結果

問題 No.3067 +10 Seconds Clock
ユーザー qwewe
提出日時 2025-05-14 13:18:42
言語 PyPy3
(7.3.15)
結果
WA  
実行時間 -
コード長 3,362 bytes
コンパイル時間 256 ms
コンパイル使用メモリ 82,812 KB
実行使用メモリ 54,140 KB
最終ジャッジ日時 2025-05-14 13:19:33
合計ジャッジ時間 2,557 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
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ファイルパターン 結果
sample WA * 3
other WA * 23
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

def solve():
    """
    Reads input N and array A, then calculates and prints the answer.
    
    The problem description is incomplete in the prompt. Based on the 
    single provided example (Input: N=5, A=[1, 2, 3, 4, 5], Output: 2), 
    this solution assumes the task is to count the number of even integers 
    in the array A. There are two even numbers (2 and 4) in the example array, 
    matching the output 2.
    
    Other interpretations might be possible if the full problem statement 
    differs, but this is the most straightforward interpretation fitting 
    the example.
    """
    
    # Read the integer N (size of the array) from the first line of input.
    # Using sys.stdin.readline() is generally faster than input() for large inputs.
    try:
        n = int(sys.stdin.readline())
    except ValueError:
        # Handle potential error if the first line is not a valid integer
        print("Error: Invalid input for N.", file=sys.stderr)
        return
    except EOFError:
        print("Error: Reached end of file while reading N.", file=sys.stderr)
        return

    # Read the list of N integers A from the second line of input.
    # map(int, ...) applies the int() function to each element after splitting the line.
    # list(...) converts the map object into a list.
    try:
        line = sys.stdin.readline()
        if line == "": # Check for empty line / EOF
            print("Error: Reached end of file while reading array A.", file=sys.stderr)
            return
        
        a = list(map(int, line.split()))
        
        # Verify that the number of elements read matches N.
        if len(a) != n:
             # This check is helpful for debugging but might not be necessary in typical contest settings
             # where input format is guaranteed.
             # print(f"Error: Expected {n} elements, but found {len(a)}.", file=sys.stderr)
             # Decide whether to proceed or exit based on contest rules/expectations.
             # For robustness, we could potentially handle this, but typically N is correct.
             pass # Assuming N is correct per standard contest problem formats
             
    except ValueError:
        # Handle potential error if the second line contains non-integer values.
        print("Error: Invalid input in array A. Contains non-integer values.", file=sys.stderr)
        return
    except EOFError:
         print("Error: Reached end of file unexpectedly while reading array A.", file=sys.stderr)
         return


    # Initialize a counter variable to store the count of even numbers.
    even_count = 0
    
    # Iterate through each element `x` in the list `a`.
    for x in a:
        # Check if the element `x` is even.
        # An integer `x` is even if its remainder when divided by 2 is 0.
        # That is, `x % 2 == 0`.
        if x % 2 == 0:
            # If `x` is even, increment the counter.
            even_count += 1
    
    # Print the final count to standard output.
    # The print() function in Python 3 automatically adds a newline character at the end.
    print(even_count)

# Execute the solve function when the script is run.
# The `if __name__ == '__main__':` block ensures this code runs only when the script
# is executed directly, not when imported as a module.
if __name__ == '__main__':
    solve()
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