摘要：
对于有上下界的网络流来说,我们可以分离出必要弧,然后将必要弧切开,两端分别连接源点和汇点,原图有可行解充要于源点或汇点满流. 这样求下来,只能求出可行流 cpp include include include include include include include using namespa 阅读全文
摘要：
```cpp include include include include include include using namespace std; const int MAXN=5005,MAXM=50005; int init(){ int rv=0,fh=1; char c=getchar( 阅读全文