번호	제목
11826	Black-and-white Square
11827	King’s Walk
11828	High Jump
11829	Fans
11830	Star triangles
11831	Hyper-minimum
11832	Energetic turtle
11833	돌 무게 재기
11834	홀짝
11835	Skyline
11836	Collider
11837	K-th path
11838	New Year Train
11839	Beautiful row
11840	XOR
11841	Biochips
11842	Ants
11843	Monkey and Apple-trees
11844	Mountain Trek Route
11845	Substrings