結果
| 問題 | No.2704 L to R Graph |
| ユーザー |
 suisen
|
| 提出日時 | 2024-03-29 23:22:49 |
| 言語 | C++17 (gcc 12.3.0 + boost 1.83.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 33,280 bytes |
| コンパイル時間 | 2,800 ms |
| コンパイル使用メモリ | 240,024 KB |
| 実行使用メモリ | 26,584 KB |
| 最終ジャッジ日時 | 2024-09-30 16:54:53 |
| 合計ジャッジ時間 | 8,972 ms |
|
ジャッジサーバーID （参考情報） |
judge4 / judge3 |
（要ログイン）
テストケース
テストケース表示| 入力 | 結果 | 実行時間 実行使用メモリ |
|---|---|---|
| testcase_00 | AC | 2 ms
10,496 KB |
| testcase_01 | AC | 2 ms
5,248 KB |
| testcase_02 | AC | 2 ms
5,248 KB |
| testcase_03 | WA | - |
| testcase_04 | WA | - |
| testcase_05 | WA | - |
| testcase_06 | WA | - |
| testcase_07 | WA | - |
| testcase_08 | WA | - |
| testcase_09 | WA | - |
| testcase_10 | WA | - |
| testcase_11 | AC | 77 ms
21,464 KB |
| testcase_12 | WA | - |
| testcase_13 | WA | - |
| testcase_14 | WA | - |
| testcase_15 | WA | - |
| testcase_16 | WA | - |
| testcase_17 | WA | - |
| testcase_18 | WA | - |
| testcase_19 | WA | - |
| testcase_20 | WA | - |
| testcase_21 | TLE | - |
| testcase_22 | -- | - |
| testcase_23 | -- | - |
| testcase_24 | -- | - |
| testcase_25 | -- | - |
| testcase_26 | -- | - |
| testcase_27 | -- | - |
| testcase_28 | -- | - |
ソースコード
#include <bits/stdc++.h>
namespace suisen {
template <class T> bool chmin(T& x, const T& y) { return y >= x ? false : (x = y, true); }
template <class T> bool chmax(T& x, const T& y) { return y <= x ? false : (x = y, true); }
template <class T> constexpr int pow_m1(T n) { return -(n & 1) | 1; }
template <class T> constexpr T fld(const T x, const T y) { T q = x / y, r = x % y; return q - ((x ^ y) < 0 and (r != 0)); }
template <class T> constexpr T cld(const T x, const T y) { T q = x / y, r = x % y; return q + ((x ^ y) > 0 and (r != 0)); }
}
namespace suisen::macro {
#define IMPL_REPITER(cond) auto& begin() { return *this; } auto end() { return nullptr; } auto& operator*() { return _val; } auto& operator++() { return _val += _step, *this; } bool operator!=(std::nullptr_t) { return cond; }
template <class Int, class IntL = Int, class IntStep = Int, std::enable_if_t<(std::is_signed_v<Int> == std::is_signed_v<IntL>), std::nullptr_t> = nullptr> struct rep_impl {
Int _val; const Int _end, _step;
rep_impl(Int n) : rep_impl(0, n) {}
rep_impl(IntL l, Int r, IntStep step = 1) : _val(l), _end(r), _step(step) {}
IMPL_REPITER((_val < _end))
};
template <class Int, class IntL = Int, class IntStep = Int, std::enable_if_t<(std::is_signed_v<Int> == std::is_signed_v<IntL>), std::nullptr_t> = nullptr> struct rrep_impl {
Int _val; const Int _end, _step;
rrep_impl(Int n) : rrep_impl(0, n) {}
rrep_impl(IntL l, Int r) : _val(r - 1), _end(l), _step(-1) {}
rrep_impl(IntL l, Int r, IntStep step) : _val(l + fld<Int>(r - l - 1, step) * step), _end(l), _step(-step) {}
IMPL_REPITER((_val >= _end))
};
template <class Int, class IntStep = Int> struct repinf_impl {
Int _val; const Int _step;
repinf_impl(Int l, IntStep step = 1) : _val(l), _step(step) {}
IMPL_REPITER((true))
};
#undef IMPL_REPITER
}
#include <iostream>
#include <limits>
#include <type_traits>
namespace suisen {
template <typename ...Constraints> using constraints_t = std::enable_if_t<std::conjunction_v<Constraints...>, std::nullptr_t>;
template <typename T, typename = std::nullptr_t> struct bitnum { static constexpr int value = 0; };
template <typename T> struct bitnum<T, constraints_t<std::is_integral<T>>> { static constexpr int value = std::numeric_limits<std::make_unsigned_t<T>>::digits; };
