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Linear Search

AOJ 站点默认 11个月前 (04-09) 663次浏览 已收录 60个评论
文章目录[隐藏]

Question

You are given a sequence of n integers S and a sequence of different q integers T. Write a program which outputs C, the number of integers in T which are also in the set S.

Input
In the first line n is given. In the second line, n integers are given. In the third line q is given. Then, in the fourth line, q integers are given.

Output
Print C in a line.

Constraints
n ≤ 10000
q ≤ 500
0 ≤ an element in S ≤ 109
0 ≤ an element in T ≤ 109
Sample Input 1
5
1 2 3 4 5
3
3 4 1
Sample Output 1
3
Sample Input 2
3
3 1 2
1
5
Sample Output 2
0
Sample Input 3
5
1 1 2 2 3
2
1 2
Sample Output 3
2
Notes

Meaning

题目很简单,但是这里主要讲一个:线性搜索在引入标记之后,效率能提升常数倍。

Coding

Summary


向线性搜索种引入“标记”能够以将算法效率提升常数倍。
原始:

改进后,给要查找的数放在数组末尾,用作标记。


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