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: Time Limit Exceeded)

#include<stdio.h>

int main(){
  int n,q,i,j,count=0,true_count=0,left,right,mid;
  scanf("%d",&n);
  int A[n+1];
  for(i=0;i<n;i++){
    scanf("%d",&A[i]);
  }
  scanf("%d",&q);
  int B[q+1];
  for(i=0;i<q;i++){
    scanf("%d",&B[i]);
  }
  // 一致するかどうか調べる
  left=0;
  right=n;
    for(i=0;i<n;i++){
        mid=(left+right)/2;
        while(left<right){
            if(A[mid]==B[i]){
                count++;
                return mid;
            }
            else if(B[i]<A[mid]) right=mid;
            else left=mid+1;
        }
    }
  // -------------------
  printf("%d\n",count);
  return 0;
}