#450198 (C++17) No.955 ax^2+bx+c=0

• 問題: No.955 ax^2+bx+c=0
• ユーザー: ngtkana
• 提出日時: 2020-03-28 01:26:39
• 言語: C++17 (gcc 12.3.0 + boost 1.83.0)
• 結果: WA
• 実行時間: -
• コード長: 2,316 bytes
• コンパイル時間: 2,296 ms
• コンパイル使用メモリ: 204,940 KB
• 実行使用メモリ: 4,384 KB
• 最終ジャッジ日時: 2023-08-30 17:14:34
• 合計ジャッジ時間: 5,724 ms
• ジャッジサーバーID （参考情報）: judge11 / judge13

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; 4,376 KB
testcase_03	AC	1 ms; 4,376 KB
testcase_04	AC	2 ms; 4,376 KB
testcase_05	AC	2 ms; 4,380 KB
testcase_06	AC	2 ms; 4,380 KB
testcase_07	AC	1 ms; 4,376 KB
testcase_08	AC	2 ms; 4,376 KB
testcase_09	AC	1 ms; 4,380 KB
testcase_10	AC	2 ms; 4,376 KB
testcase_11	AC	1 ms; 4,380 KB
testcase_12	AC	1 ms; 4,376 KB
testcase_13	AC	2 ms; 4,376 KB
testcase_14	AC	2 ms; 4,380 KB
testcase_15	AC	2 ms; 4,376 KB
testcase_16	AC	2 ms; 4,380 KB
testcase_17	AC	1 ms; 4,376 KB
testcase_18	AC	1 ms; 4,376 KB
testcase_19	AC	1 ms; 4,380 KB
testcase_20	AC	1 ms; 4,380 KB
testcase_21	AC	1 ms; 4,380 KB
testcase_22	AC	2 ms; 4,380 KB
testcase_23	AC	1 ms; 4,384 KB
testcase_24	AC	1 ms; 4,376 KB
testcase_25	AC	2 ms; 4,376 KB
testcase_26	AC	1 ms; 4,380 KB
testcase_27	AC	1 ms; 4,376 KB
testcase_28	AC	1 ms; 4,376 KB
testcase_29	AC	2 ms; 4,376 KB
testcase_30	AC	2 ms; 4,376 KB
testcase_31	AC	1 ms; 4,376 KB
testcase_32	AC	1 ms; 4,380 KB
testcase_33	AC	2 ms; 4,376 KB
testcase_34	AC	1 ms; 4,376 KB
testcase_35	AC	1 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; 4,380 KB
testcase_39	AC	1 ms; 4,376 KB
testcase_40	AC	2 ms; 4,376 KB
testcase_41	AC	2 ms; 4,376 KB
testcase_42	AC	2 ms; 4,380 KB
testcase_43	AC	1 ms; 4,380 KB
testcase_44	AC	1 ms; 4,376 KB
testcase_45	AC	2 ms; 4,376 KB
testcase_46	AC	2 ms; 4,376 KB
testcase_47	AC	1 ms; 4,380 KB
testcase_48	AC	1 ms; 4,380 KB
testcase_49	AC	2 ms; 4,376 KB
testcase_50	AC	1 ms; 4,376 KB
testcase_51	AC	2 ms; 4,376 KB
testcase_52	AC	1 ms; 4,376 KB
testcase_53	AC	2 ms; 4,380 KB
testcase_54	AC	2 ms; 4,376 KB
testcase_55	AC	2 ms; 4,376 KB
testcase_56	AC	2 ms; 4,376 KB
testcase_57	AC	2 ms; 4,380 KB
testcase_58	WA	-
testcase_59	AC	2 ms; 4,376 KB
testcase_60	AC	2 ms; 4,376 KB
testcase_61	AC	1 ms; 4,380 KB
testcase_62	AC	1 ms; 4,376 KB
testcase_63	AC	2 ms; 4,376 KB
testcase_64	AC	2 ms; 4,380 KB
testcase_65	AC	2 ms; 4,376 KB
testcase_66	AC	2 ms; 4,376 KB
testcase_67	AC	1 ms; 4,380 KB
testcase_68	AC	2 ms; 4,380 KB
testcase_69	AC	2 ms; 4,380 KB
testcase_70	AC	2 ms; 4,380 KB
testcase_71	AC	1 ms; 4,380 KB
testcase_72	AC	1 ms; 4,376 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	2 ms; 4,376 KB
testcase_77	AC	2 ms; 4,376 KB
testcase_78	AC	2 ms; 4,376 KB
testcase_79	AC	1 ms; 4,380 KB
testcase_80	AC	1 ms; 4,380 KB
testcase_81	AC	2 ms; 4,376 KB
testcase_82	AC	2 ms; 4,380 KB
testcase_83	AC	1 ms; 4,376 KB
testcase_84	AC	2 ms; 4,376 KB
testcase_85	AC	2 ms; 4,380 KB
testcase_86	AC	2 ms; 4,380 KB
testcase_87	AC	2 ms; 4,380 KB
testcase_88	AC	2 ms; 4,380 KB
testcase_89	AC	2 ms; 4,376 KB
testcase_90	AC	2 ms; 4,376 KB
testcase_91	AC	1 ms; 4,380 KB
testcase_92	AC	2 ms; 4,380 KB
testcase_93	AC	2 ms; 4,376 KB
testcase_94	AC	2 ms; 4,376 KB
testcase_95	AC	2 ms; 4,376 KB
testcase_96	AC	1 ms; 4,380 KB
testcase_97	AC	2 ms; 4,380 KB
testcase_98	AC	1 ms; 4,380 KB
testcase_99	AC	1 ms; 4,376 KB
testcase_100	AC	2 ms; 4,376 KB
testcase_101	AC	2 ms; 4,380 KB
testcase_102	AC	2 ms; 4,376 KB
testcase_103	AC	1 ms; 4,380 KB
testcase_104	AC	2 ms; 4,380 KB
testcase_105	AC	2 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; 4,376 KB
testcase_109	AC	1 ms; 4,376 KB
testcase_110	AC	2 ms; 4,380 KB
testcase_111	AC	1 ms; 4,376 KB
testcase_112	AC	1 ms; 4,376 KB
testcase_113	AC	1 ms; 4,380 KB
testcase_114	AC	2 ms; 4,376 KB
testcase_115	AC	1 ms; 4,376 KB
testcase_116	AC	2 ms; 4,380 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	2 ms; 4,380 KB
testcase_121	AC	1 ms; 4,376 KB
testcase_122	AC	1 ms; 4,376 KB
testcase_123	AC	1 ms; 4,380 KB
testcase_124	AC	2 ms; 4,380 KB

