結果

問題 No.955 ax^2+bx+c=0
ユーザー 👑 hitonanodehitonanode
提出日時 2020-09-21 18:35:44
言語 C++17
(gcc 13.2.0 + boost 1.83.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 4,663 bytes
コンパイル時間 2,036 ms
コンパイル使用メモリ 202,044 KB
実行使用メモリ 4,384 KB
最終ジャッジ日時 2023-09-06 17:25:20
合計ジャッジ時間 5,591 ms
ジャッジサーバーID
（参考情報） 		judge15 / judge14
このコードへのチャレンジ
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テストケース

テストケース表示
入力 結果 実行時間
実行使用メモリ
testcase_00 AC 2 ms
4,376 KB
testcase_01 AC 1 ms
4,380 KB
testcase_02 AC 1 ms
4,380 KB
testcase_03 AC 1 ms
4,380 KB
testcase_04 AC 2 ms
4,380 KB
testcase_05 AC 1 ms
4,380 KB
testcase_06 AC 1 ms
4,380 KB
testcase_07 AC 2 ms
4,380 KB
testcase_08 AC 1 ms
4,380 KB
testcase_09 AC 2 ms
4,376 KB
testcase_10 AC 2 ms
4,380 KB
testcase_11 AC 1 ms
4,380 KB
testcase_12 AC 1 ms
4,376 KB
testcase_13 AC 1 ms
4,376 KB
testcase_14 AC 1 ms
4,380 KB
testcase_15 AC 1 ms
4,376 KB
testcase_16 AC 1 ms
4,380 KB
testcase_17 AC 1 ms
4,380 KB
testcase_18 AC 1 ms
4,380 KB
testcase_19 AC 2 ms
4,376 KB
testcase_20 AC 2 ms
4,376 KB
testcase_21 AC 1 ms
4,376 KB
testcase_22 AC 1 ms
4,376 KB
testcase_23 AC 1 ms
4,376 KB
testcase_24 AC 1 ms
4,376 KB
testcase_25 AC 1 ms
4,376 KB
testcase_26 AC 1 ms
4,376 KB
testcase_27 AC 1 ms
4,376 KB
testcase_28 AC 1 ms
4,380 KB
testcase_29 AC 1 ms
4,380 KB
testcase_30 AC 1 ms
4,376 KB
testcase_31 AC 2 ms
4,376 KB
testcase_32 AC 1 ms
4,376 KB
testcase_33 AC 2 ms
4,376 KB
testcase_34 AC 1 ms
4,380 KB
testcase_35 AC 1 ms
4,380 KB
testcase_36 AC 1 ms
4,376 KB
testcase_37 AC 2 ms
4,380 KB
testcase_38 AC 1 ms
4,376 KB
testcase_39 AC 2 ms
4,380 KB
testcase_40 AC 2 ms
4,376 KB
testcase_41 AC 1 ms
4,376 KB
testcase_42 AC 2 ms
4,376 KB
testcase_43 AC 2 ms
4,376 KB
testcase_44 AC 2 ms
4,380 KB
testcase_45 AC 1 ms
4,376 KB
testcase_46 AC 1 ms
4,376 KB
testcase_47 AC 1 ms
4,376 KB
testcase_48 AC 1 ms
4,376 KB
testcase_49 AC 1 ms
4,380 KB
testcase_50 AC 1 ms
4,380 KB
testcase_51 AC 2 ms
4,376 KB
testcase_52 AC 2 ms
4,376 KB
testcase_53 AC 1 ms
4,376 KB
testcase_54 AC 2 ms
4,376 KB
testcase_55 AC 1 ms
4,376 KB
testcase_56 AC 2 ms
4,376 KB
testcase_57 AC 1 ms
4,376 KB
testcase_58 AC 1 ms
4,376 KB
testcase_59 AC 2 ms
4,376 KB
testcase_60 AC 2 ms
4,376 KB
testcase_61 AC 1 ms
4,376 KB
testcase_62 AC 1 ms
4,380 KB
testcase_63 AC 1 ms
4,376 KB
testcase_64 AC 2 ms
4,380 KB
testcase_65 AC 1 ms
4,376 KB
testcase_66 AC 1 ms
4,380 KB
testcase_67 AC 2 ms
4,376 KB
testcase_68 AC 1 ms
4,376 KB
testcase_69 AC 1 ms
4,376 KB
testcase_70 AC 1 ms
4,376 KB
testcase_71 AC 2 ms
4,380 KB
testcase_72 AC 1 ms
4,380 KB
testcase_73 AC 1 ms
4,380 KB
testcase_74 AC 1 ms
4,380 KB
testcase_75 AC 1 ms
4,380 KB
testcase_76 AC 1 ms
4,380 KB
testcase_77 AC 2 ms
4,380 KB
testcase_78 AC 2 ms
4,380 KB
testcase_79 AC 1 ms
4,380 KB
testcase_80 AC 1 ms
4,376 KB
testcase_81 AC 1 ms
