結果

問題 No.1682 Unfair Game
ユーザー Focus_SashFocus_Sash
提出日時 2021-09-17 22:31:45
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 3 ms / 2,000 ms
コード長 4,297 bytes
コンパイル時間 4,255 ms
コンパイル使用メモリ 262,704 KB
実行使用メモリ 5,376 KB
最終ジャッジ日時 2024-06-29 21:13:16
合計ジャッジ時間 4,493 ms
ジャッジサーバーID
(参考情報)
judge2 / judge5
このコードへのチャレンジ
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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 2 ms
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 2 ms
5,376 KB
testcase_04 AC 2 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 2 ms
5,376 KB
testcase_07 AC 2 ms
5,376 KB
testcase_08 AC 2 ms
5,376 KB
testcase_09 AC 2 ms
5,376 KB
testcase_10 AC 2 ms
5,376 KB
testcase_11 AC 2 ms
5,376 KB
testcase_12 AC 2 ms
5,376 KB
testcase_13 AC 3 ms
5,376 KB
testcase_14 AC 2 ms
5,376 KB
testcase_15 AC 2 ms
5,376 KB
testcase_16 AC 2 ms
5,376 KB
testcase_17 AC 2 ms
5,376 KB
testcase_18 AC 2 ms
5,376 KB
testcase_19 AC 2 ms
5,376 KB
testcase_20 AC 2 ms
5,376 KB
testcase_21 AC 2 ms
5,376 KB
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 #

#include "bits/stdc++.h"
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using vl = vector<long long>;
using pl = pair<long long, long long>;
struct edge {long long to;long long cost;edge(long long t,long long c):to(t),cost(c){}};
using Graph = vector<vector<long long>>;
using WGraph = vector<vector<edge>>;
constexpr int dx[8]{1,0,-1,0,1,1,-1,-1};
constexpr int dy[8]{0,1,0,-1,1,-1,1,-1};
#define rep(i, n) for(long long (i) = 0; (i) < (n); (i)++)
#define reps(i, a, b) for(long long (i) = (a); (i) < (b); (i)++)
#define rrep(i, a, b) for(long long (i) = (a); (i) >= (b); (i)--)
#define all(v) (v).begin(), (v).end()
#define pb push_back
#define V vector
constexpr long long MOD1 = 1000000007;
constexpr long long MOD9 =  998244353;
constexpr long long INF = numeric_limits<long long>::max() / 8;
constexpr long long LL_MAX = std::numeric_limits<long long>::max();
long long safe_mod(long long n, long long m){if(n >= 0) {return n % m;} else return (n%m + m)%m;}
long long pw(long long x,long long n) {ll ret=1;while(n>0){if(n&1){ret=ret*x;}if(n>>=1){x=x*x;}}return ret;}
template<typename T> T div_ceil(T a,T b){return (a - 1) / b + 1;}
template<typename T> T SUM(const vector<T> &v){T ret{};return(accumulate(v.begin(), v.end(), ret));}
template<typename T> T MAX(const vector<T> &v){return *max_element(v.begin(), v.end());}
template<typename T> T MIN(const vector<T> &v){return *min_element(v.begin(), v.end());}
template<typename T> T pwmod(T x, long long n, long long m) {T ret=1;while(n>0){if(n&1)ret=ret*x%m;x=x*x%m;n>>=1;}return ret%m;}
template<typename T> void rsort(vector<T> &v) {sort(v.begin(), v.end(), greater<T>());}
template<typename T> bool chmax(T &a, const T& b) {if(a<b){a=b;return true;}return false;}
template<typename T> bool chmin(T &a, const T& b) {if(a>b){a=b;return true;}return false;}
template<typename T, typename S> pair<T, S> mp(const T &a, const S &b){return make_pair(a, b);}
template<typename T> void uniquify(vector<T> &v){sort(v.begin(), v.end()); v.erase(unique(v.begin(), v.end()), v.end());}
template<typename T,typename S> ostream&operator<<(ostream&os,const pair<T,S>&p){os<<"("<<p.first<<", "<<p.second<<")";return os;}
template<typename T,typename S> ostream&operator<<(ostream&os,const map<T,S>&ma){for(auto [a,b]:ma){os<<"("<<a<<", "<<b<<")"<<" ";}return os;}
template<typename T> ostream &operator<<(ostream&os,const set<T>&s){os<<"{";for(auto c:s)os<<c<<" ";os<<"}";return os;}
template<typename T> ostream &operator<<(ostream&os,const vector<T>&v){os<<"[";for(int i=0;i<v.size();i++){os<<v[i]<<(i==v.size()-1?"":" ");}os<<"]";return os;}
template<typename T> vector<int> compress(vector<T> &a){
    int n = a.size(); vector<int> ret(n); vector<T> temp = a;
    sort(a.begin(), a.end()); a.erase(unique(a.begin(), a.end()), a.end());
    for(int i = 0; i < n; i++) ret[i] = lower_bound(a.begin(), a.end(), temp[i]) - a.begin();
    return ret;
}

//#define ONLINE_JUDGE
#ifdef ONLINE_JUDGE
#define dump(x) true
#else
#define dump(x) cerr << __LINE__ << " : " << #x << " = " << (x) << endl
#endif

using mint = modint1000000007;
std::istream &operator>>(std::istream& is, modint1000000007 &m){
    int a; is >> a; m = a;
    return is;
}
std::ostream &operator<<(std::ostream& os, const modint1000000007 &m){
    os << m.val();
    return os;
}
mint operator/(const mint &a, const mint &b){
    return a * b.inv();
}

const int MAX_N = 510;
mint fact[MAX_N], fact_inv[MAX_N];
void binom_init(){
    fact[0] = 1;
    fact_inv[0] = 1;
    for(int i = 1;i < MAX_N; i++){
        fact[i] = fact[i-1] * i;
        fact_inv[i] = fact[i].inv();
    }
}
mint binom(int n, int k){
    if(k < 0 || k > n) return 0;
    return fact[n] * fact_inv[n-k] * fact_inv[k];
}

void solve(){
    binom_init();
    ll n; cin >> n;
    ll pos = 0, neg = 0, z = 0;
    rep(i, n){
        ll p; cin >> p;
        if(p == 50){
            z++;
        } else if(p < 50){
            pos++;
        } else {
            neg++;
        }
    }
    mint ans = 0;
    for(ll i = 1; i <= neg; i += 2){
        ans += binom(neg, i) * mint(2).pow(pos);
    }
    cout << ans << '\n';
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << std::fixed << std::setprecision(15);

    solve();

    return 0;
}
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