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                [SCOI2007]修车                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p>　　同一时刻有N位车主带着他们的爱车来到了汽车维修中心。维修中心共有M位技术人员，不同的技术人员对不同<br />
的车进行维修所用的时间是不同的。现在需要安排这M位技术人员所维修的车及顺序，使得顾客平均等待的时间最<br />
小。 说明：顾客的等待时间是指从他把车送至维修中心到维修完毕所用的时间。</p></p><hr/><h3>输入格式</h3><p><p>　　第一行有两个m,n，表示技术人员数与顾客数。 接下来n行，每行m个整数。第i+1行第j个数表示第j位技术人<br />
员维修第i辆车需要用的时间T。</p></p><hr/><h3>输出格式</h3><p><p>　　最小平均等待时间，答案精确到小数点后2位。</p></p><hr/><h3>样例输入</h3><pre>2 2
3 2
1 4</pre><hr/><h3>样例输出</h3><pre>1.50</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium">数据范围: (2&lt;=M&lt;=9,1&lt;=N&lt;=60), (1&lt;=T&lt;=1000)</span></p></p><hr/><h3>题目来源</h3><p>没有写明来源</p>
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