题解 | 复读机

import sys


lines = sys.stdin.read().splitlines()

result = []
for line in lines:
    stripped = line.strip()
    if not stripped:
        result.append(stripped) # 保留空行
        continue

    try:
        num = float(stripped)
        if num.is_integer():
            result.append(stripped)
            continue

        value = format(num, ".1f")
        result.append(value)
        continue
    except Exception as e:
        pass
    result.append(stripped)
print("\n".join(result))