結果
| 問題 | No.3038 シャッフルの再現 |
| コンテスト | |
| ユーザー |
lam6er
|
| 提出日時 | 2025-03-31 17:33:32 |
| 言語 | PyPy3 (7.3.15) |
| 結果 |
RE
|
| 実行時間 | - |
| コード長 | 2,128 bytes |
| 記録 | |
| コンパイル時間 | 206 ms |
| コンパイル使用メモリ | 82,400 KB |
| 実行使用メモリ | 67,760 KB |
| 最終ジャッジ日時 | 2025-03-31 17:34:12 |
| 合計ジャッジ時間 | 2,374 ms |
|
ジャッジサーバーID (参考情報) |
judge2 / judge5 |
(要ログイン)
| ファイルパターン | 結果 |
|---|---|
| sample | RE * 1 |
| other | RE * 21 |
ソースコード
import sys
MOD = 10**9 + 7
def fast_doubling(n, p):
if n == 0:
return (0, 1)
a, b = fast_doubling(n >> 1, p)
c = (a * ((2 * b - a) % p)) % p
d = (a * a + b * b) % p
if n & 1:
return (d, (c + d) % p)
else:
return (c, d)
def check_pisano(d, p):
if d == 0:
return False
a, b = fast_doubling(d, p)
return (a % p == 0) and (b % p == 1)
def factor(n):
factors = {}
while n % 2 == 0:
factors[2] = factors.get(2, 0) + 1
n //= 2
i = 3
while i * i <= n:
while n % i == 0:
factors[i] = factors.get(i, 0) + 1
n //= i
i += 2
if n > 1:
factors[n] = 1
return factors
def generate_divisors(factors):
divisors = [1]
for p, exp in factors.items():
temp = []
for d in divisors:
current = 1
for _ in range(exp + 1):
temp.append(d * current)
current *= p
divisors = temp
return divisors
def compute_period_pisano(p):
if p == 2:
return 3
if p == 5:
return 20
legendre = pow(5, (p - 1) // 2, p)
if legendre == 1 or legendre == 0:
target = p - 1
else:
target = 2 * (p + 1)
factors = factor(target)
divisors = generate_divisors(factors)
divisors = sorted(divisors)
for d in divisors:
if d == 0:
continue
if check_pisano(d, p):
return d
return target
def lcm(a, b):
from math import gcd
return a * b // gcd(a, b)
def main():
input = sys.stdin.read().split()
idx = 0
N = int(input[idx])
idx += 1
current_lcm = 1
for _ in range(N):
p = int(input[idx])
k = int(input[idx + 1])
idx += 2
if p == 2:
pe_pisano = 3 * (2 ** (k - 1))
elif p == 5:
pe_pisano = 20 * (5 ** (k - 1))
else:
pi_p = compute_period_pisano(p)
pe_pisano = pi_p * (p ** (k - 1))
current_lcm = lcm(current_lcm, pe_pisano)
print(current_lcm % MOD)
if __name__ == '__main__':
main()
lam6er