template <typename T> static constexpr int bitnum_v = bitnum<T>::value;
template <typename T, size_t n> struct is_nbit { static constexpr bool value = bitnum_v<T> == n; };
template <typename T, size_t n> static constexpr bool is_nbit_v = is_nbit<T, n>::value;
template <typename T, typename = std::nullptr_t> struct safely_multipliable { using type = T; };
template <typename T> struct safely_multipliable<T, constraints_t<std::is_signed<T>, is_nbit<T, 32>>> { using type = long long; };
template <typename T> struct safely_multipliable<T, constraints_t<std::is_signed<T>, is_nbit<T, 64>>> { using type = __int128_t; };
template <typename T> struct safely_multipliable<T, constraints_t<std::is_unsigned<T>, is_nbit<T, 32>>> { using type = unsigned long long; };
template <typename T> struct safely_multipliable<T, constraints_t<std::is_unsigned<T>, is_nbit<T, 64>>> { using type = __uint128_t; };
template <typename T> using safely_multipliable_t = typename safely_multipliable<T>::type;
template <typename T, typename = void> struct rec_value_type { using type = T; };
template <typename T> struct rec_value_type<T, std::void_t<typename T::value_type>> {
using type = typename rec_value_type<typename T::value_type>::type;
};
template <typename T> using rec_value_type_t = typename rec_value_type<T>::type;
template <typename T> class is_iterable {
template <typename T_> static auto test(T_ e) -> decltype(e.begin(), e.end(), std::true_type{});
static std::false_type test(...);
public:
static constexpr bool value = decltype(test(std::declval<T>()))::value;
};
template <typename T> static constexpr bool is_iterable_v = is_iterable<T>::value;
template <typename T> class is_writable {
template <typename T_> static auto test(T_ e) -> decltype(std::declval<std::ostream&>() << e, std::true_type{});
static std::false_type test(...);
public:
static constexpr bool value = decltype(test(std::declval<T>()))::value;
};
template <typename T> static constexpr bool is_writable_v = is_writable<T>::value;
template <typename T> class is_readable {
template <typename T_> static auto test(T_ e) -> decltype(std::declval<std::istream&>() >> e, std::true_type{});
static std::false_type test(...);
public:
static constexpr bool value = decltype(test(std::declval<T>()))::value;
};
template <typename T> static constexpr bool is_readable_v = is_readable<T>::value;
} // namespace suisen
namespace suisen::io {
template <typename IStream, std::enable_if_t<std::conjunction_v<std::is_base_of<std::istream, std::remove_reference_t<IStream>>, std::negation<std::is_const<std::remove_reference_t<IStream>>>>, std::nullptr_t> = nullptr>
struct InputStream {
private:
using istream_type = std::remove_reference_t<IStream>;
IStream is;
struct { InputStream* is; template <typename T> operator T() { T e; *is >> e; return e; } } _reader{ this };
public:
template <typename IStream_> InputStream(IStream_ &&is) : is(std::move(is)) {}
template <typename IStream_> InputStream(IStream_ &is) : is(is) {}
template <typename T> InputStream& operator>>(T& e) {
if constexpr (suisen::is_readable_v<T>) is >> e; else _read(e);
return *this;
}
auto read() { return _reader; }
template <typename Head, typename... Tail>
void read(Head& head, Tail &...tails) { ((*this >> head) >> ... >> tails); }
istream_type& get_stream() { return is; }
private:
static __uint128_t _stou128(const std::string& s) {
