[graph] Euler circuit

[ei1333]

Description

File Name

src/graph/困った

TODO

• [ ] 実装
• [ ] ドキュメント作成
• [ ] unit-test
• [ ] verify

note

• reference material
  • https://kokiymgch.hatenablog.com/entry/2017/12/07/193238
• implementation
  • う
• 関連 issue / PR

  • 204

• verify:
  • https://yukicoder.me/problems/no/583 (undirected)
  • https://onlinejudge.u-aizu.ac.jp/challenges/search/volumes/0225