結果

問題 No.281 門松と魔法(1)
ユーザー not_522not_522
提出日時 2020-01-02 23:52:58
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 3 ms / 1,000 ms
コード長 4,999 bytes
コンパイル時間 1,058 ms
コンパイル使用メモリ 98,996 KB
最終ジャッジ日時 2025-01-08 15:55:15
ジャッジサーバーID
（参考情報） 		judge4 / judge4
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ファイルパターン 結果
other AC * 57
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ソースコード

diff # 

// This is free and unencumbered software released into the public domain.

// Anyone is free to copy, modify, publish, use, compile, sell, or
// distribute this software, either in source code form or as a compiled
// binary, for any purpose, commercial or non-commercial, and by any
// means.

// In jurisdictions that recognize copyright laws, the author or authors
// of this software dedicate any and all copyright interest in the
// software to the public domain. We make this dedication for the benefit
// of the public at large and to the detriment of our heirs and
// successors. We intend this dedication to be an overt act of
// relinquishment in perpetuity of all present and future rights to this
// software under copyright law.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
// OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.

// For more information, please refer to <http://unlicense.org>

/****************/
/* template.hpp */
/****************/

#include <algorithm>
#include <cassert>
#include <functional>
#include <iomanip>
#include <iostream>
#include <limits>

using std::cerr;
using std::cout;
using std::endl;
using std::max;
using std::min;
using std::swap;

struct BoolName : std::numpunct<char> {
  std::string t, f;
  BoolName(std::string t, std::string f) : t(t), f(f) {}
  std::string do_truename() const { return t; }
  std::string do_falsename() const { return f; }
};

void setBoolName(std::string t, std::string f) {
  cout.imbue(std::locale(cout.getloc(), new BoolName(t, f)));
}

struct Initializer {
  Initializer() {
    cout << std::fixed << std::setprecision(15) << std::boolalpha;
    setBoolName("Yes", "No");
  }
} initializer;

struct Input {
  bool eof;

  Input() : eof(false) {}

  operator char() {
    char v;
    this->eof = (std::scanf("%c", &v) != 1);
    return v;
  }

  operator int() {
    int v;
    this->eof = (std::scanf("%d", &v) != 1);
    return v;
  }

  operator long() {
    long v;
    this->eof = (std::scanf("%ld", &v) != 1);
    return v;
  }

  operator long long() {
    long long v;
    this->eof = (std::scanf("%lld", &v) != 1);
    return v;
  }

  operator unsigned int() {
    unsigned int v;
    this->eof = (std::scanf("%u", &v) != 1);
    return v;
  }

  operator unsigned long() {
    unsigned long v;
    this->eof = (std::scanf("%lu", &v) != 1);
    return v;
  }

  operator unsigned long long() {
    unsigned long long v;
    this->eof = (std::scanf("%llu", &v) != 1);
    return v;
  }

  operator double() {
    double v;
    this->eof = (std::scanf("%lf", &v) != 1);
    return v;
  }

  operator long double() {
    long double v;
    this->eof = (std::scanf("%Lf", &v) != 1);
    return v;
  }

  void ignore() const { getchar(); }
} in;

template <typename T> T abs(T a) { return a >= 0 ? a : -a; }

template <typename T, typename S> bool chmin(T &a, const S &b) {
  return a > b ? a = b, true : false;
}

template <typename T, typename S> bool chmax(T &a, const S &b) {
  return a < b ? a = b, true : false;
}

template <typename T, typename S> std::function<S(T)> cast() {
  return [](const T &t) { return static_cast<S>(t); };
}

template <typename T> T copy(const T &a) { return T(a); }

class ZeroPadding {
public:
  ZeroPadding(int n) : n(n) {}

  int n;
};

std::ostream &operator<<(std::ostream &os, const ZeroPadding &z) {
  os << std::setw(z.n) << std::setfill('0');
  return os;
}

template <typename T> constexpr T inf() {
  return std::numeric_limits<T>::max() / 2 - 1;
}

/************/
/* main.cpp */
/************/

int d;

void magic(int &n, int &res, int t = 1) {
  n -= d * t;
  if (n < 0) {
    n = 0;
  }
  res += t;
}

bool isKadomatsu(int h1, int h2, int h3) {
  return h1 != h2 && h1 != h3 && h2 != h3 &&
         ((h2 > h1 && h2 > h3) || (h2 < h1 && h2 < h3));
}

int solve1(int h1, int h2, int h3) {
  if (h2 == 0) {
    return inf<int>();
  }
  int res = 0;
  if (h1 >= h2) {
    magic(h1, res, (h1 - h2) / d + 1);
  }
  if (h3 >= h2) {
    magic(h3, res, (h3 - h2) / d + 1);
  }
  if (h1 == h3) {
    magic(h1, res);
  }
  if (h1 == h3) {
    return inf<int>();
  }
  return res;
}

int solve2(int h1, int h2, int h3) {
  int res = 0;
  if (h1 == h3) {
    magic(h1, res);
  }
  if (h1 == 0 || h3 == 0) {
    return inf<int>();
  }
  if (min(h1, h3) <= h2) {
    magic(h2, res, (h2 - min(h1, h3)) / d + 1);
  }
  return res;
}

int main() {
  d = in;
  int h1(in), h2(in), h3(in);
  if (isKadomatsu(h1, h2, h3)) {
    cout << 0 << endl;
  } else if (d == 0) {
    cout << -1 << endl;
  } else {
    int res = min(solve1(h1, h2, h3), solve2(h1, h2, h3));
    cout << (res == inf<int>() ? -1 : res) << endl;
  }
}
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