解题思路:
(1)substr
#include<iostream>
using namespace std;
int main() {
int n;
string s;
while(cin>>s) {
cin>>n;
cout<<s.substr(0,n)<<endl;
}
return 0;
}
解题思路:
(1)substr
#include<iostream>
using namespace std;
int main() {
int n;
string s;
while(cin>>s) {
cin>>n;
cout<<s.substr(0,n)<<endl;
}
return 0;
}