브루트 포스 https://www.acmicpc.net/problem/2231 분해합 https://www.acmicpc.net/problem/7568 https://www.acmicpc.net/problem/1018 https://www.acmicpc.net/problem/1436 정렬 https://www.acmicpc.net/problem/2750 https://www.acmicpc.net/problem/2751 수 정렬하기 2
