백준 1449 java

import java.util.Collections;
import java.util.Scanner;
import java.util.Vector;

public class bj1449 {
    static Scanner scanner = new Scanner(System.in);

    public static Vector<Integer> inputData(int N)
    {
        int i, num;
        Vector<Integer> data = new Vector<>();

        for(i = 0; i < N; i++)
        {
            num = scanner.nextInt();
            data.add(num);
        }
        Collections.sort(data);

        return data;
    }

    public static void findAnswer(Vector<Integer> pipe, int N, int L)
    {
        int i;
        int min = 0;
        int current;
        int tape = 0;

        for(i = 0; i < pipe.size(); i++)
        {
            current = pipe.get(i);
            if(current > tape)
            {
                tape = current + L - 1;
                min++;
            }
        }
        System.out.println(min);
    }

    public static void main(String[] args) {
        int N, L;
        Vector<Integer> pipe;

        N = scanner.nextInt();
        L = scanner.nextInt();
        pipe = inputData(N);
        findAnswer(pipe, N, L);

        scanner.close();
    }
}