結果
問題 | No.1957 Xor Min |
ユーザー |
|
提出日時 | 2022-05-27 21:59:29 |
言語 | C++23 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 2 ms / 2,000 ms |
コード長 | 8,735 bytes |
コンパイル時間 | 2,476 ms |
コンパイル使用メモリ | 245,276 KB |
実行使用メモリ | 5,376 KB |
最終ジャッジ日時 | 2024-09-20 15:52:34 |
合計ジャッジ時間 | 3,563 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 25 |
ソースコード
#include <bits/stdc++.h>#ifndef CONSTANTS_H_#define CONSTANTS_H_// big = 2305843009213693951 = 2^61-1 ~= 2.3*10^18const int64_t big = std::numeric_limits<int64_t>::max() / 4;#endif // CONSTANTS_H_#ifndef DEBUG_H_#define DEBUG_H_#ifndef TYPE_TRAITS_H_#define TYPE_TRAITS_H_template <typename T, typename = void>struct is_dereferenceable : std::false_type {};template <typename T>struct is_dereferenceable<T, std::void_t<decltype(*std::declval<T>())>>: std::true_type {};template <typename T, typename = void>struct is_iterable : std::false_type {};template <typename T>struct is_iterable<T, std::void_t<decltype(std::begin(std::declval<T>())),decltype(std::end(std::declval<T>()))>>: std::true_type {};template <typename T, typename = void>struct is_applicable : std::false_type {};template <typename T>struct is_applicable<T, std::void_t<decltype(std::tuple_size<T>::value)>>: std::true_type {};#endif // TYPE_TRAITS_Htemplate <typename T, typename... Ts>void debug(std::ostream& os, const T& value, const Ts&... args);template <typename T>void debug(std::ostream& os, const T& v) {if constexpr (std::is_same<int64_t, std::decay_t<T>>::value) {if (v == big) {os << "big";} else {os << v;}} else if constexpr (std::is_same<char*, std::decay_t<T>>::value ||std::is_same<std::string, T>::value) {os << v;} else if constexpr (is_dereferenceable<T>::value) {os << "{";if (v) {debug(os, *v);} else {os << "nil";}os << "}";} else if constexpr (is_iterable<T>::value) {os << "{";for (auto it = std::begin(v); it != std::end(v); ++it) {if (it != std::begin(v)) os << ", ";debug(os, *it);}os << "}";} else if constexpr (is_applicable<T>::value) {os << "{";std::apply([&os](const auto&... args) { debug(os, args...); }, v);os << "}";} else {os << v;}}template <typename T, typename... Ts>void debug(std::ostream& os, const T& value, const Ts&... args) {debug(os, value);os << ", ";debug(os, args...);}#if DEBUG#define dbg(...) \do { \std::cerr << #__VA_ARGS__ << ": "; \debug(std::cerr, __VA_ARGS__); \std::cerr << " (L" << __LINE__ << ")\n"; \} while (0)#else#define dbg(...)#endif#endif // DEBUG_H_#ifndef FIX_H_#define FIX_H_template <class F>struct FixPoint {F f;template <class... Args>decltype(auto) operator()(Args&&... args) const {return f(std::ref(*this), std::forward<Args>(args)...);}};template <class F>FixPoint<std::decay_t<F>> Fix(F&& f) {return {std::forward<F>(f)};}#endif // FIX_H_#ifndef IO_H_#define IO_Hvoid read_from_cin() {}template <typename T, typename... Ts>void read_from_cin(T& value, Ts&... args) {std::cin >> value;read_from_cin(args...);}#define rd(type, ...) \type __VA_ARGS__; \read_from_cin(__VA_ARGS__);#define ints(...) rd(int, __VA_ARGS__);#define strings(...) rd(string, __VA_ARGS__);const char *yes_str = "Yes", *no_str = "No";template <typename T>void write_to_cout(const T& value) {if constexpr (std::is_same<T, bool>::value) {std::cout << (value ? yes_str : no_str);} else if constexpr (is_iterable<T>::value &&!std::is_same<T, std::string>::value) {for (auto it = std::begin(value); it != std::end(value); ++it) {if (it != std::begin(value)) std::cout << " ";std::cout << *it;}} else {std::cout << value;}}template <typename T, typename... Ts>void write_to_cout(const T& value, const Ts&... args) {write_to_cout(value);std::cout << ' ';write_to_cout(args...);}#define wt(...) \do { \write_to_cout(__VA_ARGS__); \cout << '\n'; \} while (0)template <typename T>std::istream& operator>>(std::istream& is, std::vector<T>& v) {for (T& vi : v) is >> vi;return is;}template <typename T, typename U>std::istream& operator>>(std::istream& is, std::pair<T, U>& p) {is >> p.first >> p.second;return is;}#endif // IO_H_#ifndef MACROS_H_#define MACROS_H_#define all(x) (x).begin(), (x).end()#define eb(...) emplace_back(__VA_ARGS__)#define pb(...) push_back(__VA_ARGS__)#define dispatch(_1, _2, _3, name, ...) name#define as_i64(x) \( \[] { \static_assert( \std::is_integral< \typename std::remove_reference<decltype(x)>::type>::value, \"rep macro supports std integral types only"); \}, \static_cast<int64_t>(x))#define rep3(i, a, b) for (int64_t i = as_i64(a); i < as_i64(b); ++i)#define rep2(i, n) rep3(i, 0, n)#define rep1(n) rep2(_loop_variable_, n)#define rep(...) dispatch(__VA_ARGS__, rep3, rep2, rep1)(__VA_ARGS__)#define rrep3(i, a, b) for (int64_t i = as_i64(b) - 1; i >= as_i64(a); --i)#define rrep2(i, n) rrep3(i, 0, n)#define rrep1(n) rrep2(_loop_variable_, n)#define rrep(...) dispatch(__VA_ARGS__, rrep3, rrep2, rrep1)(__VA_ARGS__)#define each3(k, v, c) for (auto&& [k, v] : c)#define each2(e, c) for (auto&& e : c)#define each(...) dispatch(__VA_ARGS__, each3, each2)(__VA_ARGS__)template <typename T, typename U>bool chmax(T& a, U b) {if (a < b) {a = b;return true;}return false;}template <typename T, typename U>bool chmin(T& a, U b) {if (a > b) {a = b;return true;}return false;}template <typename T, typename U>auto max(T a, U b) {return a > b ? a : b;}template <typename T, typename U>auto min(T a, U b) {return a < b ? a : b;}template <typename T>auto max(const T& v) {return *std::max_element(v.begin(), v.end());}template <typename T>auto min(const T& v) {return *std::min_element(v.begin(), v.end());}template <typename T>int64_t sz(const T& v) {return std::size(v);}template <typename T>int64_t popcount(T i) {return std::bitset<std::numeric_limits<T>::digits>(i).count();}template <typename T>bool hasbit(T s, int i) {return std::bitset<std::numeric_limits<T>::digits>(s)[i];}template <typename T, typename U>auto div_floor(T n, U d) {if (d < 0) {n = -n;d = -d;}if (n < 0) {return -((-n + d - 1) / d);}return n / d;};template <typename T, typename U>auto div_ceil(T n, U d) {if (d < 0) {n = -n;d = -d;}if (n < 0) {return -(-n / d);}return (n + d - 1) / d;}template <typename T>bool even(T x) {return x % 2 == 0;}std::array<std::pair<int64_t, int64_t>, 4> adjacent(int64_t i, int64_t j) {return {{{i + 1, j}, {i, j + 1}, {i - 1, j}, {i, j - 1}}};}bool inside(int64_t i, int64_t j, int64_t I, int64_t J) {return 0 <= i && i < I && 0 <= j && j < J;}template <typename T>void sort(T& v) {return std::sort(v.begin(), v.end());}template <typename T, typename Compare>void sort(T& v, Compare comp) {return std::sort(v.begin(), v.end(), comp);}template <typename T>void reverse(T& v) {return std::reverse(v.begin(), v.end());}template <typename T>typename T::value_type accumulate(const T& v) {return std::accumulate(v.begin(), v.end(), typename T::value_type());}using i64 = int64_t;using i32 = int32_t;template <typename T>using low_priority_queue =std::priority_queue<T, std::vector<T>, std::greater<T>>;template <typename T>using V = std::vector<T>;template <typename T>using VV = V<V<T>>;#endif // MACROS_H_void Main();int main() {std::ios_base::sync_with_stdio(false);std::cin.tie(NULL);std::cout << std::fixed << std::setprecision(20);Main();return 0;}using namespace std;#define int i64int hb(int x) { return 63 - __builtin_clzll(x); }int naive(int a, int b) {int ans = -big;rep(x, a + 1) rep(y, b + 1) {int z = min({x, y, (x ^ y)});// dbg(x, y, (x ^ y), z);chmax(ans, z);}return ans;}int solve(int a, int b) {if (a > b) swap(a, b);if (b == 0) return 0;if (hb(a) == hb(b)) {return (1LL << hb(a)) - 1;}return a;}void Main() {ints(a, b);wt(solve(a, b));/*rep(a, 100) rep(b, 100) {int x = naive(a, b);int y = solve(a, b);if (x != y) dbg(a, b, x, y);}*/}