__uint128_t ret = 0;
for (char c : s) if ('0' <= c and c <= '9') ret = 10 * ret + c - '0';
return ret;
}
static __int128_t _stoi128(const std::string& s) { return (s[0] == '-' ? -1 : +1) * _stou128(s); }
void _read(__uint128_t& v) { v = _stou128(std::string(_reader)); }
void _read(__int128_t& v) { v = _stoi128(std::string(_reader)); }
template <typename T, typename U>
void _read(std::pair<T, U>& a) { *this >> a.first >> a.second; }
template <size_t N = 0, typename ...Args>
void _read(std::tuple<Args...>& a) { if constexpr (N < sizeof...(Args)) *this >> std::get<N>(a), _read<N + 1>(a); }
template <typename Iterable, std::enable_if_t<suisen::is_iterable_v<Iterable>, std::nullptr_t> = nullptr>
void _read(Iterable& a) { for (auto& e : a) *this >> e; }
};
template <typename IStream>
InputStream(IStream &&) -> InputStream<IStream>;
template <typename IStream>
InputStream(IStream &) -> InputStream<IStream&>;
InputStream cin{ std::cin };
auto read() { return cin.read(); }
template <typename Head, typename... Tail>
void read(Head& head, Tail &...tails) { cin.read(head, tails...); }
} // namespace suisen::io
namespace suisen { using io::read; } // namespace suisen
namespace suisen::io {
template <typename OStream, std::enable_if_t<std::conjunction_v<std::is_base_of<std::ostream, std::remove_reference_t<OStream>>, std::negation<std::is_const<std::remove_reference_t<OStream>>>>, std::nullptr_t> = nullptr>
struct OutputStream {
private:
using ostream_type = std::remove_reference_t<OStream>;
OStream os;
public:
template <typename OStream_> OutputStream(OStream_ &&os) : os(std::move(os)) {}
template <typename OStream_> OutputStream(OStream_ &os) : os(os) {}
template <typename T> OutputStream& operator<<(const T& e) {
if constexpr (suisen::is_writable_v<T>) os << e; else _print(e);
return *this;
}
void print() { *this << '\n'; }
template <typename Head, typename... Tail>
void print(const Head& head, const Tail &...tails) { *this << head, ((*this << ' ' << tails), ...), *this << '\n'; }
template <typename Iterable, std::enable_if_t<suisen::is_iterable_v<Iterable>, std::nullptr_t> = nullptr>
void print_all(const Iterable& v, std::string sep = " ", std::string end = "\n") {
for (auto it = v.begin(); it != v.end();) if (*this << *it; ++it != v.end()) *this << sep;
*this << end;
}
ostream_type& get_stream() { return os; }
private:
void _print(__uint128_t value) {
char buffer[41], *d = std::end(buffer);
do *--d = '0' + (value % 10), value /= 10; while (value);
os.rdbuf()->sputn(d, std::end(buffer) - d);
}
void _print(__int128_t value) {
if (value < 0) *this << '-';
_print(__uint128_t(value < 0 ? -value : value));
}
template <typename T, typename U>
void _print(const std::pair<T, U>& a) { *this << a.first << ' ' << a.second; }
template <size_t N = 0, typename ...Args>
void _print(const std::tuple<Args...>& a) {
if constexpr (N < std::tuple_size_v<std::tuple<Args...>>) {
if constexpr (N) *this << ' ';
*this << std::get<N>(a), _print<N + 1>(a);
}
}
template <typename Iterable, std::enable_if_t<suisen::is_iterable_v<Iterable>, std::nullptr_t> = nullptr>
void _print(const Iterable& a) { print_all(a, " ", ""); }
};
template <typename OStream_>
OutputStream(OStream_ &&) -> OutputStream<OStream_>;
template <typename OStream_>
OutputStream(OStream_ &) -> OutputStream<OStream_&>;
OutputStream cout{ std::cout }, cerr{ std::cerr };
template <typename... Args>
void print(const Args &... args) { cout.print(args...); }
