Problem:
Score : 200 points

Problem Statement

Snuke has N sticks.
The length of the i-th stick is l_i.

Snuke is making a snake toy by joining K of the sticks together.

The length of the toy is represented by the sum of the individual sticks that compose it.
Find the maximum possible length of the toy.

Constraints

1 \leq K \leq N \leq 50

1 \leq l_i \leq 50

l_i is an integer.

Input

Input is given from Standard Input in the following format:

N K
l_1 l_2 l_3 ... l_{N}

Output

Print the answer.

Sample Input 1

5 3
1 2 3 4 5

Sample Output 1

12

You can make a toy of length 12 by joining the sticks of lengths 3, 4 and 5, which is the maximum possible length.

Sample Input 2

15 14
50 26 27 21 41 7 42 35 7 5 5 36 39 1 45

Sample Output 2

386

Solution in Rust (1.15.1) (judge verdict: Accepted)

use std::io;

fn get_line() -> String {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    input
}

fn main() {
    let hoge = get_line();
    let fuga = get_line();
    let nk: Vec<usize> = hoge.trim().split(" ").map(|x| x.parse().unwrap()).collect();
    let mut ls: Vec<u32> = fuga.trim().split(" ").map(|x| x.parse().unwrap()).collect();
    ls.sort_by(|a, b| b.cmp(a));
    println!("{}", ls[0..nk[1]].iter().sum::<u32>());
}