl_set.h:956:5: note:   template argument deduction/substitution failed:
a.cc:102:40: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
  102 |         auto lst = set(std::abs(out[t]));
      |                                        ^
/usr/include/c++/14/bits/stl_set.h:947:5: note: candidate: 'template<class _InputIterator, class _Compare, class _Allocator, class, class, class> std::set(_InputIterator, _InputIterator, _Compare, _Allocator)-> set<typename iterator_traits<_Iter>::value_type, _Compare, _Allocator>'
  947 |     set(_InputIterator, _InputIterator,
      |     ^~~
/usr/include/c++/14/bits/stl_set.h:947:5: note:   candidate expects 2 arguments, 1 provided
a.cc: In function 'int main()':
a.cc:151:27: error: class template argument deduction failed:
  151 |         REPC(x, set(ans[k])) {
      |                           ^
a.cc:32:38: note: in definition of macro 'REPC'
   32 | #define REPC(x,c) for(const auto& x:(c))
      |                                      ^
a.cc:151:27: error: no matching function for call to 'set(__gnu_cxx::__alloc_traits<std::allocator<long long int>, long long int>::value_type&)'
  151 |         REPC(x, set(ans[k])) {
      |                           ^
a.cc:32:38: note: in definition of macro 'REPC'
   32 | #define REPC(x,c) for(const auto& x:(c))
      |                                      ^
/usr/include/c++/14/bits/stl_set.h:273:9: note: candidate: 'template<class _Key, class _Compare, class _Alloc, class _InputIterator> set(_InputIterator, _InputIterator, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  273 |         set(_InputIterator __first, _InputIterator __last,
      |         ^~~
/usr/include/c++/14/bits/stl_set.h:273:9: note:   candidate expects 3 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:267:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::initializer_list<_Tp>, const _Alloc&)-> std::set<_Key, _Compare, _Alloc>'
  267 |       set(initializer_list<value_type> __l, const allocator_type& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:267:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_set.h:261:7: note: candidate: 'template<class _Key, class _Compare, class _Alloc> set(std::set<_Key, _Compare, _Allocator>&&, std::__type_identity_t<_Alloc>&)-> std::set<_Key, _Compare, _Alloc>'
  261 |       set(set&& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~
/usr/include/c++/14/bits/stl_set.h:261:7: n