template <typename Iterable, std::enable_if_t<suisen::is_iterable_v<Iterable>, std::nullptr_t> = nullptr>
void print_all(const Iterable& v, const std::string& sep = " ", const std::string& end = "\n") { cout.print_all(v, sep, end); }
} // namespace suisen::io
namespace suisen { using io::print, io::print_all; } // namespace suisen
namespace suisen {
template <class T, class ToKey, class CompKey = std::less<>, std::enable_if_t<std::conjunction_v<std::is_invocable<ToKey, T>, std::is_invocable_r<bool, CompKey, std::invoke_result_t<ToKey, T>, std::invoke_result_t<ToKey, T>>>, std::nullptr_t> = nullptr>
auto comparator(const ToKey& to_key, const CompKey& comp_key = std::less<>()) {
return [=](const T& x, const T& y) { return comp_key(to_key(x), to_key(y)); };
}
template <class Compare, std::enable_if_t<std::is_invocable_r_v<bool, Compare, int, int>, std::nullptr_t> = nullptr>
std::vector<int> sorted_indices(int n, const Compare& compare) {
std::vector<int> p(n);
return std::iota(p.begin(), p.end(), 0), std::sort(p.begin(), p.end(), compare), p;
}
template <class ToKey, std::enable_if_t<std::is_invocable_v<ToKey, int>, std::nullptr_t> = nullptr>
std::vector<int> sorted_indices(int n, const ToKey& to_key) { return sorted_indices(n, comparator<int>(to_key)); }
template <class T, class Comparator>
auto priority_queue_with_comparator(const Comparator& comparator) { return std::priority_queue<T, std::vector<T>, Comparator>{ comparator }; }
template <class Iterable, std::enable_if_t<suisen::is_iterable_v<Iterable>, std::nullptr_t> = nullptr>
void sort_unique_erase(Iterable& a) { std::sort(a.begin(), a.end()), a.erase(std::unique(a.begin(), a.end()), a.end()); }
template <size_t D> struct Dim : std::array<int, D> {
template <typename ...Ints> Dim(const Ints& ...ns) : std::array<int, D>::array{ static_cast<int>(ns)... } {}
};
template <typename ...Ints> Dim(const Ints& ...) -> Dim<sizeof...(Ints)>;
template <class T, size_t D, size_t I = 0>
auto ndvec(const Dim<D> &ns, const T& value = {}) {
if constexpr (I + 1 < D) {
return std::vector(ns[I], ndvec<T, D, I + 1>(ns, value));
} else {
return std::vector<T>(ns[I], value);
}
}
}
namespace suisen {
using int128 = __int128_t;
using uint128 = __uint128_t;
template <class T> using min_priority_queue = std::priority_queue<T, std::vector<T>, std::greater<T>>;
template <class T> using max_priority_queue = std::priority_queue<T, std::vector<T>, std::less<T>>;
}
namespace suisen { const std::string Yes = "Yes", No = "No", YES = "YES", NO = "NO"; }
#ifdef LOCAL
# define debug(...) debug_impl(#__VA_ARGS__, __VA_ARGS__)
template <class H, class... Ts> void debug_impl(const char* s, const H& h, const Ts&... t) {
suisen::io::cerr << "[\033[32mDEBUG\033[m] " << s << ": " << h, ((suisen::io::cerr << ", " << t), ..., (suisen::io::cerr << "\n"));
}
#else
# define debug(...) void(0)
#endif
#define FOR(e, v) for (auto &&e : v)
#define CFOR(e, v) for (const auto &e : v)
#define REP(i, ...) CFOR(i, suisen::macro::rep_impl(__VA_ARGS__))
#define RREP(i, ...) CFOR(i, suisen::macro::rrep_impl(__VA_ARGS__))
#define REPINF(i, ...) CFOR(i, suisen::macro::repinf_impl(__VA_ARGS__))
#define LOOP(n) for ([[maybe_unused]] const auto& _ : suisen::macro::rep_impl(n))
#define ALL(iterable) std::begin(iterable), std::end(iterable)
using namespace suisen;
using namespace std;
struct io_setup {
io_setup(int precision = 20) {
std::ios::sync_with_stdio(false), std::cin.tie(nullptr);
