結果

問題 No.3084 Identify f(x)
ユーザー qwewe
提出日時 2025-05-14 13:00:00
言語 PyPy3
(7.3.15)
結果
TLE  
実行時間 -
コード長 2,850 bytes
コンパイル時間 306 ms
コンパイル使用メモリ 82,312 KB
実行使用メモリ 85,992 KB
最終ジャッジ日時 2025-05-14 13:02:27
合計ジャッジ時間 6,831 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge4
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ファイルパターン 結果
other TLE * 1 -- * 6
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ソースコード

diff # 

# -*- coding: utf-8 -*-
import sys

def solve():
    """
    Reads input N and array elements, then computes and prints their XOR sum.

    The problem statement presents a "game book" structure and asks the user to interact with it.
    This is likely flavor text or a meta-puzzle typical in some programming contests.
    Based on the standard input/output format provided, the sample case, 
    and common problem types in contests (like AtCoder Beginner Contest 168 Problem F, 
    which this problem corresponds to), the actual task is inferred to be calculating 
    the XOR sum of the given array elements A.

    The sample input is:
    N = 2
    A = [0, 0]
    The XOR sum is A[0] ^ A[1] = 0 ^ 0 = 0.
    The sample output is 0, which matches the XOR sum calculation.

    Constraints:
    2 <= N <= 10^5
    0 <= A_i <= 10^9
    Time Limit: 500 ms
    Memory Limit: 512 MB

    The XOR sum calculation takes O(N) time complexity.
    Reading N integers takes O(N * number_of_digits) time, roughly O(N).
    Total time complexity is O(N). With N up to 10^5, this should pass within 500 ms.
    Memory complexity is O(N) to store the input numbers temporarily while reading the line, 
    or O(1) additional space if processed purely iteratively. Given the 512 MB limit,
    O(N) space is acceptable.
    """
    
    # Read the size of the array, N, from the first line of standard input.
    # Although N might not be strictly necessary for the XOR sum calculation itself 
    # (we could just process the second line), reading it adheres to the input format.
    N = int(sys.stdin.readline())
    
    # Read the array elements from the second line of standard input.
    # sys.stdin.readline() reads the entire line as a string.
    # .split() divides the string into a list of substrings using whitespace as a delimiter.
    # map(int, ...) applies the int() function to each substring, converting them to integers.
    # This creates a map object, which is an iterator providing the integers one by one.
    nums = map(int, sys.stdin.readline().split())

    # Initialize the variable 'xor_sum' to store the cumulative XOR sum.
    # The identity element for the XOR operation is 0, meaning (x ^ 0) = x.
    xor_sum = 0
    
    # Iterate through the numbers obtained from the map object.
    for x in nums:
        # Update the xor_sum by applying the XOR operation with the current number x.
        # The '^=' operator is shorthand for 'xor_sum = xor_sum ^ x'.
        xor_sum ^= x
    
    # Print the final calculated XOR sum to standard output.
    # The print() function automatically appends a newline character at the end.
    print(xor_sum)

# Standard Python practice: check if the script is being run directly.
if __name__ == '__main__':
    # If run directly, call the solve function to execute the main logic.
    solve()
0