AtCoder ABC 215 D
題目連結：AtCoder Beginner Contest 215: D – Coprime 2 … 閱讀全文
ABC
AtCoder ABC 215 C
題目連結：AtCoder Beginner Contest 215: C – One More a … 閱讀全文
AtCoder ABC 215 B
題目連結：AtCoder Beginner Contest 215: B – log2(N) 題目 … 閱讀全文
AtCoder ABC 215 A
題目連結：AtCoder Beginner Contest 215: A – Your First … 閱讀全文