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 main(){

  int n,q,i,cnt=0,a,b,c;

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

  a=0;
  c=n;
  for(i=0;i<q;i++){
    while(a<c){
      b=(a+c)/2;
      if(A[b]==B[i]){
	cnt++;
	break;
      }
      else if(B[i]<A[b]) c=b;
      else a=b+1;
    }
    a=0;
    c=n;
  }

  printf("%d\n",cnt);

    return 0;
  
}