109 lines
1.9 KiB
C++
109 lines
1.9 KiB
C++
#include <stdio.h>
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#include <string.h>
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#include <iostream>
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using namespace std;
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const int N=5005;
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const int M=1000001;
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const int inf=1<<30;
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int cnt,n,m,s,t;
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int head[N];
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int NN;
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struct Edge
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{
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int v,next,w;
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}edge[M];
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void addedge(int u,int v,int w)
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{
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edge[cnt].v=v;
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edge[cnt].w=w;
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edge[cnt].next=head[u];
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head[u]=cnt++;
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edge[cnt].v=u;
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edge[cnt].w=0;
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edge[cnt].next=head[v];
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head[v]=cnt++;
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}
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int sap()
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{
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int pre[N],cur[N],dis[N],gap[N];
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int flow=0,aug=inf,u;
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bool flag;
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for(int i=1;i<=NN;i++)
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{
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cur[i]=head[i];
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gap[i]=dis[i]=0;
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}
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gap[s]=NN;
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u=pre[s]=s;
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while(dis[s]<NN)
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{
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flag=0;
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for(int &j=cur[u];j!=-1;j=edge[j].next)
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{
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int v=edge[j].v;
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if(edge[j].w>0&&dis[u]==dis[v]+1)
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{
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flag=1;
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if(edge[j].w<aug) aug=edge[j].w;
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pre[v]=u;
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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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edge[cur[u]].w-=aug;
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edge[cur[u]^1].w+=aug;
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}
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aug=inf;
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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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int mindis=NN;
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for(int j=head[u];j!=-1;j=edge[j].next)
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{
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int v=edge[j].v;
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if(edge[j].w>0&&dis[v]<mindis)
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{
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mindis=dis[v];
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cur[u]=j;
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}
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}
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if((--gap[dis[u]])==0)
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break;
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gap[dis[u]=mindis+1]++;
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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 A[501],B[501];
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while(scanf("%d%d",&n,&m)!=EOF)
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{
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memset(head,-1,sizeof(head));
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s=0;t=n+1; NN=n+2;
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for(int i=1;i<=n;i++)
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scanf("%d",&A[i]);
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for(int i=1;i<=n;i++)
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scanf("%d",&B[i]);
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for(int i=1;i<=n;i++)
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{
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addedge(0,i,A[i]);
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addedge(i,t,B[i]);
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}
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for(int i=1;i<=m;i++)
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{
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int a,b,c;
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scanf("%d%d%d",&a,&b,&c);
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addedge(a,b,c);
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addedge(b,a,c);
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}
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printf("%d\n",sap());
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}
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}
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