4,376 KB
testcase_82 AC 2 ms
4,376 KB
testcase_83 AC 1 ms
4,376 KB
testcase_84 AC 1 ms
4,380 KB
testcase_85 AC 1 ms
4,376 KB
testcase_86 AC 2 ms
4,376 KB
testcase_87 AC 1 ms
4,376 KB
testcase_88 AC 1 ms
4,380 KB
testcase_89 AC 1 ms
4,376 KB
testcase_90 AC 1 ms
4,376 KB
testcase_91 AC 2 ms
4,380 KB
testcase_92 AC 2 ms
4,380 KB
testcase_93 AC 2 ms
4,380 KB
testcase_94 AC 1 ms
4,376 KB
testcase_95 AC 1 ms
4,376 KB
testcase_96 AC 1 ms
4,376 KB
testcase_97 AC 1 ms
4,376 KB
testcase_98 AC 1 ms
4,376 KB
testcase_99 AC 1 ms
4,376 KB
testcase_100 AC 2 ms
4,384 KB
testcase_101 AC 2 ms
4,376 KB
testcase_102 AC 1 ms
4,380 KB
testcase_103 AC 2 ms
4,380 KB
testcase_104 AC 2 ms
4,380 KB
testcase_105 AC 1 ms
4,376 KB
testcase_106 AC 1 ms
4,376 KB
testcase_107 AC 1 ms
4,380 KB
testcase_108 AC 1 ms
4,380 KB
testcase_109 AC 1 ms
4,376 KB
testcase_110 AC 2 ms
4,376 KB
testcase_111 AC 1 ms
4,376 KB
testcase_112 AC 1 ms
4,384 KB
testcase_113 AC 1 ms
4,380 KB
testcase_114 AC 1 ms
4,380 KB
testcase_115 AC 1 ms
4,380 KB
testcase_116 AC 1 ms
4,376 KB
testcase_117 AC 2 ms
4,380 KB
testcase_118 AC 2 ms
4,380 KB
testcase_119 AC 1 ms
4,380 KB
testcase_120 AC 1 ms
4,380 KB
testcase_121 AC 2 ms
4,376 KB
testcase_122 AC 2 ms
4,380 KB
testcase_123 AC 1 ms
4,380 KB
testcase_124 AC 2 ms
4,380 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <bits/stdc++.h>
using namespace std;
using lint = long long;
using pint = pair<int, int>;
using plint = pair<lint, lint>;
struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define ALL(x) (x).begin(), (x).end()
#define FOR(i, begin, end) for(int i=(begin),i##_end_=(end);i<i##_end_;i++)
#define IFOR(i, begin, end) for(int i=(end)-1,i##_begin_=(begin);i>=i##_begin_;i--)
#define REP(i, n) FOR(i,0,n)
#define IREP(i, n) IFOR(i,0,n)
template <typename T> void ndarray(vector<T> &vec, int len) { vec.resize(len); }
template <typename T, typename... Args> void ndarray(vector<T> &vec, int len, Args... args) { vec.resize(len); for (auto &v : vec) ndarray(v, args...); }
template <typename V, typename T> void ndfill(V &x, const T &val) { x = val; }
template <typename V, typename T> void ndfill(vector<V> &vec, const T &val) { for (auto &v : vec) ndfill(v, val); }
template <typename T> bool chmax(T &m, const T q) { if (m < q) {m = q; return true;} else return false; }
template <typename T> bool chmin(T &m, const T q) { if (m > q) {m = q; return true;} else return false; }
template <typename T1, typename T2> pair<T1, T2> operator+(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first + r.first, l.second + r.second); }
template <typename T1, typename T2> pair<T1, T2> operator-(const pair<T1, T2> &l, const pair<T1, T2> &r) { return make_pair(l.first - r.first, l.second - r.second); }
