1. (KOI 2006 지역본선 초등부 5번) 스도쿠: https://www.acmicpc.net/problem/2580
2. (SEERC 2005 C번) Sudoku: https://www.acmicpc.net/problem/2239
3. (SEERC 2006 A번) Sudoku: https://www.acmicpc.net/problem/3763
4. (New York Regional 2016 C번) Tight-Fit Sudoku: https://www.acmicpc.net/problem/13882
5. (USACO November 2011 Gold 2번) Binary Sudoku: https://www.acmicpc.net/problem/5923
항상 그렇듯이 5번이 진짜배기임
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