結果

問題 No.1151 チャレンジゲーム
ユーザー daddy
提出日時 2023-02-15 23:46:36
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 897 ms / 2,000 ms
コード長 3,429 bytes
コンパイル時間 1,746 ms
コンパイル使用メモリ 180,412 KB
実行使用メモリ 16,512 KB
最終ジャッジ日時 2024-07-18 06:08:32
合計ジャッジ時間 26,509 ms
ジャッジサーバーID
(参考情報)
judge5 / judge3
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
sample AC * 3
other AC * 50
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

#pragma GCC optimization ("O3")
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vec = vector<ll>;
using mat = vector<vec>;
using pll = pair<ll,ll>;
#define INF (1LL<<61)
#define MOD 1000000007LL
//#define MOD 998244353LL
#define EPS (1e-10)
#define PR(x) cout << (x) << endl
#define PS(x) cout << (x) << " "
#define REP(i,m,n) for(ll (i)=(m),(i_len)=(n);(i)<(i_len);++(i))
#define FORE(i,v) for(auto (i):v)
#define ALL(x) (x).begin(), (x).end()
#define SZ(x) ((ll)(x).size())
#define REV(x) reverse(ALL((x)))
#define ASC(x) sort(ALL((x)))
#define DESC(x) {ASC((x)); REV((x));}
#define BIT(s,i) (((s)>>(i))&1)
#define pb push_back
#define fi first
#define se second
template<class T> inline int chmin(T& a, T b) {if(a>b) {a=b; return 1;} return 0;}
template<class T> inline int chmax(T& a, T b) {if(a<b) {a=b; return 1;} return 0;}
class mint {
public:
ll x;
mint(ll x=0) : x((x%MOD+MOD)%MOD) {}
mint operator-() const {return mint(-x);}
mint& operator+=(const mint& a) {if((x+=a.x)>=MOD) x-=MOD; return *this;}
mint& operator-=(const mint& a) {if((x+=MOD-a.x)>=MOD) x-=MOD; return *this;}
mint& operator*=(const mint& a) {(x*=a.x)%=MOD; return *this;}
mint operator+(const mint& a) const {mint b(*this); return b+=a;}
mint operator-(const mint& a) const {mint b(*this); return b-=a;}
mint operator*(const mint& a) const {mint b(*this); return b*=a;}
mint pow(ll t) const {if(!t) return 1; mint a=pow(t>>1); return (t&1?*this*a:a)*a;}
mint inv() const {return pow(MOD-2);}
mint& operator/=(const mint& a) {return *this*=a.inv();}
mint operator/(const mint& a) const {mint b(*this); return b/=a;}
};
istream &operator>>(istream& is, mint& a) {ll t; is>>t; a=t; return is;}
ostream &operator<<(ostream& os, const mint& a) {return os<<a.x;}
using mvec = vector<mint>;
using mmat = vector<mvec>;
using dvec = vector<double>;
using dmat = vector<dvec>;
ll N;
vec A;
map<vec,double> mp;
double solve(ll c, ll state, ll win)
{
vec tmp = {c, state, win};
if(mp.count(tmp)) return mp[tmp];
if(state == 0) {
ll s = 0, t = 0;
REP(i,0,N) {
if(BIT(win,i)) s += A[i];
else t += A[i];
}
if((c == 0 && s > t) || (c == 1 && s <= t)) return mp[tmp] = 1;
else return mp[tmp] = 0;
}
double res = 0;
REP(a,0,N) {
if(!BIT(state,a)) continue;
if(A[a] == 1) {
ll nw = win;
if(c == 0) nw ^= 1LL<<a;
chmax(res, 1-solve(c^1, state^(1LL<<a), nw));
continue;
}
double score = 1;
REP(b,0,N) {
if(!BIT(state,b)) continue;
double coef = (A[a]*A[b])/(double)(A[a]+A[b]-1);
double val = 0;
if(c == 0) {
val += coef*(1-solve(c^1, state^(1LL<<a), win^(1LL<<a)))/A[a];
val += coef*solve(c, state^(1LL<<b), win)*(A[a]-1)/A[a]/A[b];
}
else {
val += coef*(1-solve(c^1, state^(1LL<<a), win))/A[a];
val += coef*solve(c, state^(1LL<<b), win^(1LL<<b))*(A[a]-1)/A[a]/A[b];
}
chmin(score, val);
}
chmax(res, score);
}
return mp[tmp] = res;
}
int main()
{
cin >> N;
A = vec(N);
REP(i,0,N) cin >> A[i];
double ans = solve(0, (1LL<<N)-1, 0);
cout << setprecision(12) << ans << endl;
return 0;
}
/*
*/
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