結果

問題 No.955 ax^2+bx+c=0
ユーザー Konton7Konton7
提出日時 2020-06-16 01:50:16
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 5,966 bytes
コンパイル時間 2,079 ms
コンパイル使用メモリ 205,088 KB
実行使用メモリ 4,508 KB
最終ジャッジ日時 2023-09-16 10:47:41
合計ジャッジ時間 5,702 ms
ジャッジサーバーID
(参考情報)
judge14 / judge15
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 1 ms
4,376 KB
testcase_01 WA -
testcase_02 AC 1 ms
4,380 KB
testcase_03 AC 1 ms
4,376 KB
testcase_04 AC 2 ms
4,380 KB
testcase_05 AC 2 ms
4,380 KB
testcase_06 AC 1 ms
4,376 KB
testcase_07 AC 1 ms
4,376 KB
testcase_08 AC 1 ms
4,376 KB
testcase_09 AC 1 ms
4,376 KB
testcase_10 AC 1 ms
4,380 KB
testcase_11 AC 1 ms
4,376 KB
testcase_12 AC 1 ms
4,376 KB
testcase_13 AC 2 ms
4,380 KB
testcase_14 AC 2 ms
4,376 KB
testcase_15 AC 1 ms
4,380 KB
testcase_16 AC 1 ms
4,380 KB
testcase_17 AC 2 ms
4,376 KB
testcase_18 AC 2 ms
4,380 KB
testcase_19 AC 2 ms
4,376 KB
testcase_20 AC 2 ms
4,376 KB
testcase_21 AC 2 ms
4,376 KB
testcase_22 AC 2 ms
4,376 KB
testcase_23 AC 2 ms
4,376 KB
testcase_24 WA -
testcase_25 WA -
testcase_26 WA -
testcase_27 WA -
testcase_28 WA -
testcase_29 WA -
testcase_30 WA -
testcase_31 WA -
testcase_32 WA -
testcase_33 WA -
testcase_34 AC 2 ms
4,376 KB
testcase_35 AC 2 ms
4,380 KB
testcase_36 AC 2 ms
4,376 KB
testcase_37 AC 2 ms
4,380 KB
testcase_38 AC 2 ms
4,376 KB
testcase_39 AC 2 ms
4,376 KB
testcase_40 AC 2 ms
4,380 KB
testcase_41 AC 2 ms
4,376 KB
testcase_42 AC 1 ms
4,380 KB
testcase_43 AC 2 ms
4,376 KB
testcase_44 AC 1 ms
4,376 KB
testcase_45 AC 2 ms
4,380 KB
testcase_46 AC 2 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
4,376 KB
testcase_50 AC 1 ms
4,380 KB
testcase_51 AC 1 ms
4,376 KB
testcase_52 AC 1 ms
4,380 KB
testcase_53 AC 1 ms
4,380 KB
testcase_54 AC 2 ms
4,380 KB
testcase_55 AC 2 ms
4,380 KB
testcase_56 AC 2 ms
4,380 KB
testcase_57 AC 2 ms
4,380 KB
testcase_58 WA -
testcase_59 WA -
testcase_60 AC 2 ms
4,376 KB
testcase_61 AC 1 ms
4,380 KB
testcase_62 AC 2 ms
4,376 KB
testcase_63 AC 2 ms
4,376 KB
testcase_64 AC 1 ms
4,376 KB
testcase_65 AC 1 ms
4,380 KB
testcase_66 AC 2 ms
4,380 KB
testcase_67 AC 1 ms
4,380 KB
testcase_68 AC 1 ms
4,376 KB
testcase_69 AC 1 ms
4,380 KB
testcase_70 AC 2 ms
4,376 KB
testcase_71 AC 2 ms
4,380 KB
testcase_72 AC 2 ms
4,380 KB
testcase_73 AC 2 ms
4,376 KB
testcase_74 AC 2 ms
4,376 KB
testcase_75 AC 1 ms
4,376 KB
testcase_76 AC 1 ms
4,376 KB
testcase_77 AC 2 ms
4,380 KB
testcase_78 AC 2 ms
4,384 KB
testcase_79 AC 2 ms
4,380 KB
testcase_80 AC 1 ms
4,380 KB
testcase_81 AC 2 ms
4,376 KB
testcase_82 WA -
testcase_83 WA -
testcase_84 WA -
testcase_85 WA -
testcase_86 WA -
testcase_87 WA -
testcase_88 WA -
testcase_89 WA -
testcase_90 WA -
testcase_91 WA -
testcase_92 AC 1 ms
4,380 KB
testcase_93 AC 1 ms
4,376 KB
testcase_94 WA -
testcase_95 WA -
testcase_96 WA -
testcase_97 WA -
testcase_98 WA -
testcase_99 WA -
testcase_100 AC 2 ms
4,376 KB
testcase_101 WA -
testcase_102 AC 1 ms
4,376 KB
testcase_103 AC 1 ms
4,380 KB
testcase_104 AC 2 ms
4,376 KB
testcase_105 AC 1 ms
4,376 KB
testcase_106 AC 2 ms
4,376 KB
testcase_107 AC 2 ms
4,380 KB
testcase_108 AC 2 ms
4,380 KB
testcase_109 AC 2 ms
4,376 KB
testcase_110 AC 1 ms
4,380 KB
testcase_111 AC 1 ms
4,380 KB
testcase_112 AC 2 ms
4,376 KB
testcase_113 AC 1 ms
4,380 KB
testcase_114 AC 2 ms
4,380 KB
testcase_115 AC 2 ms
4,376 KB
testcase_116 AC 2 ms
4,376 KB
testcase_117 AC 1 ms
4,380 KB
testcase_118 AC 1 ms
4,380 KB
testcase_119 AC 2 ms
4,376 KB
testcase_120 AC 1 ms
4,376 KB
testcase_121 AC 2 ms
4,380 KB
testcase_122 AC 2 ms
4,380 KB
testcase_123 AC 2 ms
4,376 KB
testcase_124 AC 2 ms
4,376 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 ll = long long;
using VI = vector<int>;
using VL = vector<ll>;
using VS = vector<string>;
using VB = vector<bool>;
using VVI = vector<VI>;
using VVL = vector<VL>;
using PII = std::pair<int, int>;
using PLL = std::pair<ll, ll>;
using TI3 = std::tuple<int, int, int>;
using TI4 = std::tuple<int, int, int, int>;
using TL3 = std::tuple<ll, ll, ll>;
using TL4 = std::tuple<ll, ll, ll, ll>;

