最长公共字串：字符串截取，查找

include<bits/stdc++.h>

using namespace std;

int main()
{
string a ,b ,c;
cin >> a >>b;
int len =0 ;

for(int i=0;i<a.length();i++)
{
    for(int j=a.length()-i; j>=2;j--)
    {
        if(b.find(a.substr(i,j)) != -1  &&  a.substr(i,j).length() >= len)
        {
            len = a.substr(i,j).length() ;
        }
    }
}
cout << len <<endl;

return 0;

}