結果

問題 No.2382 Amidakuji M
コンテスト
ユーザー a01sa01to
提出日時 2023-07-14 21:39:06
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 121 ms / 2,000 ms
コード長 1,482 bytes
コンパイル時間 1,613 ms
コンパイル使用メモリ 200,076 KB
最終ジャッジ日時 2025-02-15 13:47:10
ジャッジサーバーID
（参考情報） 		judge3 / judge4
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3
other AC * 19
権限があれば一括ダウンロードができます
コンパイルメッセージ
In file included from /usr/include/c++/13/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:51,
                 from main.cpp:1:
In static member function ‘static _Up* std::__copy_move<_IsMove, true, std::random_access_iterator_tag>::__copy_m(_Tp*, _Tp*, _Up*) [with _Tp = const int; _Up = int; bool _IsMove = false]’,
    inlined from ‘_OI std::__copy_move_a2(_II, _II, _OI) [with bool _IsMove = false; _II = const int*; _OI = int*]’ at /usr/include/c++/13/bits/stl_algobase.h:506:30,
    inlined from ‘_OI std::__copy_move_a1(_II, _II, _OI) [with bool _IsMove = false; _II = const int*; _OI = int*]’ at /usr/include/c++/13/bits/stl_algobase.h:533:42,
    inlined from ‘_OI std::__copy_move_a(_II, _II, _OI) [with bool _IsMove = false; _II = __gnu_cxx::__normal_iterator<const int*, vector<int> >; _OI = int*]’ at /usr/include/c++/13/bits/stl_algobase.h:540:31,
    inlined from ‘_OI std::copy(_II, _II, _OI) [with _II = __gnu_cxx::__normal_iterator<const int*, vector<int> >; _OI = int*]’ at /usr/include/c++/13/bits/stl_algobase.h:633:7,
    inlined from ‘static _ForwardIterator std::__uninitialized_copy<true>::__uninit_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const int*, std::vector<int> >; _ForwardIterator = int*]’ at /usr/include/c++/13/bits/stl_uninitialized.h:147:27,
    inlined from ‘_ForwardIterator std::uninitialized_copy(_InputIterator, _InputIterator, _ForwardIterator) [with _InputIterator = __gnu_cxx::__normal_iterator<const int*, vector<int> >; _ForwardIterator = int*]’ at /usr/include/c++/13/bits/stl_uninitialized.h:185:15,
    inlined from ‘_ForwardIterator std::__uninitialized_copy_a(_InputIterator, _InputIterator, _ForwardIterator, allocator<_Tp>&) [with _InputIterator = __gnu_cxx::__normal_iterator<const int*, vector<int> >; _ForwardIterator = int*; _Tp = int]’ at /usr/include/c++/13/bits/stl_uninitialized.h:373:37,
    inlined

ソースコード

diff # 

#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
using ll = long long;
#define rep(i, n) for (int i = 0; i < (n); ++i)

// Usage: T = 転倒数の型、U = 要素の型
template<typename T, typename U>
pair<T, vector<U>> invNum(vector<U> a) {
  size_t n = a.size();
  if (n <= 1) return { (T) 0, a };
  size_t mid = n / 2;
  auto left = invNum<T, U>(vector<U>(a.begin(), a.begin() + mid));
  auto right = invNum<T, U>(vector<U>(a.begin() + mid, a.end()));
  vector<U> res;
  T inv = 0;
  inv += left.first + right.first;
  size_t i = 0, j = 0;
  while (i < left.second.size() && j < right.second.size()) {
    if (left.second[i] <= right.second[j]) {
      res.push_back(left.second[i]);
      i++;
    }
    else {
      res.push_back(right.second[j]);
      j++;
      inv += left.second.size() - i;
    }
  }
  while (i < left.second.size()) {
    res.push_back(left.second[i]);
    i++;
  }
  while (j < right.second.size()) {
    res.push_back(right.second[j]);
    j++;
  }
  return { inv, res };
}

int main() {
  int n;
  ll m;
  cin >> n >> m;
  vector<int> p(n);
  rep(i, n) cin >> p[i];
  auto [inv, q] = invNum<ll, int>(p);
  Debug(inv);
  ll minim = (inv + m - 1) / m * m;
  if (minim % 2 == inv % 2) {
    cout << minim << endl;
  }
  else if ((minim + m) % 2 == inv % 2) {
    cout << minim + m << endl;
  }
  else {
    cout << -1 << endl;
  }
  return 0;
}
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