Problem:
Search II

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

Elements in S is sorted in ascending order

n ≤ 100000

q ≤ 50000

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
1 2 3
1
5

Sample Output 2

0

Sample Input 3

5
1 1 2 2 3
2
1 2

Sample Output 3

2

Notes

Solution in C (judge verdict: Accepted)

#define N 100005
#define Q 50005
#include <stdio.h>
int S[N], T[Q];

//这里用二分查找算法，查找给定x是否在S中
int isExist(int x, int n) {
    int left = 0, right = n;
    while (left < right) {
        int mid = (left + right) / 2;
        if (x > S[mid]) {
            left = mid + 1;
        }
        else if (x < S[mid]) {
            right = mid;
        }
        else {
            return 1;
        }
    }
    return 0;
}

int main() {
    int cnt = 0;
    int n, q;
    scanf("%d", &n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &S[i]);
    }
    scanf("%d", &q);
    for (int i = 0; i < q; i++) {
        scanf("%d", &T[i]);
    }
    for (int i = 0; i < q; i++) {
        if (isExist(T[i], n)) {
            cnt++;
        }
    }
    printf("%d\n", cnt);
    return 0;
}