๐จ ์ฐธ๊ณ ์ฝ๋
์ฝ๋
const fs = require('fs');
const input = fs.readFileSync('/dev/stdin').toString().trim().split('\n');
const [N, K] = input[0].split(" ").map(Number);
const students = input[1].split(" ").map(Number);
const arr = [];
for (let i = 0; i < N - 1; i++) {
arr.push(students[i + 1] - students[i]);
}
arr.sort((a, b) => a - b);
let answer = 0;
for (let i = 0; i < N - 1 - (K - 1); i++) {
answer += arr[i];
}
console.log(answer);