結果

問題 No.173 カードゲーム(Medium)
ユーザー torus711torus711
提出日時 2015-03-26 23:57:47
言語 C++11
(gcc 13.3.0)
結果
AC  
実行時間 1,981 ms / 3,000 ms
コード長 3,289 bytes
コンパイル時間 1,023 ms
コンパイル使用メモリ 107,472 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-06-29 01:11:24
合計ジャッジ時間 13,593 ms
ジャッジサーバーID
(参考情報)
judge1 / judge2
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
other AC * 10
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 #
プレゼンテーションモードにする

#include <iostream>
#include <iomanip>
#include <sstream>
#include <vector>
#include <string>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <stack>
#include <queue>
#include <deque>
#include <algorithm>
#include <functional>
#include <iterator>
#include <limits>
#include <numeric>
#include <utility>
#include <cmath>
#include <cassert>
#include <cstdio>
using namespace std; using namespace placeholders;
using LL = long long;
using ULL = unsigned long long;
using VI = vector< int >;
using VVI = vector< vector< int > >;
using VS = vector< string >;
using SS = stringstream;
using PII = pair< int, int >;
using VPII = vector< pair< int, int > >;
template < typename T = int > using VT = vector< T >;
template < typename T = int > using VVT = vector< vector< T > >;
template < typename T = int > using LIM = numeric_limits< T >;
template < typename T > inline istream& operator>>( istream &s, vector< T > &v ){ for ( T &t : v ) { s >> t; } return s; }
template < typename T > inline ostream& operator<<( ostream &s, const vector< T > &v ){ for ( int i = 0; i < int( v.size() ); ++i ){ s << ( " " + !i
    ) << v[i]; } return s; }
template < typename T > inline T fromString( const string &s ) { T res; istringstream iss( s ); iss >> res; return res; };
template < typename T > inline string toString( const T &a ) { ostringstream oss; oss << a; return oss.str(); };
#define REP2( i, n ) REP3( i, 0, n )
#define REP3( i, m, n ) for ( int i = ( int )( m ); i < ( int )( n ); ++i )
#define GET_REP( a, b, c, F, ... ) F
#define REP( ... ) GET_REP( __VA_ARGS__, REP3, REP2 )( __VA_ARGS__ )
#define FOR( e, c ) for ( auto &e : c )
#define ALL( c ) ( c ).begin(), ( c ).end()
#define AALL( a, t ) ( t* )a, ( t* )a + sizeof( a ) / sizeof( t )
#define DRANGE( c, p ) ( c ).begin(), ( c ).begin() + p, ( c ).end()
#define SZ( v ) ( (int)( v ).size() )
#define PB push_back
#define EM emplace
#define EB emplace_back
#define BI back_inserter
#define EXIST( c, e ) ( ( c ).find( e ) != ( c ).end() )
#define MP make_pair
#define fst first
#define snd second
#define DUMP( x ) cerr << #x << " = " << ( x ) << endl
#include <random>
mt19937 rng;
uniform_int_distribution< int > rng_idx( 1, 19 );
uniform_real_distribution< double > rng_p( 0, 1 );
constexpr int SIM = 1000000;
int N;
double Pa, Pb;
inline int select( const double p, VI &as )
{
if ( SZ( as ) == 1 )
{
return as[0];
}
else if ( rng_p( rng ) <= p )
{
const int res = as[0];
as.erase( as.begin() );
return res;
}
else
{
rng_idx.param( uniform_int_distribution< int >::param_type( 1, SZ( as ) - 1 ) );
const int idx = rng_idx( rng );
const int res = as[ idx ];
as.erase( as.begin() + idx );
return res;
}
}
inline bool sim( VI as, VI bs )
{
int pt1 = 0, pt2 = 0;
REP( i, N )
{
const int a = select( Pa, as );
const int b = select( Pb, bs );
if ( a < b )
{
pt2 += a + b;
}
if ( a > b )
{
pt1 += a + b;
}
}
return pt1 > pt2;
}
int main()
{
cin.tie( 0 );
ios::sync_with_stdio( false );
cin >> N >> Pa >> Pb;
VI as( N ), bs( N );
cin >> as >> bs;
sort( ALL( as ) );
sort( ALL( bs ) );
int win = 0;
REP( i, SIM )
{
win += sim( as, bs );
}
cout << setprecision( 5 ) << fixed << 1. * win / SIM << endl;
return 0;
}
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