結果

問題 No.2382 Amidakuji M
ユーザー ecottea
提出日時 2023-07-14 21:56:26
言語 C++17(gcc12)
(gcc 12.3.0 + boost 1.87.0)
結果
CE  
(最新)
AC  
(最初)
実行時間 -
コード長 8,850 bytes
コンパイル時間 8,123 ms
コンパイル使用メモリ 276,124 KB
最終ジャッジ日時 2025-02-15 14:01:16
ジャッジサーバーID
(参考情報)
judge4 / judge1
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コンパイルエラー時のメッセージ・ソースコードは、提出者また管理者しか表示できないようにしております。(リジャッジ後のコンパイルエラーは公開されます)
ただし、clay言語の場合は開発者のデバッグのため、公開されます。

コンパイルメッセージ
main.cpp: In function '__int128 bezout(__int128, __int128, __int128, __int128&, __int128&)':
main.cpp:239:24: error: call of overloaded 'abs(__int128)' is ambiguous
  239 |         x = smod(x, abs(b / g));
      |                     ~~~^~~~~~~
main.cpp:45:30: note: in definition of macro 'smod'
   45 | #define smod(n, m) ((((n) % (m)) + (m)) % (m)) // 非負mod
      |                              ^
In file included from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:38,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/cmath:47,
                 from /home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/x86_64-pc-linux-gnu/bits/stdc++.h:41,
                 from main.cpp:7:
/usr/include/stdlib.h:980:12: note: candidate: 'int abs(int)'
  980 | extern int abs (int __x) __THROW __attribute__ ((__const__)) __wur;
      |            ^~~
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:79:3: note: candidate: 'constexpr long double std::abs(long double)'
   79 |   abs(long double __x)
      |   ^~~
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:75:3: note: candidate: 'constexpr float std::abs(float)'
   75 |   abs(float __x)
      |   ^~~
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:71:3: note: candidate: 'constexpr double std::abs(double)'
   71 |   abs(double __x)
      |   ^~~
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:61:3: note: candidate: 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
/home/linuxbrew/.linuxbrew/Cellar/gcc@12/12.4.0/include/c++/12/bits/std_abs.h:56:3: note: candidate: 'long int std::abs(long int)'
   56 |   abs(long __i) { return __builtin_labs(__i); }
      |   ^~~
main.cpp:239:24: error: call of overloaded 'abs(__int128)' is ambiguous
  239 |         x = smod(x, abs(b / g));
    

ソースコード

diff #
プレゼンテーションモードにする

#ifndef HIDDEN_IN_VS //
//
#define _CRT_SECURE_NO_WARNINGS
//
#include <bits/stdc++.h>
using namespace std;
//
using ll = long long; // -2^63 2^63 = 9 * 10^18int -2^31 2^31 = 2 * 10^9
using pii = pair<int, int>; using pll = pair<ll, ll>; using pil = pair<int, ll>; using pli = pair<ll, int>;
using vi = vector<int>; using vvi = vector<vi>; using vvvi = vector<vvi>; using vvvvi = vector<vvvi>;
using vl = vector<ll>; using vvl = vector<vl>; using vvvl = vector<vvl>; using vvvvl = vector<vvvl>;
using vb = vector<bool>; using vvb = vector<vb>; using vvvb = vector<vvb>;
using vc = vector<char>; using vvc = vector<vc>; using vvvc = vector<vvc>;
using vd = vector<double>; using vvd = vector<vd>; using vvvd = vector<vvd>;
template <class T> using priority_queue_rev = priority_queue<T, vector<T>, greater<T>>;
using Graph = vvi;
//
const double PI = acos(-1);
const vi DX = { 1, 0, -1, 0 }; // 4
const vi DY = { 0, 1, 0, -1 };
int INF = 1001001001; ll INFL = 4004004003104004004LL; // (int)INFL = 1010931620;
double EPS = 1e-15;
//
struct fast_io { fast_io() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(18); } } fastIOtmp;
//
#define all(a) (a).begin(), (a).end()
#define sz(x) ((int)(x).size())
#define lbpos(a, x) (int)distance((a).begin(), std::lower_bound(all(a), x))
#define ubpos(a, x) (int)distance((a).begin(), std::upper_bound(all(a), x))
#define Yes(b) {cout << ((b) ? "Yes\n" : "No\n");}
#define YES(b) {cout << ((b) ? "YES\n" : "NO\n");}
#define rep(i, n) for(int i = 0, i##_len = int(n); i < i##_len; ++i) // 0 n-1
#define repi(i, s, t) for(int i = int(s), i##_end = int(t); i <= i##_end; ++i) // s t
#define repir(i, s, t) for(int i = int(s), i##_end = int(t); i >= i##_end; --i) // s t
#define repe(v, a) for(const auto& v : (a)) // a
#define repea(v, a) for(auto& v : (a)) // a
#define repb(set, d) for(int set = 0; set < (1 << int(d)); ++set) // d
#define repp(a) sort(all(a)); for(bool a##_perm = true; a##_perm; a##_perm = next_permutation(all(a))) // a
#define smod(n, m) ((((n) % (m)) + (m)) % (m)) // mod
#define uniq(a) {sort(all(a)); (a).erase(unique(all(a)), (a).end());} //
#define EXIT(a) {cout << (a) << endl; exit(0);} //
#define inQ(x, y, u, l, d, r) ((u) <= (x) && (l) <= (y) && (x) < (d) && (y) < (r)) //
//
template <class T> inline ll pow(T n, int k) { ll v = 1; rep(i, k) v *= n; return v; }
template <class T> inline bool chmax(T& M, const T& x) { if (M < x) { M = x; return true; } return false; } // true
    