std::cout << std::fixed << std::setprecision(precision);
}
} io_setup_ {};
constexpr int iinf = std::numeric_limits<int>::max() / 2;
constexpr long long linf = std::numeric_limits<long long>::max() / 2;
#include <cassert>
#include <cstdint>
#include <optional>
#include <tuple>
#include <utility>
#include <vector>
namespace suisen {
struct FunctionalGraph {
struct Doubling;
template <typename T, T(*)(T, T), T(*)()>
struct DoublingSum;
friend struct Doubling;
template <typename T, T(*op)(T, T), T(*e)()>
friend struct DoublingSum;
FunctionalGraph() : FunctionalGraph(0) {}
FunctionalGraph(int n) : _n(n), _nxt(n) {}
FunctionalGraph(const std::vector<int>& nxt) : _n(nxt.size()), _nxt(nxt) {}
const int& operator[](int u) const {
return _nxt[u];
}
int& operator[](int u) {
return _nxt[u];
}
struct Doubling {
friend struct FunctionalGraph;
int query(int u, long long d) const {
for (int l = _log; l >= 0; --l) if ((d >> l) & 1) u = _nxt[l][u];
return u;
}
struct BinarySearchResult {
int v;
long long step;
operator std::pair<int, long long>() const { return std::pair<int, long long>{ v, step }; }
};
template <typename Pred>
auto max_step(int u, Pred &&f) const {
assert(f(u));
long long step = 0;
for (int l = _log; l >= 0; --l) if (int nxt_u = _nxt[l][u]; f(nxt_u)) {
u = nxt_u, step |= 1LL << l;
}
return BinarySearchResult{ u, step };
}
template <typename Pred>
std::optional<BinarySearchResult> step_until(int u, Pred &&f) const {
if (f(u)) return BinarySearchResult { u, 0 };
auto [v, step] = max_step(u, [&](int v) { return not f(v); });
v = _nxt[0][v], ++step;
if (not f(v)) return std::nullopt;
return BinarySearchResult{ v, step };
}
private:
int _n, _log;
std::vector<std::vector<int>> _nxt;
Doubling(const std::vector<int>& nxt, long long max_step) : _n(nxt.size()), _log(floor_log2(max_step)), _nxt(_log + 1, std::vector<int>(_n)) {
_nxt[0] = nxt;
for (int i = 1; i <= _log; ++i) for (int j = 0; j < _n; ++j) {
_nxt[i][j] = _nxt[i - 1][_nxt[i - 1][j]];
}
}
};
template <typename T, T(*op)(T, T), T(*e)()>
struct DoublingSum : private Doubling {
friend struct FunctionalGraph;
struct Result {
int v;
T sum;
operator std::pair<int, T>() const { return std::pair<int, T>{ v, sum }; }
};
auto query(int u, long long d) const {
T sum = e();
for (int l = _log; l >= 0; --l) if ((d >> l) & 1) sum = op(sum, _dat[l][std::exchange(u, _nxt[l][u])]);
return Result{ u, sum };
}
struct BinarySearchResult {
int v;
T sum;
long long step;
operator std::tuple<int, T, long long>() const { return std::tuple<int, T, long long>{ v, sum, step }; }
};
template <typename Pred>
auto max_step(int u, Pred &&f) const {
assert(f(e()));
long long step = 0;
T sum = e();
for (int l = _log; l >= 0; --l) {
if (T nxt_sum = op(sum, _dat[l][u]); f(nxt_sum)) {
sum = std::move(nxt_sum), u = _nxt[l][u], step |= 1LL << l;
}
}
return BinarySearchResult{ u, sum, step };
}
template <typename Pred>
std::optional<BinarySearchResult> step_until(int u, Pred &&f) const {
if (f(e())) return BinarySearchResult { u, e(), 0 };
auto [v, sum, step] = max_step(u, [&](const T& v) { return not f(v); });
sum = op(sum, _dat[0][v]), v = _nxt[0][v], ++step;
if (not f(sum)) return std::nullopt;
return BinarySearchResult{ v, sum, step };
}
private:
std::vector<std::vector<T>> _dat;
DoublingSum(const std::vector<int>& nxt, long long max_step, const std::vector<T>& dat) : Doubling(nxt, max_step), _dat(_log + 1, std::vector<T>(_n, e())) {
_dat[0] = dat;
