# AtCoder Beginner Contest ###### tags: `競技プログラミング` ## ABC 145 ### AC A - Circle B - Echo ## ABC 144 ### AC A - 9x9 B - 81 C - Walk on Multiplication Table ## Atcoder 精選10問 ### AC 1. ABC 086 A - Product (100 点) 2. ABC 081 A - Placing Marbles (100 点) 3. ABC 081 B - Shift Only (200 点) 4. ABC 087 B - Coins (200 点) 5. ABC 083 B - Some Sums (200 点) 6. ABC 088 B - Card Game for Two (200 点) 7. ABC 085 B - Kagami Mochi (200 点) 8. ABC 085 C - Otoshidama (300 点)