洛谷题目:计算得分求助

def main():
    n, m = map(int, input().split())
    players = []
    for _ in range(n):
        reg_num, score = map(int, input().split())
        players.append((reg_num, score))

    # 按照第一轮成绩从高到低排序，成绩相同按照报名号由小到大排序
    players.sort(key=lambda x: (-x[1], x[0]))

    # 计算进入第二轮的分数线
    second_round_score = players[m-1][1]
    
    # 找出所有第一轮成绩不低于第二轮分数线的选手
    qualified_players = [player for player in players if player[1] >= second_round_score]

    # 输出结果
    print(second_round_score, len(qualified_players))
    for player in qualified_players:
        print(player[0], player[1])

if __name__ == "__main__":
    main()