codeforces 1453 A.Cancel the Trains
思路分析：
经典签到题，最后的意思大概是，横纵出发的号一样的话，才会相撞
AC代码：
#include <bits/stdc++.h>
using namespace std;
const int N = 110;
int a[N];
int main() {
int t;
cin >> t;
while (t--) {
int n, m;
cin >> n >> m;
int res = 0;
int num;
for (int i = 0; i < n; i++)
cin >> a[i];
while (m--) {
cin >> num;
for (int i = 0; i < n; i++)
if(num == a[i]) {
res++;
break;
}
}
cout << res << endl;
}
return 0;
}