백준) 1449_수리공 항승

https://www.acmicpc.net/problem/1449

1449번: 수리공 항승

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;
 
public class Main {
 
    public static void main(String[] args) throws IOException {
 
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
 
        int N = Integer.parseInt(st.nextToken());
        int L = Integer.parseInt(st.nextToken());
        int[] arr = new int[N];
        int result = 0;
 
        st = new StringTokenizer(br.readLine());
 
        for (int i = 0; i < N; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }
 
        Arrays.sort(arr);
        
        for (int i = 0; i < N; i++) {
            int cnt = 0;
            result+=1;
            for (int j = i + 1; j < N; j++) {
                if (arr[j] - arr[i] < L) {
                    cnt++;
                }
            }
            i += cnt;
        }
        System.out.println(result);
    }
}