for (int i = 1; i <= _log; ++i) for (int j = 0; j < _n; ++j) {
_dat[i][j] = op(_dat[i - 1][j], _dat[i - 1][_nxt[i - 1][j]]);
}
}
};
Doubling doubling(long long max_step) const {
return Doubling(_nxt, max_step);
}
template <typename T, T(*op)(T, T), T(*e)()>
DoublingSum<T, op, e> doubling(long long max_step, const std::vector<T>& dat) const {
return DoublingSum<T, op, e>(_nxt, max_step, dat);
}
struct InfinitePath {
int head_v;
int head_len;
int loop_v;
int loop_len;
InfinitePath() = default;
InfinitePath(int head_v, int head_len, int loop_v, int loop_len) : head_v(head_v), head_len(head_len), loop_v(loop_v), loop_len(loop_len) {}
};
std::vector<InfinitePath> infinite_paths() const {
std::vector<InfinitePath> res(_n);
std::vector<int> vis(_n, _n);
std::vector<int> dep(_n, 0);
int time = 0;
auto dfs = [&](auto dfs, int u) -> int {
vis[u] = time;
int v = _nxt[u];
if (vis[v] == vis[u]) { // found cycle
int loop_len = dep[u] - dep[v] + 1;
res[u] = { u, 0, u, loop_len };
return loop_len - 1;
} else if (vis[v] < vis[u]) {
res[u] = { u, res[v].head_len + 1, res[v].loop_v, res[v].loop_len };
return 0;
} else {
dep[v] = dep[u] + 1;
int c = dfs(dfs, v);
if (c > 0) { // in cycle
res[u] = { u, 0, u, res[v].loop_len };
return c - 1;
} else { // out of cycle
res[u] = { u, res[v].head_len + 1, res[v].loop_v, res[v].loop_len };
return 0;
}
}
};
for (int i = 0; i < _n; ++i, ++time) if (vis[i] == _n) dfs(dfs, i);
return res;
}
/**
* Calculates k'th iterate: f(f(f(...f(i)))) for all 0 <= i < N in O(N) time.
* Reference: https://noshi91.hatenablog.com/entry/2019/09/22/114149
*/
std::vector<int> kth_iterate(const long long k) const {
assert(k >= 0);
std::vector<int> res(_n);
std::vector<int> forest_roots;
std::vector<std::vector<int>> forest(_n);
std::vector<std::vector<std::pair<long long, int>>> qs(_n);
for (const auto& path : infinite_paths()) {
const int v = path.head_v;
(path.head_len == 0 ? forest_roots : forest[_nxt[v]]).push_back(v);
if (path.head_len >= k) continue;
qs[path.loop_v].emplace_back(k - path.head_len, v);
}
std::vector<int> dfs_path(_n);
auto dfs = [&](auto dfs, int u, int d) -> void {
dfs_path[d] = u;
if (d >= k) res[u] = dfs_path[d - k];
for (int v : forest[u]) dfs(dfs, v, d + 1);
};
for (int root : forest_roots) dfs(dfs, root, 0);
std::vector<int8_t> seen(_n, false);
for (int root : forest_roots) {
if (seen[root]) continue;
std::vector<int> cycle{ root };
for (int v = _nxt[root]; v != root; v = _nxt[v]) cycle.push_back(v);
const int len = cycle.size();
for (int i = 0; i < len; ++i) {
const int s = cycle[i];
seen[s] = true;
for (const auto& [rem, res_index] : qs[s]) {
res[res_index] = cycle[(i + rem) % len];
}
}
}
return res;
}
private:
int _n;
std::vector<int> _nxt;
static int floor_log2(long long v) {
int l = 0;
while (1LL << (l + 1) <= v) ++l;
return l;
}
};
} // namespace suisen
namespace suisen {
class HeavyLightDecomposition {
public:
template <typename Q>
using is_point_update_query = std::is_invocable<Q, int>;
template <typename Q>
using is_range_update_query = std::is_invocable<Q, int, int>;
template <typename Q, typename T>
using is_point_get_query = std::is_same<std::invoke_result_t<Q, int>, T>;
template <typename Q, typename T>
using is_range_fold_query = std::is_same<std::invoke_result_t<Q, int, int>, T>;
using Graph = std::vector<std::vector<int>>;
HeavyLightDecomposition() = default;
HeavyLightDecomposition(Graph &g) : n(g.size()), visit(n), leave(n), head(n), ord(n), siz(n), par(n, -1), dep(n, 0) {