#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n)-1; i >= 0; i--)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)
#define rep3(i, s, n, d) for (int i = (s); i < (int)(n); i += (d))
#define allpt(v) (v).begin(), (v).end()
#define allpt_c(v) (v).cbegin(), (v).cend()
#define allpt_r(v) (v).rbegin(), (v).rend()

const int mod1 = 1e9 + 7, mod2 = 998244353, mod3 = 1e9 + 9;
const int mod = mod1;
const ll inf = 1e18;

const string wsp = " ";
const string tb = "\t";
const string rt = "\n";

template <typename T>
void show1dvec(const vector<T> &v)
{
    if (v.size() == 0)
        return;
    int n = v.size() - 1;
    rep(i, n) cout << v[i] << wsp;
    cout << v[n] << rt;

    return;
}

template <typename T>
void show2dvec(const vector<vector<T>> &v)
{
    int n = v.size();
    rep(i, n) show1dvec(v[i]);
}

template <typename T, typename S>
void show1dpair(const vector<pair<T, S>> &v)
{
    int n = v.size();
    rep(i, n) cout << v[i].first << wsp << v[i].second << rt;
    return;
}

template <typename T, typename S>
void pairzip(const vector<pair<T, S>> &v, vector<T> &t, vector<T> &s)
{
    int n = v.size();
    rep(i, n)
    {
        t.push_back(v[i].first);
        s.push_back(v[i].second);
    }
    return;
}

template <typename T>
void maxvec(vector<T> &v)
{
    T s = v[0];
    int n = v.size();
    rep(i, n - 1)
    {
        if (s > v[i + 1])
        {
            v[i + 1] = s;
        }
        s = v[i + 1];
    }
}

template <typename T, typename S>
bool myfind(T t, S s)
{
    return find(t.cbegin(), t.cend(), s) != t.cend();
}

bool check(int y, int x, int h, int w)
{
    return 0 <= y && y < h && 0 <= x && x < w;
}

template <typename T>
vector<T> cumsum(const vector<T> &v)
{
    T s = 0;
    vector<T> ret;

    rep(i, v.size())
    {
        s += v[i];
        s %= mod;
        ret.emplace_back(s);
    }
    return ret;
}

bool iskadomatsu(int a, int b, int c)
{
    return (a != b && b != c && c != a) && ((a > b && b < c) || (a < b && b > c));
}

