很明显是最大权封闭子图(noi挺喜欢考?),但直接跑最小割的话处理不了不能打到的plant,所以要先拓扑排序简化下图

(重建图挺烦。。)

 1 #include<bits/stdc++.h>
 2 #define inc(i,l,r) for(int i=l;i<=r;i++)
 3 #define dec(i,l,r) for(int i=l;i>=r;i--)
 4 #define link(x) for(edge *j=h[x];j;j=j->next)
 5 #define mem(a) memset(a,0,sizeof(a))
 6 #define inf 1e9
 7 #define ll long long
 8 #define succ(x) (1<<x)
 9 #define NM 1000
10 #define nm 1000000
11 using namespace std;
12 int read(){
13     int x=0,f=1;char ch=getchar();
14     while(!isdigit(ch)){if(ch=='-')f=-1;ch=getchar();}
15     while(isdigit(ch))x=x*10+ch-'0',ch=getchar();
16     return x*f;
17 }
18 struct edge{
19     int t,v;
20     edge *next,*rev;
21 }_e[nm],e[nm],*h[NM],*_h[NM],*o=_e,*tmp[NM],*p[NM];
22 void __add(int x,int y){
23     o++;o->t=y;o->next=_h[x];_h[x]=o;
24 }
25 void _add(int x,int y,int v){
26     o++;o->t=y;o->v=v;o->next=h[x];h[x]=o;
27 }
28 void add(int x,int y,int v){
29     _add(x,y,v);_add(y,x,0);
30     h[x]->rev=h[y];h[y]->rev=h[x];
31 }
32 int n,m,b[25][35],_x,_y,_t,_s,v[NM],d[NM],tot,cnt[NM],a[NM];
33 queue<int >q;
34 void bfs(){
35     inc(i,1,tot)if(!v[i])q.push(i);
36     while(!q.empty()){
37         int t=q.front();q.pop();
38         for(edge *j=_h[t];j;j=j->next)if(v[j->t]){
39             v[j->t]--;
40             if(!v[j->t])q.push(j->t);
41         }
42     }
43 }
44 int maxflow(){
45     int flow=0;edge *j;
46     inc(i,0,n)tmp[i]=h[i];
47     cnt[0]=tot;
48     for(int x=0,s=inf;d[x]<tot;){
49         for(j=tmp[x];j;j=j->next)
50         if(j->v&&d[x]==d[j->t]+1)break;
51         if(j){
52             s=min(s,j->v);tmp[x]=p[j->t]=j;
53             if((x=j->t)==n){
54                 for(;x;x=p[x]->rev->t)
55                 p[x]->v-=s,p[x]->rev->v+=s;
56                 flow+=s;s=inf;
57             }
58         }else{
59             if(!--cnt[d[x]])break;
60             d[x]=tot;
61             link(x)if(j->v&&d[x]>d[j->t]+1)
62             d[x]=d[j->t]+1,tmp[x]=j;
63             if(x)x=p[x]->rev->t;
64         }
65     }
66     return flow;
67 }
68 int main(){
69 //    freopen("data.in","r",stdin);
70     n=read();m=read();
71     inc(i,1,n)
72     inc(j,1,m)b[i][j]=++tot;
73     inc(i,1,n)
74     inc(j,1,m){
75         _t=read();
76         a[b[i][j]]=_t;
77         if(_t>0)add(b[i][j],tot+1,_t);
78         if(_t<0)add(0,b[i][j],-_t);
79         _t=read();
80         inc(k,1,_t){
81             _x=read()+1;_y=read()+1;
82             __add(b[i][j],b[_x][_y]);v[b[_x][_y]]++;
83         }
84         if(j>1)__add(b[i][j],b[i][j-1]),v[b[i][j-1]]++;
85     }
86     bfs();o=e;
87     inc(i,1,tot)if(!v[i]){
88         if(a[i]>0)_s+=a[i];
89         for(edge *j=_h[i];j;j=j->next)if(!v[j->t])add(i,j->t,inf);
90     }
91     n=tot+1;tot=n+1;
92     printf("%d\n",_s-maxflow());
93     return 0;
94 }
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posted on 2016-01-31 16:00  onlyRP  阅读(122)  评论(0编辑  收藏  举报