コンパイルメッセージ

main.cpp: ラムダ関数内:
main.cpp:34:27: 警告: narrowing conversion of ‘c’ from ‘const lint’ {aka ‘const long long int’} to ‘real’ {aka ‘long double’} [-Wnarrowing]
   34 |             return {-real{c}/b};
      |                           ^
main.cpp:34:27: 警告: narrowing conversion of ‘(lint)c’ from ‘lint’ {aka ‘long long int’} to ‘real’ {aka ‘long double’} [-Wnarrowing]
main.cpp:37:22: 警告: narrowing conversion of ‘b’ from ‘const lint’ {aka ‘const long long int’} to ‘real’ {aka ‘long double’} [-Wnarrowing]
   37 |         real x=-real{b}/(2*a);
      |                      ^
main.cpp:37:22: 警告: narrowing conversion of ‘(lint)b’ from ‘lint’ {aka ‘long long int’} to ‘real’ {aka ‘long double’} [-Wnarrowing]

ソースコード

#include<bits/stdc++.h>
using lint=long long;
using real=long double;
void debug_impl(){std::cerr<<'\n';}
template<class Head,class...Tail>void debug_impl(Head head, Tail... tail){std::cerr << " " << head;debug_impl(tail...);}
    template<class Container,class Value=typename Container::value_type,std::enable_if_t<!std::is_same<Container,std::string>::value,std::nullptr_t> = nullptr>
std::ostream&operator<<(std::ostream&os,Container const&v)
{os<<"{";for(auto it=v.begin();it!=v.end();it++){os<<(it!=v.begin()?",":"")<<*it;}return os<<"}";}
    template<template<class...>class Tuple,class...Args,std::size_t...Inds,std::size_t=std::tuple_size<Tuple<Args...>>::value>
std::ostream&tuple_output_impl(std::ostream&os,const Tuple<Args...>&tuple,std::integer_sequence<std::size_t,Inds...>)
{os<<"(";(void)std::initializer_list<int>{((void)(os<<(Inds>0?",":"")<<std::get<Inds>(tuple)),0)...};return os<<")";}
    template<template<class...>class Tuple,class...Args,std::size_t=std::tuple_size<Tuple<Args...>>::value>
std::ostream&operator<<(std::ostream&os,const Tuple<Args...>&tuple)
{return tuple_output_impl(os,tuple,std::index_sequence_for<Args...>());}
#define DEBUG 1
#if DEBUG
#define debug(...)do{std::cerr<<std::boolalpha<<"["<<#__VA_ARGS__<<"]:";debug_impl(__VA_ARGS__);std::cerr<<std::noboolalpha;}while(false)
#else
#define debug(...) {}
#endif
int main(){
    std::cin.tie(nullptr);std::ios_base::sync_with_stdio(false);
    std::cout.setf(std::ios_base::fixed);std::cout.precision(30);
    lint a,b,c;std::cin>>a>>b>>c;
    auto ans=[a,b,c]()->std::vector<real>{
        if(a==0){
            if(b==0){
                if(c==0){
                    std::cout<<-1<<'\n';
                    exit(0);
                }
                return {};
            }
            return {-real{c}/b};
        }
        lint D=b*b-4*a*c;
        real x=-real{b}/(2*a);
        if(D<0)return {};
        if(D==0)return {x};
        real y=real{4}*a*c/(b*b);
        debug(x,y);
        std::vector<real>ans(2);
        ans.at(0)=x*(1+std::sqrt(1-y));
        ans.at(1)=std::abs(y)<1e-6
            ?x*(y/2+y*y/8+y*y*y/16)
            :x*(1-std::sqrt(1-y));
        return ans;
    }();
    std::sort(ans.begin(),ans.end());
    std::cout<<ans.size()<<'\n';
    for(real x:ans){
        std::cout<<x<<'\n';
    }
}