VS split(string s, char c)
{
    VS ret;
    string part;
    s += c;
    rep(i, s.length())
    {
        if (s[i] == c)
        {
            ret.emplace_back(part);
            part = "";
        }
        else if (s[i] != c)
        {
            part += s[i];
        }
    }
    return ret;
}

string removezero(string &s)
{
    string ret;
    for (auto z : s)
        if (z != '0')
            ret += z;
    return ret;
}

ll sumdigit(ll x)
{
    ll ans{0};
    while (x > 0)
    {
        ans += x % 10;
        x /= 10;
    }
    return ans;
}

template <typename T, typename S, typename R>
ll pow_mod(T p, S q, R mod = 1ll)
{
    ll ret = 1, r = p;
    while (q)
    {
        if (q % 2)
            ret *= r, ret %= mod;
        r = (r * r) % mod, q /= 2;
    }
    return ret % mod;
}

template <typename T, typename S>
ll pow_no_mod(T p, S q)
{
    ll ret = 1, r = p;
    while (q)
    {
        if (q % 2)
            ret *= r;
        r = (r * r), q /= 2;
    }
    return ret;
}

void make_frac_tables(VL &frac_list, VL &frac_inv_list)
{
    rep(i, frac_list.size() - 1)
    {
        frac_list[i + 1] *= frac_list[i] * (i + 1);
        frac_list[i + 1] %= mod;
        frac_inv_list[i + 1] *= frac_inv_list[i] * pow_mod(i + 1, mod - 2, mod);
        frac_inv_list[i + 1] %= mod;
    }
}

ll comb(int a, int b, const VL &frac_list, const VL &frac_inv_list)
{
    if (a < b)
        return 0;
    if (b < 0)
        return 0;
    ll ret = frac_list[a];
    ret *= frac_inv_list[b];
    ret %= mod;
    ret *= frac_inv_list[a - b];
    ret %= mod;
    return ret;
}

void solve_eq(double a, double b, double c)
{
    if (a < 0)
    {
        a *= -1;
        b *= -1;
        c *= -1;
    }
    double l, r, mid;
    l = -2e9;
    r = -b / (2 * a);
    rep(i, 100)
    {
        mid = (l + r) / 2;
        if (a * mid * mid + b * mid + c >= 0)
        {
            l = mid;        
        } 
        else
        {
            r = mid;
        }   
    }
    printf("%.30f\n", r);

    r = 2e9;
    l = -b / (2 * a);
    rep(i, 100)
    {
        mid = (l + r) / 2;
        if (a * mid * mid + b * mid + c <= 0)
        {
            l = mid;        
        } 
        else
        {
            r = mid;
        }   
    }
    printf("%.30f\n", r);
}




int main()
{

    cin.tie(0);
    ios::sync_with_stdio(false);

#ifdef DEBUG
    cout << "DEBUG MODE" << endl;
    ifstream in("input.txt"); //for debug
    cin.rdbuf(in.rdbuf());    //for debug
#endif

    ll ai, bi, ci;
    double a, b, c, d, x1, x2;
    cin >> ai >> bi >> ci;
    a = 1.0 * ai;
    b = 1.0 * bi;
    c = 1.0 * ci;

    if (a == 0)
    {
        if (b == 0)
        {
            if (c == 0)
            {
                cout << -1 << rt;
            }
            else
            {
                cout << 0 << rt;
            }
        }
        else
        {
            cout << 1 << endl;
            printf("%.12f\n", -c / b);
        }
    }
    else
    {
        if (bi * bi - 4 * ai * ci > 0)
        {
            d = b * b - 4 * a * c;
            x1 = (-b - sqrt(d)) / (2.0 * a);
            x2 = (-b + sqrt(d)) / (2.0 * a);
            if (x1 > x2)
                swap(x1, x2);
            cout << 2 << endl;
            solve_eq(a, b, c);
        }
        else if (bi * bi - 4 * ai * ci == 0)
        {
            cout << 1 << endl;
            printf("%.20\n", -b / (2.0 * a));
        }
        else
        {
            cout << 0 << rt;
        }
    }

    return 0;
}
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