题解 | #截取字符串#
截取字符串
https://www.nowcoder.com/practice/a30bbc1a0aca4c27b86dd88868de4a4a
use std::io::{self, *};
fn main() {
let stdin = io::stdin();
let mut input = String::new();
stdin.read_line(&mut input).unwrap();
let mut num = String::new();
stdin.read_line(&mut num).unwrap();
let num = num.trim().parse::<usize>().unwrap();
input.truncate(num);
println!("{}",input);
}
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