ref: AtCoder に登録したら次にやること ～ これだけ解けば十分闘える！過去問精選 10 問 ～
- 01: https://atcoder.jp/contests/abc086/submissions/15218962
- 02: https://atcoder.jp/contests/abc081/submissions/15219445
- 03: https://atcoder.jp/contests/abc081/submissions/15224048
- 04: https://atcoder.jp/contests/abc087/submissions/15221076
- 05: https://atcoder.jp/contests/abc083/submissions/15224114
- 06: https://atcoder.jp/contests/abc088/submissions/15243025
- 07: https://atcoder.jp/contests/abc085/submissions/15243046
- 08: https://atcoder.jp/contests/abc085/submissions/15224157
- 09: https://atcoder.jp/contests/abc049/submissions/15224169
- 10: https://atcoder.jp/contests/abc086/submissions/15224182