초급) 1850 : ABC정렬(ABC sort) : http://jungol.co.kr/bbs/board.php?bo_table=pbank&wr_id=1123&sca=99 더보기 https://thinkmath2020.tistory.com/1088 초급) 백준21756 지우개 : https://www.acmicpc.net/problem/21756 더보기 https://thinkmath2020.tistory.com/1103?category=941877 초급) 1893: 구역의 합 : http://jungol.co.kr/bbs/board.php?bo_table=pbank&wr_id=1166&sca=99&page=9 더보기 https://thinkmath2020.tistory.com/1116 초급) 1531번..