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)

#include <stdio.h>

int A[1000000], n;

//二分探索
int binarySearch(int key){
  int left=0;
  int right=n;
  int mid;

  while(left < right)
  {
    mid=(left+right)/2;

    if(key == A[mid])
      return 1;
    if(key > A[mid])
      left=mid+1;
    else if(key < A[mid])
      right=mid;
  }

  return 0;
}

int main(){
  int i, q, k, sum=0;

  scanf("%d", &n);
  for(i=0; i<n; i++)
  {
    scanf("%d", &A[i]);
  }

  scanf("%d", &q);
  for(i=0; i<q; i++)
  {
    scanf("%d", &k);
    if(binarySearch(k))
      sum++;
  }
  printf("%d\n", sum);

  return 0;
}