結果

問題 No.550 夏休みの思い出（１）
ユーザー snrnsidy
提出日時 2021-07-15 21:13:43
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 1,266 bytes
コンパイル時間 1,933 ms
コンパイル使用メモリ 192,988 KB
最終ジャッジ日時 2025-01-23 01:08:46
ジャッジサーバーID
（参考情報） 		judge3 / judge4
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ファイルパターン 結果
sample AC * 3
other AC * 26 WA * 29
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/istream:41,
                 from /usr/include/c++/13/sstream:40,
                 from /usr/include/c++/13/complex:45,
                 from /usr/include/c++/13/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/13/bits/stdc++.h:127,
                 from main.cpp:1:
In member function ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>]’,
    inlined from ‘int main()’ at main.cpp:66:18:
/usr/include/c++/13/ostream:235:25: warning: ‘res[0]’ may be used uninitialized [-Wmaybe-uninitialized]
  235 |       { return _M_insert(__f); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function ‘int main()’:
main.cpp:17:17: note: ‘res[0]’ was declared here
   17 |     long double res[3];
      |                 ^~~
In member function ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>]’,
    inlined from ‘int main()’ at main.cpp:66:35:
/usr/include/c++/13/ostream:235:25: warning: ‘res[1]’ may be used uninitialized [-Wmaybe-uninitialized]
  235 |       { return _M_insert(__f); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function ‘int main()’:
main.cpp:17:17: note: ‘res[1]’ was declared here
   17 |     long double res[3];
      |                 ^~~
In member function ‘std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>]’,
    inlined from ‘int main()’ at main.cpp:66:52:
/usr/include/c++/13/ostream:235:25: warning: ‘res[2]’ may be used uninitialized [-Wmaybe-uninitialized]
  235 |       { return _M_insert(__f); }
      |                ~~~~~~~~~^~~~~
main.cpp: In function ‘int main()’:
main.cpp:17:17: note

ソースコード

diff # 

#include <bits/stdc++.h>

using namespace std;

long long int A, B, C;
long double f(long double x)
{
    return x * x * x + A * x * x + B * x + C;
}

int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
   
    cin >> A >> B >> C;
    long double res[3];
    long double p0 = (-A - sqrt(A * A - 3 * B)) / 3;
    long double p1 = (-A + sqrt(A * A - 3 * B)) / 3;
    long double lo = -1e9;
    long double hi = p0;
    for(int i=0;i<200;i++)
    {
        long double mid = (lo + hi) / 2;
        if (f(mid) <= 0)
        {
            res[0] = mid;
            lo = mid + 1;
        }
        else
        {
            hi = mid - 1;
        }
    }
    lo = p0;
    hi = p1;
    for(int i=0;i<200;i++)
    {
        long double mid = (lo + hi) / 2;
        if (f(mid) >= 0)
        {
            res[1] = mid;
            lo = mid + 1;
        }
        else
        {
            hi = mid - 1;
        }
    }
    lo = p1;
    hi = 1e9;
    for(int i=0;i<200;i++)
    {
        long double mid = (lo + hi) / 2;
        if (f(mid) <= 0)
        {
            res[2] = mid;
            lo = mid + 1;
        }
        else
        {
            hi = mid - 1;
        }
    }

    cout << res[0] << ' ' << res[1] << ' ' << res[2] << '\n';
    return 0;
}
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