mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
129 lines
2.8 KiB
C++
129 lines
2.8 KiB
C++
#include<iostream>
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#include<memory.h>
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#include<string>
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#include<cstdio>
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#include<algorithm>
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#include<math.h>
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#include<stack>
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#include<queue>
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using namespace std;
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const int MAX=205;
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const int inf=999999;
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struct node
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{
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int v,c,next;
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}g[MAX*MAX];
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int adj[MAX],dis[MAX],cur[MAX],num[MAX],pre[MAX];
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int n,m,e,s,t,vn,S,H;
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void add(int u,int v,int c)
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{
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g[e].v=v; g[e].c=c; g[e].next=adj[u]; adj[u]=e++;
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g[e].v=u; g[e].c=0; g[e].next=adj[v]; adj[v]=e++;
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}
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int sap()
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{
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int i,u,v,flag,aug=inf+1,flow=0;
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for(i=0;i<=vn;i++)
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{
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cur[i]=adj[i];
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num[i]=dis[i]=0;
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}
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num[0]=vn;
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pre[s]=u=s;
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while(dis[s]<vn)
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{
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flag=0;
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for(i=adj[u];i!=-1;i=g[i].next)
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{
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v=g[i].v;
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if(g[i].c&&dis[u]==dis[v]+1)
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{
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flag=1;
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aug=min(aug,g[i].c);
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pre[v]=u;
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cur[u]=i;
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u=v;
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if(u==t)
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{
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flow+=aug;
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while(u!=s)
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{
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u=pre[u];
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g[cur[u]].c-=aug;
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g[cur[u]^1].c+=aug;
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}
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aug=inf+1;
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}
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break;
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}
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}
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if(flag)
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continue;
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if(--num[dis[u]]==0)
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break;
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for(dis[u]=inf,i=adj[u];i!=-1;i=g[i].next)
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{
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v=g[i].v;
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if(g[i].c&&dis[v]<dis[u])
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{
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dis[u]=dis[v];
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cur[u]=i;
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}
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}
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dis[u]++;
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num[dis[u]]++;
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u=pre[u];
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}
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return flow;
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}
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int main()
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{
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int i,j,k,T;
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scanf("%d",&T);
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while(T--)
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{
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scanf("%d%d%d%d",&n,&m,&S,&H);
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e=0;
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vn=2*n+2;
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s=S+n;
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t=H;
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memset(adj,-1,sizeof(adj));
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add(s,S,inf);
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add(H+n,T,inf);
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for(i=1;i<=n;i++)
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{
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scanf("%d",&k);
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if(i!=S&&i!=H)
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{
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add(i,i+n,k);
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}
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else
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{
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add(i,i+n,inf);
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}
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}
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while(m--)
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{
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scanf("%d%d",&i,&j);
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if(i!=s&&j!=t)
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{
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add(i+n,j,inf);
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add(j+n,i,inf);
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}
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else
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{
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if(i==s)
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{
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add(s,j,inf);
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}
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else
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{
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add(i+n,t,inf);
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}
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}
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}
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printf("%d\n",sap());
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}
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return 0;
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}
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