[Baekjoon Online Judge] 2309 - 일곱 난쟁이 / Java

https://www.acmicpc.net/problem/2309

2309번: 일곱 난쟁이

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main {
	static int[] arr, isSelected;

	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		arr = new int[9];
		isSelected = new int[7];
		for (int i = 0; i < 9; i++) {
			arr[i] = Integer.parseInt(br.readLine());
		}

		combination(0, 0);
	}

	public static void combination(int cnt, int start) {
		if (cnt == 7) {
			int sum = 0;
			for (int i = 0; i < 7; i++) {
				sum += isSelected[i];
			}
			if (sum == 100) {
				Arrays.sort(isSelected);
				for (int i = 0; i < 7; i++) {
					System.out.println(isSelected[i]);
				}
				return;
			}
			return;
		}

		for (int i = start; i < 9; i++) {
			isSelected[cnt] = arr[i];
			combination(cnt + 1, i + 1);
		}
	}
}