100GB URL文件，1GB内存，求出TOP100的URL。
1.将100GB文件过于大，超出了1GB的内存，所以将大文件分成若干小文件。
2.每个小文件进行排序，求出前100的URL。（使用TreeMap）
3.最后合并求出TOP100的URL。
当存在多个hash相等的URL时，会存在多个URL都要存在同一个小文件，造成超过1GB内存的情况。
利用解决hash冲突方法，Hi=（H（key）+di）% m，用再散列的函数来求一个新的hash值。让所有url分布均匀。
输入集：
1.大部分URL都分布均匀。
2.大部分的URL都hash值一样。
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