結果
| 問題 | No.822 Bitwise AND | 
| コンテスト | |
| ユーザー |  lam6er | 
| 提出日時 | 2025-04-15 23:06:26 | 
| 言語 | PyPy3 (7.3.15) | 
| 結果 | 
                                WA
                                 
                             | 
| 実行時間 | - | 
| コード長 | 1,739 bytes | 
| コンパイル時間 | 461 ms | 
| コンパイル使用メモリ | 81,592 KB | 
| 実行使用メモリ | 270,776 KB | 
| 最終ジャッジ日時 | 2025-04-15 23:08:34 | 
| 合計ジャッジ時間 | 3,913 ms | 
| ジャッジサーバーID (参考情報) | judge3 / judge4 | 
(要ログイン)
| ファイルパターン | 結果 | 
|---|---|
| other | AC * 8 WA * 9 | 
ソースコード
def main():
    import sys
    N, K = map(int, sys.stdin.readline().split())
    
    if N == 0:
        if K == 0:
            print(1)
        else:
            print("INF")
        return
    
    if K == 0:
        print(1)
        return
    
    # Check if N has two consecutive ones in binary representation
    has_consecutive_ones = False
    prev_one = False
    n = N
    while n > 0:
        bit = n & 1
        if bit == 1:
            if prev_one:
                has_consecutive_ones = True
                break
            prev_one = True
        else:
            prev_one = False
        n >>= 1
    
    if has_consecutive_ones:
        print("INF")
        return
    
    # Collect all bits in S (complement of N)
    bits = []
    m = 0
    while True:
        bit = 1 << m
        if (N & bit) == 0:
            bits.append(bit)
        m += 1
        if bit > N * 2 and m > 20:  # Heuristic to limit bits considered
            break
    
    # Dynamic Programming to count valid pairs
    from collections import defaultdict
    dp = defaultdict(int)
    dp[0] = 1
    
    for bit in bits:
        new_dp = defaultdict(int)
        for diff in dp:
            cnt = dp[diff]
            # Option 1: ignore the bit
            new_dp[diff] += cnt
            # Option 2: add to a (subtract bit)
            new_diff = diff - bit
            new_dp[new_diff] += cnt
            # Option 3: add to b (add bit, if within K)
            new_diff_add = diff + bit
            if new_diff_add <= K:
                new_dp[new_diff_add] += cnt
        dp = new_dp
    
    total = 0
    for diff in dp:
        if 0 <= diff <= K:
            total += dp[diff]
    
    print(total)
if __name__ == "__main__":
    main()
            
            
            
        