AC了

#include<iostream>
using namespace std;
int main()
{
    string str1, str2;
    cin >> str1 >> str2;
    int lenth = str1.length();  //求解字符串长度，防止非法访问
    long sum = 1;
    for (int i = 1; i < lenth; i++)
    {
        for (int j = 0; j < lenth - 1; j++)
        {
            if (str1[i] == str2[j] && str1[i - 1] == str2[j + 1]) sum *= 2; //找到一个单子叶节点，总数乘以2
        }    
    }
    cout << sum << endl;
    return 0;
}