for (int i = 0; i < n; ++i) if (par[i] < 0) dfs(g, i, -1);
int time = 0;
for (int i = 0; i < n; ++i) if (par[i] < 0) hld(g, i, -1, time);
}
HeavyLightDecomposition(Graph &g, const std::vector<int> &roots) : n(g.size()), visit(n), leave(n), head(n), ord(n), siz(n), par(n, -1), dep(n, 0) {
for (int i : roots) dfs(g, i, -1);
int time = 0;
for (int i : roots) hld(g, i, -1, time);
}
int size() const {
return n;
}
int lca(int u, int v) const {
for (;; v = par[head[v]]) {
if (visit[u] > visit[v]) std::swap(u, v);
if (head[u] == head[v]) return u;
}
}
int la(int u, int k, int default_value = -1) const {
if (k < 0) return default_value;
while (u >= 0) {
int h = head[u];
if (visit[u] - k >= visit[h]) return ord[visit[u] - k];
k -= visit[u] - visit[h] + 1;
u = par[h];
}
return default_value;
}
int jump(int u, int v, int d, int default_value = -1) const {
if (d < 0) return default_value;
const int w = lca(u, v);
int uw = dep[u] - dep[w];
if (d <= uw) return la(u, d);
int vw = dep[v] - dep[w];
return d <= uw + vw ? la(v, (uw + vw) - d) : default_value;
}
int dist(int u, int v) const {
return dep[u] + dep[v] - 2 * dep[lca(u, v)];
}
template <typename T, typename Q, typename F, constraints_t<is_range_fold_query<Q, T>, std::is_invocable_r<T, F, T, T>> = nullptr>
T fold_path(int u, int v, T identity, F bin_op, Q fold_query, bool is_edge_query = false) const {
T res = identity;
for (;; v = par[head[v]]) {
if (visit[u] > visit[v]) std::swap(u, v);
if (head[u] == head[v]) break;
res = bin_op(fold_query(visit[head[v]], visit[v] + 1), res);
}
return bin_op(fold_query(visit[u] + is_edge_query, visit[v] + 1), res);
}
template <
typename T, typename Q1, typename Q2, typename F,
constraints_t<is_range_fold_query<Q1, T>, is_range_fold_query<Q2, T>, std::is_invocable_r<T, F, T, T>> = nullptr
>
T fold_path_noncommutative(int u, int v, T identity, F bin_op, Q1 fold_query, Q2 fold_query_rev, bool is_edge_query = false) const {
T res_u = identity, res_v = identity;
// a := lca(u, v)
// res = fold(u -> a) + fold(a -> v)
while (head[u] != head[v]) {
if (visit[u] < visit[v]) { // a -> v
res_v = bin_op(fold_query(visit[head[v]], visit[v] + 1), res_v);
v = par[head[v]];
} else { // u -> a
res_u = bin_op(res_u, fold_query_rev(visit[head[u]], visit[u] + 1));
u = par[head[u]];
}
}
if (visit[u] < visit[v]) { // a = u
res_v = bin_op(fold_query(visit[u] + is_edge_query, visit[v] + 1), res_v);
} else { // a = v
res_u = bin_op(res_u, fold_query_rev(visit[v] + is_edge_query, visit[u] + 1));
}
return bin_op(res_u, res_v);
}
template <typename Q, constraints_t<is_range_update_query<Q>> = nullptr>
void update_path(int u, int v, Q update_query, bool is_edge_query = false) const {
for (;; v = par[head[v]]) {
if (visit[u] > visit[v]) std::swap(u, v);
if (head[u] == head[v]) break;
update_query(visit[head[v]], visit[v] + 1);
}
update_query(visit[u] + is_edge_query, visit[v] + 1);
}
template <typename T, typename Q, constraints_t<is_range_fold_query<Q, T>> = nullptr>
T fold_subtree(int u, Q fold_query, bool is_edge_query = false) const {
return fold_query(visit[u] + is_edge_query, leave[u]);
}
template <typename Q, constraints_t<is_range_update_query<Q>> = nullptr>
void update_subtree(int u, Q update_query, bool is_edge_query = false) const {
update_query(visit[u] + is_edge_query, leave[u]);
}
template <typename T, typename Q, constraints_t<is_point_get_query<Q, T>> = nullptr>
