[일기] 1/2 Codeforces

[즈우북(14.40)]

https://codeforces.com/problemset/problem/514/C

https://codeforces.com/problemset/problem/552/D

https://codeforces.com/problemset/problem/557/C

https://codeforces.com/problemset/problem/830/A

점심 시간에 세 문제 조지고 퇴근하고 한문제 더 하고 땡