結果

問題 No.955 ax^2+bx+c=0
ユーザー trineutrontrineutron
提出日時 2019-12-07 18:38:26
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
WA  
実行時間 -
コード長 2,343 bytes
コンパイル時間 1,269 ms
コンパイル使用メモリ 168,084 KB
実行使用メモリ 6,948 KB
最終ジャッジ日時 2024-07-06 23:30:20
合計ジャッジ時間 3,433 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
このコードへのチャレンジ
(要ログイン)

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
6,816 KB
testcase_01 AC 1 ms
6,940 KB
testcase_02 AC 1 ms
6,944 KB
testcase_03 AC 1 ms
6,944 KB
testcase_04 AC 1 ms
6,944 KB
testcase_05 AC 1 ms
6,940 KB
testcase_06 AC 1 ms
6,940 KB
testcase_07 AC 1 ms
6,940 KB
testcase_08 AC 1 ms
6,944 KB
testcase_09 AC 1 ms
6,944 KB
testcase_10 AC 1 ms
6,944 KB
testcase_11 AC 1 ms
6,944 KB
testcase_12 AC 1 ms
6,940 KB
testcase_13 AC 1 ms
6,944 KB
testcase_14 AC 1 ms
6,940 KB
testcase_15 AC 1 ms
6,944 KB
testcase_16 AC 1 ms
6,940 KB
testcase_17 AC 2 ms
6,940 KB
testcase_18 AC 2 ms
6,944 KB
testcase_19 AC 2 ms
6,940 KB
testcase_20 AC 2 ms
6,940 KB
testcase_21 AC 2 ms
6,940 KB
testcase_22 AC 2 ms
6,944 KB
testcase_23 AC 1 ms
6,940 KB
testcase_24 AC 1 ms
6,940 KB
testcase_25 AC 1 ms
6,940 KB
testcase_26 AC 2 ms
6,944 KB
testcase_27 AC 2 ms
6,940 KB
testcase_28 AC 2 ms
6,940 KB
testcase_29 AC 2 ms
6,940 KB
testcase_30 AC 1 ms
6,940 KB
testcase_31 AC 1 ms
6,940 KB
testcase_32 AC 1 ms
6,940 KB
testcase_33 AC 1 ms
6,944 KB
testcase_34 AC 2 ms
6,944 KB
testcase_35 AC 2 ms
6,940 KB
testcase_36 AC 1 ms
6,940 KB
testcase_37 AC 1 ms
6,940 KB
testcase_38 AC 2 ms
6,940 KB
testcase_39 AC 1 ms
6,940 KB
testcase_40 AC 2 ms
6,944 KB
testcase_41 AC 2 ms
6,944 KB
testcase_42 AC 2 ms
6,940 KB
testcase_43 AC 2 ms
6,944 KB
testcase_44 AC 1 ms
6,944 KB
testcase_45 AC 1 ms
6,944 KB
testcase_46 AC 1 ms
6,940 KB
testcase_47 AC 2 ms
6,940 KB
testcase_48 AC 2 ms
6,944 KB
testcase_49 AC 2 ms
6,940 KB
testcase_50 AC 2 ms
6,940 KB
testcase_51 AC 1 ms
6,940 KB
testcase_52 AC 2 ms
6,940 KB
testcase_53 AC 2 ms
6,940 KB
testcase_54 AC 2 ms
6,940 KB
testcase_55 AC 1 ms
6,944 KB
testcase_56 AC 2 ms
6,944 KB
testcase_57 AC 2 ms
6,940 KB
testcase_58 WA -
testcase_59 WA -
testcase_60 AC 1 ms
6,940 KB
testcase_61 AC 1 ms
6,944 KB
testcase_62 AC 1 ms
6,944 KB
testcase_63 AC 2 ms
6,944 KB
testcase_64 AC 2 ms
6,944 KB
testcase_65 AC 2 ms
6,940 KB
testcase_66 AC 2 ms
6,940 KB
testcase_67 AC 1 ms
6,940 KB
testcase_68 AC 2 ms
6,940 KB
testcase_69 AC 2 ms
6,944 KB
testcase_70 AC 1 ms
6,944 KB
testcase_71 AC 2 ms
6,940 KB
testcase_72 AC 2 ms
6,940 KB
testcase_73 AC 1 ms
6,944 KB
testcase_74 AC 1 ms
6,940 KB
testcase_75 AC 1 ms
6,944 KB
testcase_76 AC 1 ms
6,940 KB
testcase_77 AC 1 ms
6,944 KB
testcase_78 AC 1 ms
6,940 KB
testcase_79 AC 1 ms
6,944 KB
testcase_80 AC 2 ms
6,940 KB
testcase_81 AC 1 ms
6,944 KB
testcase_82 AC 1 ms
6,940 KB
testcase_83 AC 2 ms
6,940 KB
testcase_84 AC 2 ms
6,940 KB
testcase_85 AC 2 ms
6,940 KB
testcase_86 AC 2 ms
6,944 KB
testcase_87 AC 1 ms
6,940 KB
testcase_88 AC 1 ms
6,944 KB
testcase_89 AC 1 ms
6,940 KB
testcase_90 AC 1 ms
6,944 KB
testcase_91 AC 2 ms
6,944 KB
testcase_92 AC 1 ms
6,944 KB
testcase_93 AC 2 ms
6,940 KB
testcase_94 AC 2 ms
6,944 KB
testcase_95 AC 2 ms
6,940 KB
testcase_96 AC 2 ms
6,940 KB
testcase_97 AC 2 ms
6,944 KB
testcase_98 AC 2 ms
6,940 KB
testcase_99 AC 1 ms
6,944 KB
testcase_100 AC 1 ms
6,944 KB
testcase_101 AC 1 ms
6,940 KB
testcase_102 AC 1 ms
6,944 KB
testcase_103 AC 1 ms
6,940 KB
testcase_104 AC 1 ms
6,940 KB
testcase_105 AC 1 ms
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testcase_106 AC 1 ms
6,940 KB
testcase_107 AC 1 ms
6,944 KB
testcase_108 AC 1 ms
6,940 KB
testcase_109 AC 1 ms
6,944 KB
testcase_110 AC 1 ms
6,944 KB
testcase_111 AC 2 ms
6,948 KB
testcase_112 AC 2 ms
6,944 KB
testcase_113 AC 2 ms
6,944 KB
testcase_114 AC 1 ms
6,944 KB
testcase_115 AC 1 ms
6,940 KB
testcase_116 AC 1 ms
6,944 KB
testcase_117 AC 1 ms
6,940 KB
testcase_118 AC 1 ms
6,944 KB
testcase_119 AC 2 ms
6,940 KB
testcase_120 AC 1 ms
6,940 KB
testcase_121 AC 2 ms
6,940 KB
testcase_122 AC 2 ms
6,944 KB
testcase_123 AC 1 ms
6,940 KB
testcase_124 AC 2 ms
6,940 KB
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ソースコード

