# hdu 3820 Golden Eggs 题解【网络流】【最小点权独立集】

Problem Description There is a grid with N rows and M columns. In each cell you can choose to put a golden or silver egg in it, or just leave it empty. If you put an egg in the cell, you wi...

# 洛谷 P3119 [USACO15JAN]草鉴定Grass Cownoisseur 题解【tarjan】【SPFA】

Description In an effort to better manage the grazing patterns of his cows, Farmer John has installed one-way cow paths all over his farm. The farm consists of N fields, conveniently number...