T get_point(int u, Q get_query) const {
return get_query(visit[u]);
}
template <typename Q, constraints_t<is_point_update_query<Q>> = nullptr>
void update_point(int u, Q update_query) const {
update_query(visit[u]);
}
std::vector<int> inv_ids() const {
std::vector<int> inv(n);
for (int i = 0; i < n; ++i) inv[visit[i]] = i;
return inv;
}
int get_visit_time(int u) const {
return visit[u];
}
int get_leave_time(int u) const {
return leave[u];
}
int get_head(int u) const {
return head[u];
}
int get_kth_visited(int k) const {
return ord[k];
}
int get_subtree_size(int u) const {
return siz[u];
}
int get_parent(int u) const {
return par[u];
}
int get_depth(int u) const {
return dep[u];
}
std::vector<int> get_roots() const {
std::vector<int> res;
for (int i = 0; i < n; ++i) if (par[i] < 0) res.push_back(i);
return res;
}
private:
int n;
std::vector<int> visit, leave, head, ord, siz, par, dep;
int dfs(Graph &g, int u, int p) {
par[u] = p;
siz[u] = 1;
int max_size = 0;
for (int &v : g[u]) {
if (v == p) continue;
dep[v] = dep[u] + 1;
siz[u] += dfs(g, v, u);
if (max_size < siz[v]) {
max_size = siz[v];
std::swap(g[u].front(), v);
}
}
return siz[u];
}
void hld(Graph &g, int u, int p, int &time) {
visit[u] = time, ord[time] = u, ++time;
head[u] = p >= 0 and g[p].front() == u ? head[p] : u;
for (int v : g[u]) {
if (v != p) hld(g, v, u, time);
}
leave[u] = time;
}
};
} // namespace suisen
#include <atcoder/dsu>
void solve() {
int n, L, R;
read(n, L, R);
vector<int> a(n);
read(a);
for (auto &e : a) --e;
FunctionalGraph g(a);
auto paths = g.infinite_paths();
atcoder::dsu uf(n);
vector<pair<int, int>> cs;
REP(i, n) {
int j = a[i];
if (uf.same(i, j)) {
cs.emplace_back(j, i);
} else {
uf.merge(i, j);
}
}
vector<int> pos(n, -1);
atcoder::dsu uf_cycle(n);
set<pair<int, int>> ce;
vector<int> cv;
for (auto [s, t] : cs) {
int id = 0;
for (int v = s;;) {
pos[v] = id++;
cv.push_back(v);
ce.emplace(v, a[v]);
uf_cycle.merge(v, a[v]);
v = a[v];
if (v == s) break;
}
}
atcoder::dsu uf2(n);
vector<vector<int>> t(n);
REP(i, n) {
int j = a[i];
if (ce.count({ i, j })) {
continue;
}
t[j].push_back(i);
uf2.merge(j, i);
}
vector<int> d(n);
HeavyLightDecomposition hld(t, cv);
for (int r : cv) {
auto dfs = [&](auto dfs, int u) -> void {
for (int v : t[u]) {
d[v] = d[u] + 1;
dfs(dfs, v);
}
};
dfs(dfs, r);
}
auto f = [&](int u, int v) -> pair<int, int> {
if (not uf2.same(u, v)) {
int x = paths[u].loop_v;
if (not uf_cycle.same(x, v)) return { -1, -1LL };
// u -> x
// x -> v
int a = d[u];
int px = pos[x];
int pv = pos[v];
int l = paths[x].loop_len;
if (px <= pv) {
a += pv - px;
} else {
a += pv - px + l;
}
return { a, l };
}
if (hld.dist(u, v) != d[u] - d[v]) {
return { -1, -1LL };
}
return { d[u] - d[v], iinf };
};
int q;
read(q);
LOOP(q) {
int s, t;
read(s, t);
--s, --t;
auto [a, b] = f(s, t);
if (a == -1) {
print(-1);
continue;
}
assert(a > 0 and b > 0);
if (b == iinf) {
// kL <= a <= kR
int k = a / L;
if (a <= 1LL * k * R) {
print(k);
} else {
print(-1);
}
continue;
}
// kL <= a+tb <= kR
if (L == R) {
// kL - tb = a
int g = gcd(L, b);
if (a % g) {
print(-1);
continue;
}
}
for (int k = a / L, r = a % b; ; ++k) {
if (1LL * k * (R - L) >= b) {
print(k);
break;
}
int fr = 1LL * k * L % b;
int to = 1LL * k * R % b;
if (fr <= to) {
if (fr <= r and r <= to) {
print(k);
break;
}
} else {
if (fr <= r or r <= to) {
print(k);
break;
}
}
}
}
}
int main() {
int test_case_num = 1;
// read(test_case_num);
LOOP(test_case_num) solve();
return 0;
}