template <class T> inline bool chmin(T& m, const T& x) { if (m > x) { m = x; return true; } return false; } // true
    
template <class T> inline T get(T set, int i) { return (set >> i) & T(1); }
//
template <class T, class U> inline istream& operator>>(istream& is, pair<T, U>& p) { is >> p.first >> p.second; return is; }
template <class T> inline istream& operator>>(istream& is, vector<T>& v) { repea(x, v) is >> x; return is; }
template <class T> inline vector<T>& operator--(vector<T>& v) { repea(x, v) --x; return v; }
template <class T> inline vector<T>& operator++(vector<T>& v) { repea(x, v) ++x; return v; }
#endif //
#if __has_include(<atcoder/all>)
#include <atcoder/all>
using namespace atcoder;
#ifdef _MSC_VER
#include "localACL.hpp"
#endif
//using mint = modint1000000007;
using mint = modint998244353;
//using mint = modint; // mint::set_mod(m);
namespace atcoder {
inline istream& operator>>(istream& is, mint& x) { ll x_; is >> x_; x = x_; return is; }
inline ostream& operator<<(ostream& os, const mint& x) { os << x.val(); return os; }
}
using vm = vector<mint>; using vvm = vector<vm>; using vvvm = vector<vvm>; using vvvvm = vector<vvvm>;
#endif
#ifdef _MSC_VER // Visual Studio
#include "local.hpp"
#else // gcc
inline int popcount(int n) { return __builtin_popcount(n); }
inline int popcount(ll n) { return __builtin_popcountll(n); }
inline int lsb(int n) { return n != 0 ? __builtin_ctz(n) : -1; }
inline int lsb(ll n) { return n != 0 ? __builtin_ctzll(n) : -1; }
inline int msb(int n) { return n != 0 ? (31 - __builtin_clz(n)) : -1; }
inline int msb(ll n) { return n != 0 ? (63 - __builtin_clzll(n)) : -1; }
#define gcd __gcd
#define dump(...)
#define dumpel(v)
#define dump_list(v)
#define dump_mat(v)
#define input_from_file(f)
#define output_to_file(f)
#define Assert(b) { if (!(b)) while (1) cout << "OLE"; }
#endif
//O(n log n)
/*
* a[0..n)
*/
template <class T>
ll inversion_number(const vector<T>& a) {
// verify : https://atcoder.jp/contests/arc075/tasks/arc075_c
int n = sz(a);
// a[i] i
vector<pair<T, int>> ai(n);
rep(i, n) ai[i] = { a[i], i };
sort(all(ai));
ll res = 0;
// ft[i] : i
fenwick_tree<int> ft(n);
//
rep(j, n) {
// pos : j
int pos = ai[j].second;
// pos j
res += ft.sum(pos + 1, n);
// pos
ft.add(pos, 1);
}
return res;
}
//O(1)
/*
* x x y y ≡ k (mod m)
*/
template <class T>
T ceil_mod(T x, T m, T k) {
// verify : https://yukicoder.me/problems/9033
//
// k = 0
// y = x + (-x mod m)
// k k
// y - k = (x - k) + (-(x - k) mod m)
//
Assert(m > 0);
k = smod(k, m);
x -= k;
T y = x + smod(-x, m);
return y + k;
}
#ifdef _MSC_VER
#define __int128 ll //
#endif
//O(log max(|a|, |b|))
/*
* g = gcd(a, b) > 0 a x + b y = g (x, y)
* |x| + |y|
*/
__int128 extended_gcd(__int128 a, __int128 b, __int128& x, __int128& y) {
// https://qiita.com/drken/items/b97ff231e43bce50199a
// verify : https://onlinejudge.u-aizu.ac.jp/courses/library/6/NTL/all/NTL_1_E
//
// b = 0 g = a (x, y) = (1, 0)
//
// b != 0 a b
// a = q b + r (0 <= r < b)
// q, r
// (q b + r) x + b y = g
// ⇔ b (q x + y) + r x = g
//
// b X + r Y = g
// (X, Y) = (q x + y, x)
// (x, y) = (Y, X - q Y)
//
// b = 0
if (b == 0) {
//
x = (a > 0) ? 1 : -1;
y = 0;
return a * x;
}
// a b q r
__int128 q = a / b, r = a % b;
// a, b X, Y
__int128 X, Y;
__int128 d = extended_gcd(b, r, X, Y);
// X, Y x, y
x = Y;
y = X - q * Y;
return d;
}
//O(log max(|a|, |b|))
/*
* a x + b y = c (x, y)
* gcd(a, b) > 0 -1
*
*
*/
__int128 bezout(__int128 a, __int128 b, __int128 c, __int128& x, __int128& y) {
// verify : https://atcoder.jp/contests/arc091/tasks/arc091_d
__int128 g = extended_gcd(a, b, x, y);
if (c % g != 0) return -1;
x *= c / g;
y *= c / g;
dump(x, y, g);
// x x = smod(x, b / g); y = (n - a * x) / b;
// y y = smod(y, a / g); x = (n - b * y) / a;
// verify : https://atcoder.jp/contests/arc091/tasks/arc091_d
x = smod(x, abs(b / g));
return g;
}
int main() {
// input_from_file("input.txt");
// output_to_file("output.txt");
int n; ll m;
cin >> n >> m;
vi p(n);
cin >> p;
--p;
ll inv = inversion_number(p);
dump(inv);
__int128 x, y;
__int128 g = bezout(2, -m, -inv, x, y);
if (g == -1) EXIT(-1);
cout << (ll)(inv + 2 * x) << endl;
}
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