number theory 4 유클리드 호제법 (Euclidean algorithm) Nov 22, 2022 [BOJ] 링 - 3036 (S4) Nov 22, 2022 [BOJ] 약수 - 1037 (B1) Nov 15, 2022 [BOJ] 30 - 10610 (S5) Feb 4, 2022