题解 | #截取字符串#

#include <iostream>
#include <string>
using namespace std;

int main ()
{
    string s;
    int n;
    while (cin>>s)//为什么这行可以。下面这行就不行？
    //while(scanf("%s",&s)!=EOF)//为什么写这行就不行？
    {
        cin>>n;
        //cout<<s<<" "<<n;
        for (int i=0;i<n;i++)
        {
            cout<<s[i];
        }
        cout<<endl;

    }

}