結果
問題 |
No.1322 Totient Bound
|
ユーザー |
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提出日時 | 2025-04-15 22:33:01 |
言語 | PyPy3 (7.3.15) |
結果 |
TLE
|
実行時間 | - |
コード長 | 1,648 bytes |
コンパイル時間 | 170 ms |
コンパイル使用メモリ | 82,636 KB |
実行使用メモリ | 66,416 KB |
最終ジャッジ日時 | 2025-04-15 22:35:13 |
合計ジャッジ時間 | 7,448 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 10 TLE * 1 -- * 25 |
ソースコード
def is_prime(n): if n < 2: return False for p in [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37]: if n % p == 0: return n == p d = n - 1 s = 0 while d % 2 == 0: d //= 2 s += 1 for a in [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37]: if a >= n: continue x = pow(a, d, n) if x == 1 or x == n - 1: continue for _ in range(s - 1): x = pow(x, 2, n) if x == n - 1: break else: return False return True def count_totient_bound(N): count = 0 stack = [] stack.append((0, 1, 1)) # (last_p, product_p_minus_1, current_phi) while stack: last_p, product_p_minus_1, current_phi = stack.pop() count += 1 R = N // current_phi p = last_p + 1 while True: if product_p_minus_1 * (p - 1) > N: break if p > R + 1: break if is_prime(p): contribution = (p - 1) total_contribution = contribution k = 1 while True: if current_phi * total_contribution > N: break new_product_p_minus_1 = product_p_minus_1 * (p - 1) new_phi = current_phi * total_contribution stack.append((p, new_product_p_minus_1, new_phi)) total_contribution *= p k += 1 p += 1 return count # Read input and output the result N = int(input()) print(count_totient_bound(N))