最大流
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