結果
問題 |
No.766 金魚すくい
|
ユーザー |
![]() |
提出日時 | 2020-02-04 09:45:11 |
言語 | Python3 (3.13.1 + numpy 2.2.1 + scipy 1.14.1) |
結果 |
AC
|
実行時間 | 620 ms / 1,500 ms |
コード長 | 1,555 bytes |
コンパイル時間 | 209 ms |
コンパイル使用メモリ | 12,928 KB |
実行使用メモリ | 54,924 KB |
最終ジャッジ日時 | 2024-09-19 20:29:53 |
合計ジャッジ時間 | 26,050 ms |
ジャッジサーバーID (参考情報) |
judge1 / judge3 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 42 |
ソースコード
import sys read = sys.stdin.buffer.read readline = sys.stdin.buffer.readline readlines = sys.stdin.buffer.readlines import numpy as np MOD = 10**9 + 7 def cumprod(A, MOD = MOD): L = len(A); Lsq = int(L**.5+1) A = np.resize(A, Lsq**2).reshape(Lsq,Lsq) for n in range(1,Lsq): A[:,n] *= A[:,n-1]; A[:,n] %= MOD for n in range(1,Lsq): A[n] *= A[n-1,-1]; A[n] %= MOD return A.ravel()[:L] def make_fact(U, MOD = MOD): x = np.arange(U, dtype = np.int64); x[0] = 1 fact = cumprod(x, MOD) x = np.arange(U, 0, -1, dtype=np.int64); x[0] = pow(int(fact[-1]), MOD-2, MOD) fact_inv = cumprod(x, MOD)[::-1] fact.flags.writeable = False fact_inv.flags.writeable = False return fact,fact_inv def make_power(a, L, MOD=MOD): B = L.bit_length() x = np.empty((1<<B), np.int64) x[0] = 1 for n in range(B): x[1<<n:1<<(n+1)] = x[:1<<n] * a % MOD a *= a; a %= MOD x = x[:L] x.flags.writeable = False return x N, M, P = map(int, readline().split()) V = np.fromstring(read(), np.int64, sep=' ') fact, fact_inv = make_fact(N + M) P *= pow(100, MOD-2, MOD) Q = 1 - P P %= MOD Q %= MOD power_Q = make_power(Q, N+M) comb = fact[M-1:N+M-1] * fact_inv[0:N] % MOD * fact_inv[M-1] % MOD prob = np.empty(N+1, dtype=np.int64) prob[:N] = comb * power_Q[:N] % MOD * pow(P, M, MOD) % MOD prob[-1] = (1 - prob[:-1].sum()) % MOD V.sort() V = V[::-1] Vcum = np.empty(N+1, np.int64) Vcum[0] = 0 Vcum[1:] = V.cumsum() % MOD answer = (Vcum * prob % MOD).sum() % MOD print(answer)