Hi.
I did some testing using my own randomly generated IO, but was looking for a hosted one to be sure. If you happen to know of any classical weighted assignment problems/min-cost max-flow problems in an OJ, please let me know in the comments.
So far I know about this one: https://www.spoj.com/problems/BABY/
Best.
To test my implementation, I used SWERC 2017 — G: Cordon Bleu
Two problems from codeforces that I've solved using MCMF: https://codeforces.me/problemset/problem/237/E https://codeforces.me/problemset/problem/277/E
From Kattis: https://open.kattis.com/problems/mincostmaxflow
Kattis — Cordon Bleu
Kattis — Raging River
Kattis — Mission Improbable
Kattis — Aqueduct Construction
Kattis — Hexagon
Kattis — Min Cost Max Flow