B - 嘘つきの高橋くん | AtCoder Beginner Contest 021 less than 1 minute read B - 嘘つきの高橋くん | AtCoder Beginner Contest 021
A - 足し算 | AtCoder Beginner Contest 021 less than 1 minute read A - 足し算 | AtCoder Beginner Contest 021