結果
| 問題 | No.1509 Swap!! |
| コンテスト | |
| ユーザー |
keijak
|
| 提出日時 | 2021-05-14 23:28:17 |
| 言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
WA
|
| 実行時間 | - |
| コード長 | 3,209 bytes |
| コンパイル時間 | 3,068 ms |
| コンパイル使用メモリ | 194,516 KB |
| 最終ジャッジ日時 | 2025-01-21 12:21:36 |
|
ジャッジサーバーID (参考情報) |
judge1 / judge1 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 1 |
| other | AC * 3 WA * 27 |
ソースコード
#include <bits/stdc++.h>
#include <optional>
#define REP_(i, a_, b_, a, b, ...) \
for (int i = (a), END_##i = (b); i < END_##i; ++i)
#define REP(i, ...) REP_(i, __VA_ARGS__, __VA_ARGS__, 0, __VA_ARGS__)
#define ALL(x) std::begin(x), std::end(x)
using i64 = long long;
template <typename T, typename U>
inline bool chmax(T &a, U b) {
return a < b and ((a = std::move(b)), true);
}
template <typename T, typename U>
inline bool chmin(T &a, U b) {
return a > b and ((a = std::move(b)), true);
}
template <typename T>
inline int ssize(const T &a) {
return (int)std::size(a);
}
template <typename T>
std::istream &operator>>(std::istream &is, std::vector<T> &a) {
for (auto &x : a) is >> x;
return is;
}
template <typename T, typename U>
std::ostream &operator<<(std::ostream &os, const std::pair<T, U> &a) {
return os << "(" << a.first << ", " << a.second << ")";
}
template <typename Container>
std::ostream &print_seq(const Container &a, std::string_view sep = " ",
std::string_view ends = "\n",
std::ostream &os = std::cout) {
auto b = std::begin(a), e = std::end(a);
for (auto it = std::begin(a); it != e; ++it) {
if (it != b) os << sep;
os << *it;
}
return os << ends;
}
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 = std::enable_if_t<
is_iterable<T>::value &&
!std::is_same<T, std::string_view>::value &&
!std::is_same<T, std::string>::value>>
std::ostream &operator<<(std::ostream &os, const T &a) {
return print_seq(a, ", ", "", (os << "{")) << "}";
}
#ifdef ENABLE_DEBUG
#include "debug_dump.hpp"
#else
#define DUMP(...)
#endif
using namespace std;
template <class T>
T floor_div(T x, T y) {
assert(y != 0);
if (y < 0) x = -x, y = -y;
return (x >= 0) ? (x / y) : ((x - y + 1) / y);
}
// Etended Euclidean algorithm.
// Returns [g, x, y] where g = a*x + b*y = GCD(a, b).
// Note that g, x, y can be negative.
std::array<i64, 3> ext_gcd(i64 a, i64 b) {
if (b == 0) return {a, 1LL, 0LL};
auto res = ext_gcd(b, a % b); // = (g, x, y)
res[1] -= (a / b) * res[2];
std::swap(res[1], res[2]);
return res; // = (g, y, x - (a/b)*y)
}
std::optional<std::array<i64, 2>> linear_diophantine(i64 a, i64 b, i64 c) {
auto [g, x, y] = ext_gcd(a, b);
if (g < 0) {
g *= -1, x *= -1, y *= -1;
}
if (c % g != 0) return std::nullopt;
a /= g, b /= g, c /= g;
x *= c, y *= c;
auto m = floor_div(x, b);
x -= m * b;
y += m * a;
assert(0 <= x and x < b);
return std::array{x, y};
}
auto solve() {
i64 n, a, b;
cin >> n >> a >> b;
if (gcd(a, b) != 1) return false;
if (a < b) swap(a, b);
auto res = linear_diophantine(a, b, 1);
if (!res) return false;
auto [p, q] = *res;
return n >= 1 + p * a;
}
int main() {
ios_base::sync_with_stdio(false), cin.tie(nullptr);
int t;
cin >> t;
REP(i, t) cout << (solve() ? "YES" : "NO") << "\n";
}
keijak