[백준] 2790 F7 - Greedy / Java

• 문제 링크

2790번: F7

 

• 풀이 과정

 

• 풀이 코드

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.Arrays;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));

        int n = Integer.parseInt(br.readLine());

        int[] arr = new int[n];
        for (int i = 0; i < n; i++)
            arr[i] = Integer.parseInt(br.readLine());

        Arrays.sort(arr);

        int score = arr[n - 1], cnt = 1;
        for (int i = n - 2; i >= 0; i--) {
            if (arr[i] + n < score)
                break;

            cnt++;
            score = Math.max(score, arr[i] + n - i);
        }

        bw.write(String.valueOf(cnt));
        bw.flush();
    }

}