完全竞争市场特征判断

def solve(market_features):
    required = ["大量买卖双方", "产品同质", "自由进出", "信息完全"]
    met = [f for f in market_features if f in required]
    is_perfect = len(met) == len(required)
    return {"市场特征": market_features, "满足条件数": len(met), "是完全竞争市场": is_perfect}