题解 | #截取字符串#

#include <iostream>
#include <string>

using namespace std;

int main()
{
    string strIn;
    int n;
    while(cin>>strIn>>n) {
        string strOut;
        for(int i = 0; i < n; i++) {
            strOut += strIn[i];
        }
        cout<<strOut<<endl;
    }
}