DinicはO(V^2E)
https://en.wikipedia.org/wiki/Maximum_flow_problem#Solutions
https://qiita.com/SaitoTsutomu/items/80e70da6717acacefa00 networkx
https://www.hamayanhamayan.com/entry/2017/05/09/120217 LP双対? 燃やす埋める
https://ikatakos.com/pot/programming_algorithm/graph_theory/maximum_flow Ford-Fulkerson Dinic