diff #

#include <bits/stdc++.h>
using namespace std;

int64_t a, b, c, det;

double f(double x) {
    double plus = 0.0, minus = 0.0, ax2 = a * x * x, bx = b * x;
    if (ax2 >= 0) {
        plus += ax2;
    } else {
        minus += ax2;
    }
    if (bx >= 0) {
        plus += bx;
    } else {
        minus += bx;
    }
    if (c >= 0) {
        plus += c;
    } else {
        minus += c;
    }
    return plus + minus;
}

int main() {
    cin >> a >> b >> c;
    assert(-1000000000 <= a && a <= 1000000000);
    assert(-1000000000 <= b && b <= 1000000000);
    assert(-1000000000 <= c && c <= 1000000000);
    det = b * b - 4 * a * c;
    cout << setprecision(17);
    if (a == 0) {
        if (b == 0) {
            if (c == 0) {
                cout << -1 << endl;
            } else {
                cout << 0 << endl;
            }
        } else {
            cout << 1 << endl;
            cout << (double) -c / b << endl;
        }
    } else {
        if (det < 0) {
            cout << 0 << endl;
        } else if (det == 0) {
            cout << 1 << endl;
            cout << (double) -b / (2 * a) << endl;
        } else {
            cout << 2 << endl;
            double lower_bound = -10000000000, upper_bound = (double) -b / (2 * a);
            while (lower_bound < upper_bound) {
                double half = (lower_bound + upper_bound) / 2;
                if (f(lower_bound) == 0) break;
                if (f(lower_bound) * f(half) < 0) {
                    if (upper_bound == half) break;
                    upper_bound = half;
                } else {
                    if (lower_bound == half) break;
                    lower_bound = half;
                }
            }
            cout << lower_bound << endl;
            lower_bound = (double) -b / (2 * a);
            upper_bound = 10000000000;
            while (lower_bound < upper_bound) {
                double half = (lower_bound + upper_bound) / 2;
                if (f(lower_bound) == 0) break;
                if (f(lower_bound) * f(half) < 0) {
                    if (upper_bound == half) break;
                    upper_bound = half;
                } else {
                    if (lower_bound == half) break;
                    lower_bound = half;
                }
            }
            cout << lower_bound << endl;
        }
    }
}
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