题解 | #截取字符串#
截取字符串
http://www.nowcoder.com/practice/a30bbc1a0aca4c27b86dd88868de4a4a
#include<bits/stdc++.h>
using namespace std;
int main () {
string str;
int n;
while(cin>>str>>n) {
cout<<str.substr(0,n)<<endl; //截取字符串[0,n)位，长度为n的字符串
}
return 0;
} 
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