题解 | #截取字符串#

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

int main()
{
    string str;
    int num;
    while(cin>>str>>num)
    {
        //huibuhuiyuejie
        for(int i=0; i<num; i++)
        {
            cout<<str[i];
        }
        cout<<endl;
    }
    return 0;
}