设哈希表表长为20，用除留余数法构造一个哈希函数，以开放地址法中的线性探测再散列法作为解决冲突的方法，编程实现哈希表查找、插入和建立算法。(The set hash table length is 20. The algorithm of hash lookup, insert and build the hash table is programmed by using the exclusion residue method to construct a hash function and the linear detection and rehash method in the open address method as a solution to the conflict)