template <typename T> vector<T> srtunq(vector<T> vec) { sort(vec.begin(), vec.end()), vec.erase(unique(vec.begin(), vec.end()), vec.end()); return vec; }
template <typename T> istream &operator>>(istream &is, vector<T> &vec) { for (auto &v : vec) is >> v; return is; }
template <typename T> ostream &operator<<(ostream &os, const vector<T> &vec) { os << '['; for (auto v : vec) os << v << ','; os << ']'; return os; }
#if __cplusplus >= 201703L
template <typename... T> istream &operator>>(istream &is, tuple<T...> &tpl) { std::apply([&is](auto &&... args) { ((is >> args), ...);}, tpl); return is; }
template <typename... T> ostream &operator<<(ostream &os, const tuple<T...> &tpl) { std::apply([&os](auto &&... args) { ((os << args << ','), ...);}, tpl); return os; }
#endif
template <typename T> ostream &operator<<(ostream &os, const deque<T> &vec) { os << "deq["; for (auto v : vec) os << v << ','; os << ']'; return os; }
template <typename T> ostream &operator<<(ostream &os, const set<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_set<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T> ostream &operator<<(ostream &os, const unordered_multiset<T> &vec) { os << '{'; for (auto v : vec) os << v << ','; os << '}'; return os; }
template <typename T1, typename T2> ostream &operator<<(ostream &os, const pair<T1, T2> &pa) { os << '(' << pa.first << ',' << pa.second << ')'; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const map<TK, TV> &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; }
template <typename TK, typename TV> ostream &operator<<(ostream &os, const unordered_map<TK, TV> &mp) { os << '{'; for (auto v : mp) os << v.first << "=>" << v.second << ','; os << '}'; return os; }
#ifdef HITONANODE_LOCAL
#define dbg(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ") " << __FILE__ << endl
#else
#define dbg(x)
#endif

template <typename T_P>
std::pair<int, std::vector<T_P>> quadratic_solver(T_P A, T_P B, T_P C)
{
    if (B < 0) A = -A, B = -B, C = -C;
    if (A == 0) {
        if (B == 0) {
            if (C == 0) return std::make_pair(-1, std::vector<T_P>{});  // all real numbers
            else return std::make_pair(0, std::vector<T_P>{});  // no solution
        }
        else return std::make_pair(1, std::vector<T_P>{-C / B});
    }
    T_P D = B * B - 4 * A * C;
    if (D < 0) return std::make_pair(0, std::vector<T_P>{});
    if (D == 0) return std::make_pair(1, std::vector<T_P>{-B / (2 * A)});
    T_P ret1 = (-B - sqrt(D)) / (2 * A), ret2 = C / A / ret1;
    if (ret1 > ret2) swap(ret1, ret2);
    return std::make_pair(2, std::vector<T_P>{ret1, ret2});
}

int main()
{
    long double A, B, C;
    cin >> A >> B >> C;
    auto [nb, rets] = quadratic_solver(A, B, C);
    cout << nb << '\n';
    for (auto x : rets) cout << x << '\n';
}
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