結果
| 問題 |
No.1238 選抜クラス
|
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2020-09-26 18:00:39 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 20 ms / 2,000 ms |
| コード長 | 2,900 bytes |
| コンパイル時間 | 1,633 ms |
| コンパイル使用メモリ | 172,240 KB |
| 実行使用メモリ | 19,584 KB |
| 最終ジャッジ日時 | 2024-06-29 12:31:42 |
| 合計ジャッジ時間 | 2,882 ms |
|
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 36 |
ソースコード
#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL_
void debug_out() {cerr << endl;}
template<typename Head,typename... Tail> void debug_out(Head H,Tail... T){cerr << ' ' << H; debug_out(T...);}
#define debug(...) cerr << 'L' << __LINE__ << " [" << #__VA_ARGS__ << "]:",debug_out(__VA_ARGS__)
#define dump(x) cerr << 'L' << __LINE__ << " " << #x << " = " << (x) << endl;
#else
#define debug(...) (void(0))
#define dump(x) (void(0))
#endif
#define rep(i,n) for (int i = 0; i < (int)(n); i ++)
#define irep(i,n) for (int i = (int)(n) - 1;i >= 0;--i)
using ll = long long;
using PL = pair<ll,ll>;
using P = pair<int,int>;
constexpr int INF = 1000000000;
constexpr long long HINF = 1000000000000000;
constexpr long long MOD = 1000000007;// = 998244353;
constexpr double EPS = 1e-4;
constexpr double PI = 3.14159265358979;
template<int Modulus>
struct ModInt {
long long x;
ModInt(long long x = 0) :x((x%Modulus + Modulus)%Modulus) {}
constexpr ModInt &operator+=(const ModInt a) {if ((x += a.x) >= Modulus) x -= Modulus; return *this;}
constexpr ModInt &operator-=(const ModInt a) {if ((x += Modulus - a.x) >= Modulus) x -= Modulus; return *this;}
constexpr ModInt &operator*=(const ModInt a) {(x *= a.x) %= Modulus; return *this;}
constexpr ModInt &operator/=(const ModInt a) {return *this *= a.inverse();}
constexpr ModInt operator+(const ModInt a) const {return ModInt(*this) += a.x;}
constexpr ModInt operator-(const ModInt a) const {return ModInt(*this) -= a.x;}
constexpr ModInt operator*(const ModInt a) const {return ModInt(*this) *= a.x;}
constexpr ModInt operator/(const ModInt a) const {return ModInt(*this) /= a.x;}
friend constexpr ostream& operator<<(ostream& os,const ModInt<Modulus>& a) {return os << a.x;}
friend constexpr istream& operator>>(istream& is,ModInt<Modulus>& a) {return is >> a.x;}
ModInt inverse() const {// x ^ (-1)
long long a = x,b = Modulus,p = 1,q = 0;
while (b) {long long d = a/b; a -= d*b; swap(a,b); p -= d*q; swap(p,q);}
return ModInt(p);
}
ModInt pow(long long N) {// x ^ N
ModInt a = 1;
while (N) {
if (N&1) a *= *this;
*this *= *this;
N >>= 1;
}
return a;
}
};
using mint = ModInt<1000000007>;
const int MAX = 10010;
int main() {
cin.tie(nullptr);
ios::sync_with_stdio(false);
int N,K; cin >> N >> K;
vector<int> A(N);
rep(i,N) {
cin >> A[i];
A[i] -= K;
}
vector<vector<mint>> dp(N + 1,vector<mint>(2*MAX,0));
dp[0][MAX] = 1;
rep(i,N) {
rep(j,2*MAX) {
dp[i + 1][j] += dp[i][j];
if (j - A[i] >= 0 && j - A[i] < 2*MAX) dp[i + 1][j] += dp[i][j - A[i]];
}
}
mint ans = 0;
for (int i = MAX;i < 2*MAX; ++i) ans += dp[N][i];
ans -= 1;
cout << ans << '\n';
return 0;
}