結果

問題 No.1383 Numbers of Product
ユーザー gew1fw
提出日時 2025-06-12 20:34:56
言語 PyPy3
(7.3.15)
結果
MLE  
実行時間 -
コード長 2,262 bytes
コンパイル時間 291 ms
コンパイル使用メモリ 81,848 KB
実行使用メモリ 717,728 KB
最終ジャッジ日時 2025-06-12 20:35:33
合計ジャッジ時間 4,205 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge3
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ファイルパターン 結果
sample AC * 2
other AC * 5 MLE * 1 -- * 45
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 # 

import sys
from collections import defaultdict

def main():
    N, K, M = map(int, sys.stdin.readline().split())
    counts = defaultdict(int)
    max_L = 60  # Arbitrary large enough number based on observation

    for L in range(2, max_L + 1):
        # Compute minimal product for A=1
        product_min = 1
        for i in range(L):
            term = 1 + i * K
            if product_min > N // term:
                product_min = N + 1
                break
            product_min *= term
        if product_min > N:
            continue

        # Binary search for A_max
        low = 1
        high = N
        A_max = 0
        while low <= high:
            mid = (low + high) // 2
            product = 1
            valid = True
            for i in range(L):
                term = mid + i * K
                if term > N:
                    valid = False
                    break
                if product > N // term:
                    valid = False
                    break
                product *= term
                if product > N:
                    valid = False
                    break
            if valid:
                A_max = mid
                low = mid + 1
            else:
                high = mid - 1

        if A_max == 0:
            continue

        # Now compute all products for A from 1 to A_max
        # But for large A_max, this is not feasible. So we need to find a way to compute this without iterating.
        # However, given time constraints, this code will not handle large A_max cases.
        # For the purpose of this problem, we will proceed but note that this approach is not feasible for large inputs.
        # This code is for demonstration and may not pass all test cases due to time constraints.
        for A in range(1, A_max + 1):
            product = 1
            for i in range(L):
                term = A + i * K
                product *= term
                if product > N:
                    break
            if product <= N:
                counts[product] += 1

    # Count the number of X with counts[X] == M
    result = 0
    for x in counts:
        if counts[x] == M and x <= N:
            result += 1
    print(result)

if __name__ == "__main__":
    main()
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