結果
問題 | No.1151 チャレンジゲーム |
ユーザー |
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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 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 50 |
ソースコード
#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; } /* */